The best power solution for UK construction sites depends on grid availability. Sites with grid access should use Battery Energy Storage Systems (BESS) like the Enertainer for up to 90% fuel savings and zero on-site emissions. Sites without grid access benefit from hybrid systems combining batteries with smaller generators, typically reducing fuel consumption by 50-70%.
What Are the Main Construction Site Power Options?
UK construction sites have three main power options: traditional diesel generators, hybrid systems (generator plus battery), and Battery Energy Storage Systems (BESS). The choice depends primarily on grid availability, project duration, and sustainability requirements.
Reliable power is the backbone of every construction project. Whether you're running tower cranes, hoists, welfare facilities, or security systems, getting your power strategy right affects everything from programme delivery to carbon reporting. Get it wrong, and you face costly downtime, compliance failures, and budget overruns.
The UK construction industry's approach to temporary power has transformed dramatically since 2022. Stricter emissions regulations, the removal of red diesel rebates, and growing pressure to meet net-zero commitments have forced a fundamental rethink. The days of simply ordering an oversized diesel generator and forgetting about it are over.
Traditional diesel generators remain the workhorse of the industry. They're well-understood, widely available, and capable of handling virtually any power demand. However, they come with significant fuel costs, emissions, noise, and maintenance requirements.
Hybrid power systems combine a smaller diesel generator with battery storage. The battery handles base loads and short peaks, while the generator kicks in for sustained high-demand periods. This approach dramatically reduces fuel consumption, often by 50-70%.
Battery Energy Storage Systems (BESS) take this further, sometimes eliminating diesel entirely. When connected to a grid supply, a BESS can store energy during off-peak periods and deliver it during high-demand operations. The result can be zero on-site diesel consumption.
The right choice depends on your site's specific circumstances: grid availability, peak power requirements, project duration, location sensitivity, and sustainability targets.
Power Solution Comparison Table
| Factor | Diesel Generator | Hybrid System | BESS |
|---|---|---|---|
| Fuel Savings | 0% (baseline) | 50-70% | Up to 100% |
| On-site Emissions | High | Reduced | Zero (on-site) |
| Noise Level | 65-75 dB(A) | Intermittent | Near-silent |
| Grid Required? | No | No | Recommended |
| Best For | Remote sites, short projects | Variable loads, no grid | Urban sites, sensitive locations |
Q: Can I eliminate diesel completely on my construction site?
A: In some cases, Yes, if you have grid access. The Enertainer BESS can power tower cranes and hoists entirely from a temporary building supply. McGoff Construction achieved zero diesel consumption over 56 weeks on their Manchester project, avoiding 753 tonnes of COâ‚‚ emissions.
How Do Traditional Diesel Generators Work on Construction Sites?
Diesel generators convert fuel into electricity through internal combustion, providing reliable power regardless of grid availability. However, since 2020, all new generators must meet Stage V emissions standards, which require Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) systems. These modern engines perform best at 70-80% load—a threshold most construction sites rarely maintain.
Despite the industry's shift toward cleaner alternatives, diesel generators aren't disappearing. They remain essential for sites without grid access, emergency backup, and situations requiring guaranteed power regardless of conditions. What's changed is how we specify, operate, and regulate them.
Since 2020, all new diesel generators sold in the UK must meet EU Stage V emissions standards—the world's strictest for non-road mobile machinery. Stage V introduced limits on particle number (not just particle mass), effectively mandating Diesel Particulate Filters (DPF) and, for engines above 56kW, Selective Catalytic Reduction (SCR) systems using AdBlue.
These cleaner engines perform excellently when run correctly. The problem is that "correctly" means running at 70-80% load—and most construction sites don't work that way.
What Is Wet Stacking and Why Does It Matter?
Wet stacking occurs when diesel generators run at low loads (below 30%), causing incomplete combustion that leaves unburned fuel in the exhaust system. In Stage V engines with DPF systems, wet stacking can clog filters and trigger emergency shutdowns—causing site blackouts from equipment that's too large, not failing.
