Portable power

Battery technology for temporary event power — a practical guide

Battery basics.

Battery power can be clean, quiet, and practical, but the label on the case only tells part of the story. A good specification checks capacity, output, peak loads, charging, operating limits, and transport before the product is chosen.

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Read the spec sheet

Key terms

Portable battery packs, power stations, e-generators, and BESS units are not interchangeable. These are the terms that matter when comparing products.

Capacity

Capacity is usually shown in Wh or kWh. It tells you how much energy is stored, not how much power can be delivered at once. A large capacity battery can still be wrong for a job if the output is too low.

Continuous output

Continuous output is the power a unit can supply steadily. This matters for lighting, tills, small tools, refrigeration, AV, welfare loads, and other equipment that runs for a period of time.

Peak output

Peak output is short-duration support for starting loads or brief demand spikes. It is useful, but it should not be treated as the normal working output of the system.

Usable energy

The full nameplate capacity may not all be available in practice. Battery management, temperature, reserve settings, charge limits, and inverter losses can change usable energy.

Charge rate

Charge rate decides how quickly the battery can be prepared for the next shift. A battery that is easy to move but slow to recharge may need a different operating plan.

Ingress rating

Outdoor temporary power needs weather thinking. IP ratings help describe resistance to dust and water, but the site plan still needs cable protection, safe placement, and sensible exposure control.

Where batteries help

Best uses

Battery systems are strongest where diesel running creates friction: noise-sensitive event areas, indoor-adjacent work, overnight low loads, short mobile tasks, fast deployment, or sites where refuelling and exhaust are difficult. Larger battery energy storage can also work alongside a generator by covering lighter loads and helping with demand peaks.

They are not magic boxes. Heating, cooling, catering, pumps, and refrigeration can require high continuous output or strong start-up support. The answer is to build the load profile first, then decide whether the site needs portable battery power, a diesel generator, an e-generator, or a hybrid design.

Before pricing

Check list

Use this list before asking for pricing. It gives the supplier enough information to avoid a guess based only on product size.

  • What is the highest simultaneous running load?
  • Which items have motors, pumps, compressors, refrigeration, or heating elements?
  • How long must the battery run without charging?
  • Can the battery recharge from grid, generator, vehicle, or solar?
  • Is the work public-facing, indoor-adjacent, quiet-hours, or emissions-sensitive?
  • What transport documents, weight limits, and handling rules apply to the chosen unit?
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Common questions

FAQ

What should I check on a portable battery unit?

Usable capacity (kWh), continuous output, peak output, recharge time, IP rating, and transport weight — you need all of them to match a real load and a real site.

What is the difference between capacity and output?

Capacity (kWh) is how much energy the unit stores; output (kW) is how much it can deliver at once. A load needs both — enough output to start and run the kit, and enough capacity to last the hours.

Can battery units be recharged on site?

Yes — from grid, generator or solar. The charging plan affects how many units you need and the running cost, so it is part of the spec, not an afterthought.

Are batteries safe for indoor or public-adjacent use?

Quality battery units run silent with no exhaust, suiting indoor-adjacent and public areas where a generator cannot go. Check the IP rating for outdoor or wet exposure.