How long does a battery generator last?

Usable storage divided by your average draw. A unit holding 30 kWh serving a steady 5 kW load runs roughly six hours before it needs recharging.

Can a battery unit replace a diesel generator?

For quiet, low-emission, shorter or lighter-load work, often yes. For continuous heavy load over days, a hybrid pairing or a diesel genset is still the practical answer.

1 - 300 kWh storage · Stored energy, solar or grid recharge

Solar and battery generator rental

Battery systems are rated in stored energy, not just output. That single difference changes how you plan the job.

Where this category fits

Best uses

Indoor-adjacent, night-time and residential-adjacent work with strict noise limits
Film, exhibition and city-centre sites with emissions restrictions
Long stretches of light load, often paired with a smaller genset

Poor-fit uses

Continuous heavy load over multiple days on batteries alone
Sites with no practical recharge route
Upper floors, turf or decking where the weight is not supported

Typical power range

Systems are rated in both output (kW) and stored energy (kWh), commonly up to a few hundred kWh. Usable capacity is always less than the headline figure, so size against the number the provider will put in writing.

Sizing by energy, not just power

A battery unit has two numbers: how much it can deliver at once (kW) and how much it holds in total (kWh). A load that a diesel unit runs indefinitely will empty a battery in a predictable number of hours.

Work out the average draw across the job, multiply by the hours, and compare against usable capacity — which is always less than the headline figure.

Where they win outright

Indoor-adjacent placement, night work near homes, film sets, exhibition halls and any site with an emissions restriction. There is no exhaust and effectively no engine noise.

They also cover the long stretches of light load where a diesel genset would be running inefficiently.

Hybrid pairing

The common professional setup is a battery unit carrying the base load with a smaller diesel genset cycling on only to recharge it. The engine runs less, quieter and closer to its efficient load band.

Solar arrays extend runtime but rarely carry a working load by themselves in temporary deployments.

Fuel, runtime and refuelling

Runtime is usable kWh divided by your average draw. Work out the average across the whole job, not the peak.

Recharging comes from the grid, a solar array or a paired genset cycling on and off — confirm which is realistic on your site and how long a full recharge takes.

Solar extends runtime but rarely carries a working load by itself in a temporary deployment.

Noise and emissions

No engine, no exhaust and effectively no noise, which is the whole reason to choose this category.

In a hybrid pairing, the genset noise and emissions still apply — but only for the hours it runs to recharge.

Portability, towing and placement

Weight and footprint are the constraints. Check the floor, deck or ground loading before agreeing a position.

Units are usually delivered and positioned by the provider with a forklift or tail lift; confirm the access route and surface.

Delivery, setup, cable and grounding

Ask these before the unit is scheduled. Each one changes either the price or whether the job works at all.

What is the usable capacity, as opposed to nameplate?: Sizing on nameplate kWh is the most common way these jobs run short.
How is it recharged on site and how long does that take?: Recharge time is dead time unless a hybrid pairing covers it.
What is the surge rating for motor starting?: Inverter-based output has a firmer surge ceiling than an engine.
Who positions the unit and what does the surface need to bear?: Weight is often the reason a chosen position does not work.

What to tell the rental provider

Average load and peak load, separately
Total hours the system must cover between recharges
Whether grid power is available for recharging
Placement surface, floor loading and access route
Noise or emissions restrictions that drove the choice

Solar and battery power at a glance
Planning question	What to confirm
How long must it run?	Usable kWh against your average draw
How is it recharged?	Grid, solar array or paired genset
What is the peak load?	Continuous and surge output ratings
Where will it sit?	Weight, footprint and access route

Calculate energy over the whole job, not just peak watts
Ask for usable capacity rather than nameplate capacity
Consider a hybrid pairing for multi-day work
Confirm recharge method and time on site

Don’t

Assume solar panels alone will carry the load
Ignore the weight and footprint on upper floors or turf
Plan a continuous heavy load on batteries alone
Skip the surge rating for motor starting

Common rental mistakes

Sizing on peak watts only
Calculate energy across the job in kWh, then compare against usable capacity.
Using nameplate capacity
Ask for usable capacity in writing.
Assuming solar panels will carry the load
Treat solar as runtime extension and plan a recharge route.
Ignoring weight on upper floors or turf
Confirm loading with the venue or structural contact before delivery.

Carbon monoxide and safe placement

Never run a generator indoors, in a garage, basement, crawl space, tent, trailer or under a covered porch — even with doors and windows open. Exhaust is invisible, odourless and can be fatal within minutes.
Place the unit outdoors on level ground, well away from doors, windows, vents and air intakes, with exhaust directed away from any occupied space. Follow the distance stated in the equipment manual.
Fit a working, battery-backed carbon monoxide alarm in any building or vehicle being powered.
Never plug a generator into a wall outlet or wire it into a building panel. Backfeeding can kill you, your household and utility crews. Any connection to building wiring requires a licensed electrician and a proper transfer device.
Shut the engine down and let it cool before refuelling, and keep fuel away from hot surfaces.

This is educational guidance, not a substitute for the equipment manual, your rental specialist or a licensed professional.

Common questions

Need silent, emission-free temporary power?

Tell us the load, the hours it must cover and the placement. We route it to providers carrying battery and hybrid systems.

Get quiet power quotes Browse local providers

We are a matching and education platform, not an equipment owner. Availability, pricing and specifications come from the rental provider.

Compare with

Every category above is covered by different providers. Tell us about the job and we will pass it to companies that carry this equipment in your area. We do not own equipment and cannot confirm availability ourselves.