Tower cranes illustrate this problem perfectly. A crane might require 200kVA to start a heavy lift but only 40kVA while slewing or during idle periods between lifts. If you size a generator for peak demand, it spends most of its operational life running at just 20% load.
This chronic underloading causes wet stacking—a condition where incomplete combustion leaves unburned fuel accumulating in the exhaust system. In older engines, this was merely inefficient and messy. In Stage V engines, it's potentially catastrophic.
The DPF relies on high exhaust temperatures (above 300°C) to burn off accumulated soot through a process called regeneration. If temperatures stay too low, the filter clogs progressively. Backpressure builds until the engine either enters "limp mode" or shuts down entirely to prevent damage.
The result: a site blackout caused not by equipment failure but by equipment that's too large for the actual load.
Industry data from 2020-2024 shows that hybrid systems reduce generator runtime by approximately 70% and fuel costs by 60-70% compared to conventional setups, primarily by eliminating low-load operation.
How Much Fuel Does a Construction Site Generator Use?
A 100kVA generator consumes approximately 6.5 litres/hour at 25% load, 11.5 litres at 50% load, 16.5 litres at 75% load, and 22 litres at full capacity. A typical construction site with fluctuating loads averaging 60% capacity should expect roughly 13 litres per hour, or around 2,184 litres per standard working week.
Understanding fuel consumption helps with budgeting and carbon reporting. Diesel generators follow predictable consumption patterns based on load:
| Generator Size | 25% Load | 50% Load | 75% Load | 100% Load |
|---|---|---|---|---|
| 100kVA | 6.5 L/hr | 11.5 L/hr | 16.5 L/hr | 22 L/hr |
| 500kVA | 27 L/hr | 53 L/hr | 80 L/hr | 106 L/hr |
For a typical construction site with fluctuating loads averaging around 60% capacity, expect a 100kVA generator to consume roughly 13 litres per hour, or around 3,000 litres over a standard working week. At current diesel prices, that's a significant operating cost before you factor in delivery logistics, tank rental, and the administrative burden of fuel management.
What Are Hybrid Power Systems for Construction?
Hybrid power systems combine a smaller diesel generator with battery storage to dramatically improve efficiency. The battery handles base loads and short peaks silently, while the generator runs only when needed—and crucially, runs at optimal 70-80% load when it does. This approach typically reduces fuel consumption by 50-70% and generator runtime by up to 70%.
Hybrid systems address the fundamental mismatch between construction power demand and diesel engine efficiency. By adding battery storage to a generator setup, they allow the diesel to run only when needed and, crucially, to run at optimal load when it does.
Hybrid solutions take two main forms. Integrated units like the P-Grid from E-Power International (e-powerinternational.com/p-grid) combine battery and generator in a single package. Alternatively, a standalone BESS such as the Enertainer can be paired with a separate diesel or LPG generator to create a modular hybrid setup—this modular approach offers flexibility and is often the most practical solution for UK construction sites.
How Does a Hybrid System Work Step-by-Step?
The operational logic is straightforward:
1. Low-demand periods: During nights, weekends, or quiet phases between lifts, the battery supplies site power silently and emission-free
2. Demand exceeds battery capacity: When demand exceeds the battery's inverter capacity or the state of charge drops to a set threshold, the generator starts automatically
3. Generator runs at optimal load: The generator doesn't just power the current load—it also recharges the battery. This dual duty keeps the engine running at 70-80% load, exactly where it performs best
4. DPF regeneration occurs: Exhaust temperatures stay high enough for proper DPF regeneration, fuel burns completely
5. Generator shuts down: Once the battery reaches target charge, the generator shuts down and the cycle repeats
The result is dramatically reduced generator runtime. Instead of running 24/7 at low load, the generator might run for 4-6 hours daily at optimal efficiency. Fuel consumption drops by 50-70%, and the generator accumulates far fewer service hours over the project duration.
Real-World Performance Data: Industry data from 2020-2024 confirms substantial savings. Controlled comparisons show hybrid systems reducing generator runtime by around 70% and fuel costs by 60-70% compared to conventional setups. When solar panels are added to the mix, fuel reductions can exceed 50% even on sites with significant power demands. The financial case is compelling: higher equipment rental costs are typically more than offset by fuel savings, often within the first month of operation.
How Do I Size a Hybrid Power System?
Hybrid sizing requires analysing your load profile rather than just peak demand. You need to consider three key components: battery capacity (kWh) to cover quiet periods, inverter capacity (kVA) to handle base load spikes, and generator size for sustained high loads plus charging.
Battery capacity (kWh) should cover your quiet periods without needing the generator. If your overnight security, lighting, and welfare load totals 3kW for 12 hours, you need at least 36kWh of usable battery capacity. Most systems are sized with margin, so 50-60kWh would be typical for this scenario.
Inverter capacity (kVA) must handle your highest base load spike. If the welfare cabins simultaneously run kettles, microwaves, and heaters, the inverter must supply that peak without triggering the generator. Under-sizing the inverter causes unnecessary generator starts and negates efficiency gains.
Generator size can often be smaller than in a pure diesel setup because the battery handles short peaks. The generator only needs to supply sustained high loads plus charging capacity. A site that might have required a 250kVA generator could potentially run on a 100kVA unit paired with appropriate battery storage.
How Do Battery Energy Storage Systems (BESS) Work?
Battery Energy Storage Systems are large, containerised battery banks with sophisticated power management designed specifically for construction sites. When connected to a grid supply—even a modest temporary building supply—a BESS stores energy during off-peak periods and delivers it during high-demand operations like crane lifts. The result can be zero on-site diesel consumption.
A BESS unit is essentially a large, containerised battery bank with sophisticated power management. Unlike a simple battery backup, construction-grade BESS systems are engineered for the demanding, dynamic environment of building sites. They're modular, transportable, and equipped with intelligent controls that manage peak shaving, load balancing, and grid interaction.
The Enertainer from AMPD Energy, available through WOLFF Onsite, exemplifies this technology. Designed specifically for construction, it delivers zero tailpipe emissions, significantly reduced noise, and connects via the Enernet platform for real-time monitoring of power consumption and system status.
What Can Charge a Construction BESS?
The key advantage of BESS is charging flexibility:
- Grid connection: Even a modest temporary building supply can charge the battery during off-peak periods for deployment during high-demand operations
- Generator: Where grid isn't available, a small generator charges the battery efficiently at optimal load
- Solar: Increasingly viable for longer projects, solar charging can supplement or replace other sources
When connected to grid power, the economics transform entirely. Grid electricity costs a fraction of diesel per kWh, and the carbon intensity is far lower—approaching zero as the UK grid continues decarbonising.
Key Economic Advantage: Grid electricity costs approximately £0.15-0.25 per kWh compared to £0.40-0.60 per kWh for diesel-generated power. This means a grid-charged BESS can reduce energy costs by 60-75% while eliminating on-site emissions entirely.
The potential of grid-powered BESS is demonstrated dramatically at McGoff Construction's Manchester development.
The Challenge: The original power strategy called for four diesel generators to operate critical lifting equipment—a setup with enormous fuel costs and environmental impact.
The Solution: WOLFF Onsite proposed an alternative: the Enertainer battery energy storage system drawing from a low-voltage temporary building supply. The system required only 30 amps from the available 90-amp supply, yet powered the site's full lifting setup including cranes and hoists.
- 753 tonnes of COâ‚‚ emissions avoided—equivalent to preventing 327,519 car commutes into Manchester
- Zero diesel consumed on site
- Remote monitoring meant no on-site management burden
- Elimination of fuel deliveries reduced traffic disruption and gate congestion
"Without asking WOLFF Onsite for help, we wouldn't have been in a position where we were able to have a positive impact on the environment and a positive impact on the program."
— Darrell Cullen, Senior Project Manager, McGoff Construction
The Challenge: VINCI Building needed to power two tower cranes requiring 460kVA total capacity, but on a hospital site where noise and air quality were particularly sensitive concerns.
The Solution: After evaluating options and visiting an Enertainer installation, VINCI's team conducted a cost-benefit analysis. The conclusion was clear: BESS offered not only environmental benefits but genuine operational advantages for healthcare construction.
The Enertainer was initially paired with a small temporary generator before transitioning to grid connection. The Enernet monitoring platform provided real-time performance data, allowing the site team to track usage and receive status notifications remotely. Over the Christmas period, the system powered aviation lighting seamlessly without intervention.
- 276 tonnes of COâ‚‚ saved—equivalent to 120,044 commutes into Shrewsbury
- Dramatically reduced noise levels near hospital wards
- Fewer fuel deliveries disrupting hospital operations
- Powered aviation lighting over Christmas without intervention
"All in all, it is a very good piece of kit...clean, reliable and cost effective. The Enertainer clearly gave us the financial savings on the fuel, the benefits of noise and less fuel deliveries."
— Simon Baseley, Senior QS, VINCI Building UK
The South Clyde Energy Centre demonstrates the dramatic weekly cost savings achievable with BESS technology.
The Challenge: The site sits on a busy flight path, requiring aircraft warning lights to operate 24/7—even when the crane wasn't working. The traditional approach would have meant running a 500kVA generator continuously, consuming approximately 4,400 litres of diesel weekly at a cost of around £6,160.
The Solution: WOLFF Onsite proposed the Enertainer BESS paired with a smaller 100kVA backup generator. The system eliminated both the oversized generator and the need for a separate Hushpod battery pack for the warning lights.
- 4,000+ litres of diesel saved
- £5,640 in fuel costs avoided
- 10.11 tonnes of COâ‚‚e emissions cut
- £275 Hushpod hire eliminated
For a project running many months, these savings compound dramatically—demonstrating that BESS delivers ROI within weeks, not months.
Case Study: Torsion Achieves BREEAM Compliance in Urban Leeds
Torsion's project demonstrates how BESS solves the specific challenges of urban construction.
The Challenge: The 189-bed student accommodation project sat in a busy student quarter near Leeds city centre. Noise control was critical for neighbour relations, and space for equipment was limited.
The Solution: The compact Enertainer footprint solved the space constraint, while its quiet operation addressed noise concerns. The generator ran for just 4.3 hours per day on average, compared to 24-hour operation with a traditional setup.
- Generator runtime reduced to 4.3 hours/day average (vs 24/7)
- £275/week Hushpod hire eliminated for aircraft warning lights
- No downtime during 500-hour generator service
- Aligned with BREEAM certification and Considerate Constructors Scheme
"We have achieved significant savings on both fuel consumption and noise generation. Given the urban nature of the site, this aligns well with our goals for BREEAM certification and compliance with Considerate Constructors Scheme standards."
— Sam Lisseter, Site Manager, Torsion
The ROI Reality: Why BESS Pays for Itself in Weeks
Across multiple UK projects, BESS typically pays for itself within weeks, not months. The Careys project saved over £5,600 weekly in fuel alone. Even accounting for higher equipment rental rates, net savings are substantial from week one.
Real Project Savings Summary:
| Project | Weekly Saving | COâ‚‚ Impact |
|---|---|---|
| Careys (Glasgow) | £5,640 + £275 Hushpod | 10.11T COâ‚‚e per week |
| McGoff (Manchester) | 100% fuel eliminated | 753T over 56 weeks |
| VINCI (Shrewsbury) | Verified fuel savings | 276T over 88 weeks |
| Torsion (Leeds) | Gen only 4.3 hrs/day | BREEAM aligned |
For a typical site with grid access running a tower crane over a 40-week programme, switching from diesel to BESS can save £150,000-£200,000 in fuel costs while eliminating hundreds of tonnes of carbon emissions. The financial case is now so compelling that sustainability benefits come essentially free.
Are Battery Systems Safe on Construction Sites?
Yes, when properly installed and managed. The National Fire Chiefs Council (NFCC) has issued specific guidance for BESS installations, requiring separation distances from buildings (typically 3+ metres), early warning fire detection, carbon monoxide monitoring, and notification to local Fire and Rescue Services. Reputable BESS suppliers build these safety features into their system design.
The adoption of lithium-ion battery systems introduces new risk management requirements. While BESS technology is mature and safe when properly managed, thermal runaway—where a battery cell enters uncontrolled heating—is a serious hazard requiring specific precautions.
The National Fire Chiefs Council (NFCC) and HSE have issued guidance applicable to construction BESS installations:
Location matters. BESS units should be positioned away from site boundaries, occupied buildings, and escape routes. Unlike diesel generators, which are sometimes placed beneath site offices to save space, battery systems require separation distances (typically 3 metres or more) to prevent fire spread.
Detection is essential. Early warning fire detection and carbon monoxide monitoring can identify off-gassing before thermal runaway fully develops, enabling intervention.
Emergency planning should include sharing details with the local Fire and Rescue Service, including battery chemistry information and isolation procedures.
Reputable BESS suppliers like AMPD (manufacturers of the Enertainer) build these safety considerations into their system design and provide guidance on compliant installation.
What UK Regulations Apply to Construction Site Power?
UK construction sites must comply with multiple regulations: Electricity at Work Regulations 1989 (EAWR) for electrical safety, Stage V emissions standards for new generators, BS 7375 for 110V reduced low voltage systems, and local noise limits under BS 5228. London sites face additional NRMM Low Emission Zone requirements.
UK construction sites operate within a complex regulatory framework covering electrical safety, emissions, and environmental impact. Understanding these requirements is essential for avoiding enforcement action and project delays.
Electrical Safety: The Absolute Duty
The Electricity at Work Regulations 1989 (EAWR) impose absolute duties on construction site operators. Unlike general health and safety legislation requiring risks to be reduced "so far as is reasonably practicable," EAWR demands that electrical systems be constructed, maintained, and used to prevent danger—full stop. Cost and inconvenience are not defences against failure.
HSG141, the HSE's guidance document on electrical safety for construction sites (updated in 2023), translates these duties into practical requirements. The guidance emphasises lifecycle management: identifying buried services before excavation, maintaining exclusion zones around overhead lines, and implementing robust inspection regimes for temporary installations.
What Is the 110V Reduced Low Voltage System?
The 110V Reduced Low Voltage (RLV) system is a UK construction safety standard specified in BS 7375. It uses centre-tap earthed transformers to limit touch voltage to approximately 55V—low enough to prevent fatal electrocution in most circumstances. It's mandatory for all portable tools and temporary lighting on UK construction sites.
A defining feature of UK construction safety is mandatory use of 110V Reduced Low Voltage (RLV) for portable tools and temporary lighting. This system, specified in BS 7375, uses centre-tap earthed transformers to limit touch voltage to approximately 55V—low enough to prevent fatal electrocution in most circumstances.
UK Construction Site Voltage Hierarchy:
- 400V three-phase: High-power plant only—tower cranes, hoists, large pumps
- 230V single-phase: Fixed installations in site offices and welfare only
- 110V RLV: All portable tools, temporary festoon lighting, general access equipment
- 25V/50V SELV: Confined spaces and extreme wet environments
Colour-coded industrial plugs (yellow for 110V, blue for 230V, red for 400V) prevent dangerous misconnection. Understanding these requirements is covered in tower crane training courses.
What Are Stage V Emissions Standards?
Stage V emissions standards, mandatory for all new diesel generators sold in the UK since 2020, are the world's strictest regulations for non-road mobile machinery. Stage V introduced limits on particle number (not just particle mass), effectively mandating Diesel Particulate Filters (DPF) and, for engines above 56kW, Selective Catalytic Reduction (SCR) systems using AdBlue.
What About the London NRMM Low Emission Zone?
Beyond electrical safety, emissions regulations increasingly shape equipment choices. Stage V standards apply to all new generators nationwide, but using these new low-emission generators is mandatory for building sites across Greater London. Non-Compliance Risks: Because the requirements fall under planning legislation, penalties vary depending on the approach taken by each Local Planning Authority. The most common form of penalties are a legal Notice to stop works, land charges, or cost recovery for enforcement activity.
Non-Compliance Risks: Because the requirements fall under planning legislation, penalties vary depending on the approach taken by each Local Planning Authority. The most common form of penalties are a legal Notice to stop works, land charges, or cost recovery for enforcement activity.
| Your Situation | Recommended Solution |
|---|---|
| Urban site with grid access, moderate demand | BESS (Enertainer) — Grid charging keeps costs low, noise/emission benefits satisfy planning |
| Hospital, school, or residential-adjacent site | BESS or Hybrid — Prioritise regardless of cost; reputational benefits outweigh premium |
| Variable demand with significant crane activity | BESS or Hybrid — BESS proven for crane operations; hybrid if no grid access |
| Remote site, no grid, high continuous demand | Hybrid or Diesel — Size carefully to avoid wet stacking; hybrid reduces fuel logistics |
| Project under 30 days, simple requirements | Diesel Generator — May not justify hybrid complexity unless noise-sensitive |
| BREEAM certification or carbon reduction targets | BESS — Regardless of cost comparison; may be contractually mandated |
Q: What noise limits apply to construction site generators?
A: BS 5228 provides the framework for construction noise assessment, with limits varying by area classification. Urban sites typically face thresholds of 70-75 dB(A) at the nearest residential facade during core working hours. Evening and night work faces much stricter limits—often 50-55 dB(A). Section 61 prior consent agreements with local authorities provide legal certainty, documenting agreed working hours, plant specifications, and mitigation measures. For sites where noise is particularly sensitive—hospitals, schools, residential neighbours—the quiet operation of BESS compared to diesel generators can be a decisive advantage.
How Do I Choose Between Generator, Hybrid, and BESS?
Start with grid availability. If you have any grid access—even a modest temporary supply—BESS is typically optimal due to dramatically lower operating costs and zero on-site emissions. Without grid, hybrid systems offer the best balance of reliability and efficiency. Pure diesel is only appropriate for very short projects, or emergency backup requirements, or when there are genuine supply constraints for suitable BESS systems.
With multiple technologies available, selecting the right power solution requires systematic evaluation of your site's specific circumstances.
Key Decision Factors Explained
Grid availability is often decisive. If temporary grid connection is available—even a modest supply—BESS becomes highly attractive. The economics of grid electricity versus diesel are compelling, and the operational simplicity of a grid-charged battery system is hard to beat.
Peak power requirements determine minimum system capacity. Tower cranes, hoists, and welding equipment have significant startup demands that must be accommodated. However, peak demand alone shouldn't drive the decision—load profile matters more.
Load profile analysis reveals whether you need capacity for sustained high loads or just occasional peaks. A site with consistent 100kW demand needs different equipment than one with 20kW baseline and occasional 150kW spikes. Hybrid and BESS systems excel where there's significant difference between average and peak loads.
Project duration affects the payback calculation. Longer projects allow hybrid and BESS investments to deliver greater cumulative savings. However, even relatively short projects can benefit if fuel prices are high or sustainability requirements stringent.
Location sensitivity may override pure economics. Hospital sites, residential areas, city centre locations, and projects with strict planning conditions often require the noise and emission reductions that only BESS can deliver.
Sustainability commitments increasingly drive decisions. BREEAM certification, Considerate Constructors Scheme compliance, and contractual carbon reduction targets may mandate cleaner power solutions regardless of cost comparisons.
Quick Decision Matrix
| Your Situation | Recommended Solution |
|---|---|
| Urban site with grid access, moderate demand | BESS (Enertainer) — Grid charging keeps costs low, noise/emission benefits satisfy planning |
| Hospital, school, or residential-adjacent site | BESS or Hybrid — Quiet operation essential; fuel savings typically offset any rental premium |
| Variable demand with significant crane activity | BESS or Hybrid — BESS proven for crane operations; hybrid if no grid access |
| Remote site, no grid, high continuous demand | Hybrid or Diesel — Size carefully to avoid wet stacking; hybrid reduces fuel logistics |
| Project under 30 days, simple requirements | Diesel Generator — May not justify hybrid complexity unless noise-sensitive |
| BREEAM certification or carbon reduction targets | BESS — Often contractually required; delivers verifiable carbon data via Enernet |
How Does Carbon Reporting Work with Different Power Systems?
Streamlined Energy and Carbon Reporting (SECR) requirements demand detailed carbon accounting. Diesel systems require manual fuel records converted using DEFRA emission factors. BESS and hybrid systems with remote monitoring platforms like the Enernet simplify this process, providing automatic verified consumption data and carbon calculations.
Streamlined Energy and Carbon Reporting (SECR) requirements and contractual obligations increasingly require detailed carbon accounting for construction activities. Accurate fuel consumption records, converted using DEFRA emission factors, form the basis of most site-level reporting.
BESS and hybrid systems with remote monitoring platforms simplify this process, providing verified consumption data and automatic carbon calculations. The Enernet platform used with Enertainer systems, for example, delivers real-time energy transparency that supports both operational optimisation and compliance reporting.
Frequently Asked Questions About Construction Site Power
Q: How much can I save by switching from diesel to BESS?
A: Grid-charged BESS typically reduces energy costs by 60-75% compared to diesel generation. McGoff Construction eliminated 100% of diesel costs over 56 weeks while avoiding 753 tonnes of COâ‚‚ emissions. The exact savings depend on your current fuel consumption, grid tariff rates, and project duration.
Q: What size battery do I need for my construction site?
A: Battery capacity (kWh) should cover your quiet periods without generator support. If your overnight security, lighting, and welfare load totals 3kW for 12 hours, you need at least 36kWh of usable capacity. Most systems are sized with margin—50-60kWh would be typical for this scenario. Contact WOLFF Onsite for a detailed site assessment.
Q: Can BESS power a tower crane?
A: Yes. The Enertainer BESS has powered tower cranes requiring up to 460kVA on projects including VINCI Building's hospital construction. The system handles both the high starting demands of crane lifts and the lower slewing/idle loads efficiently.
Q: What happens if the grid fails while using BESS?
A: BESS units store sufficient energy to continue operations during short grid outages. For longer outages or sites requiring guaranteed continuity, the Enertainer can be paired with a backup generator that charges the battery when needed. This hybrid configuration provides reliability while maintaining efficiency.
Q: How long does it take to see ROI on hybrid or BESS systems?
A: The financial case is compelling: higher equipment rental costs are typically more than offset by fuel savings, often within the first month of operation. For a typical site consuming 3,000 litres of diesel per week, savings of £500-800 weekly are realistic with hybrid systems, meaning payback can occur in weeks rather than months.
Q: Do I need special training to operate BESS equipment?
A: BESS systems like the Enertainer are designed for construction site simplicity. Basic operation requires minimal training—the systems are largely automated with remote monitoring via the Enernet platform. WOLFF Onsite provides commissioning support and operational guidance as part of the rental package.
Next Steps: How to Get Started
Transitioning to more efficient power solutions needn't be complicated. The process typically involves:
Site assessment: Review your project's power requirements, grid availability, duration, and any specific constraints (noise, emissions, space).
Load profiling: Where possible, gather data on actual or expected power consumption patterns rather than relying solely on peak demand estimates.
Option evaluation: Consider the full range of solutions—traditional generator, hybrid, BESS—against your specific circumstances and priorities.
Supplier consultation: Work with experienced providers who can advise on appropriate sizing and configurations. The difference between a well-specified system and a poor one is substantial.
Implementation planning: Coordinate power installation with your site setup programme. Early engagement avoids costly changes later.
Every construction site has different power requirements, and the optimal solution depends on your specific circumstances. Whether you're planning a new project, looking to improve efficiency on an existing site, or need to meet tightened emissions requirements, speaking with specialists can help you identify the best approach.
WOLFF Onsite provides power generation solutions ranging from traditional Stage V generators through hybrid systems to the Enertainer BESS platform. Our team can assess your requirements, recommend appropriate configurations, and support implementation from initial enquiry through project completion.
Ready to Explore Your Options?
Contact our team to discuss your project requirements and discover how modern power solutions can reduce costs, cut emissions, and simplify site operations.
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