Portable power stations and solar panels: the no-wiring way to use solar

What a power station is, and what it isn’t

A portable power station combines a battery, a charger and an inverter in one case. The inverter turns the battery’s stored energy into normal 230-volt household electricity for its three-pin sockets, and most also have USB-C, USB-A and car-style 12-volt outlets. Manufacturers and shops call them power stations, solar generators, portable batteries or large power banks. They are quite different from a phone power bank: even the smallest holds about ten times as much energy.

Almost all current UK models use LFP (lithium iron phosphate) batteries, which are more stable than older lithium types and are rated for thousands of charges, typically 3,000 to 6,000 before the capacity falls to 70 or 80% of new. See Battery types, cold weather and safety.

A power station is not a petrol generator: it is silent, makes no fumes and can be used indoors. It is also not a home battery: it powers only what is plugged into it, not your home’s wiring.

How it works with solar panels

Every power station in our size guide has a solar input with a built-in charge controller, so a panel plugs straight in, usually through an XT60, Anderson or 8 mm DC connector, often with an MC4 adapter for standard solar cables. There is no separate inverter or controller to buy.

• Folding panels (60 to 400 W) open out like a book, have a stand on the back and pack away into a bag. They are what most people use for camping and gardens.
• Rigid panels (usually 400 W and up) are cheaper per watt and tougher, and suit a frame, shed or garage roof for the larger home-backup units.
• Real-world output is lower than the label. Anker’s UK guide says losses of around 20 to 30% are normal in good sun, and cloud cuts output much further.
• Angle and direction matter. Face the panel south, out of shade. In winter, prop it up steeply, at about 60 degrees: laid flat on the ground in December it makes less than half as much.

Why people choose one: convenience

• No installer, no paperwork: it arrives in a box and works the same day.
• No wiring: nothing is connected to your fuse box, so there are no building-regulations notifications and nothing to tell the network operator.
• Works for renters and flats: nothing is fixed to the building, and it moves with you.
• Backup in a power cut: many units have a UPS (or “pass-through”) mode. Left plugged into the mains with your fridge or router plugged into them, they switch over in about 10 to 20 milliseconds if the power fails.
• Power away from home: camping, caravans, campervans, allotments, garden offices, market stalls and building jobs.
• Works in Northern Ireland, where plug-in solar is not yet permitted, because a stand-alone power station is not connected to the grid.

What it can run, and for how long

Two numbers matter. Capacity (Wh or kWh) is how much energy it holds, which decides how long things run. Output (W) is the most it can supply at once, which decides what it can run at all. Allow about 85% of the capacity as usable, because the inverter loses some energy.

Some smaller units have a boost or “power lifting” mode that runs a kettle or hairdryer at reduced power, so it works, but more slowly. For a medical device such as a CPAP machine, ask the device’s maker which power stations it can be used with.

Charging on cheap overnight electricity

If your tariff has cheaper hours, you can fill the power station then and plug appliances into it at dearer times. You don’t need solar panels to do this, and in winter it is the main way to keep the battery full.

• Economy 7 gives seven hours of cheaper electricity, typically between midnight and 7am, through a two-rate meter. Night rates vary by supplier and region (about 14p per kWh on one large supplier’s standard Economy 7 tariff in London in October 2026), but day rates are higher than on a standard tariff, so Which? says you need to use at least about 30% of your electricity at night for it to pay.
• Smart time-of-use tariffs need a smart meter and vary by supplier. The cheapest overnight rates, such as Octopus Go and Intelligent Octopus Go at around 7.6p to 8.2p, are only for people who charge an electric car at home.
• The price cap: Ofgem’s average rate for October to December 2026 is 26.32p per kWh, and there is no VAT on household electricity in Great Britain from 1 October 2026 to 31 March 2027.

How to charge on a cheap rate, step by step

1. Check your meter and tariff. Economy 7 needs a two-rate meter; smart time-of-use tariffs need a smart meter. Note your cheap rate, normal rate and cheap hours.
2. Work out the saving with the power station planner, allowing about 20% for losses.
3. Charge while you are awake if you can. Many power stations fill from the mains in about an hour, so start at the beginning of the cheap window, and unplug when full.
4. Charge in a safe place (see below).
5. Use the stored power at peak times, usually 4pm to 7pm, by plugging appliances into the power station instead of the wall.

Charging and storing it safely

• Charge on a hard, flat surface where heat can escape, and never cover the unit or its charger.
• Keep it away from exits and escape routes such as hallways and stairs, and out of bedrooms and communal corridors.
• Fit a smoke alarm where you charge; the Scottish Fire and Rescue Service recommends a heat alarm in a garage or kitchen.
• Use the built-in charger or the maker’s own cable, and unplug once it is full.
• If it gets hot, bulges, smells or hisses, unplug it and stop using it.
• Store it somewhere dry and frost-free. Power stations will not charge below about 0 °C, and should not be left in a hot car.

How it compares

A home battery’s installation has 0% VAT until 31 March 2027; a portable power station bought off the shelf has the normal 20% VAT. See Plug-in solar explained and Home batteries.

The rules, and where the lines are

• Stand-alone use needs no permission. A power station that takes power from a socket and supplies its own outlets never feeds your wiring or the grid, so the network connection rules (G98) and plug-in solar registration do not apply.
• It is not plug-in solar. The plug-in solar rules in force since 27 August 2026 cover only solar devices that do not store energy, and the government has said they are not intended to permit battery storage systems or portable generators. A “balcony power station” that pushes electricity back into a wall socket is therefore outside the legal plug-in route in Great Britain.
• Never back-feed your home through a socket. A lead with a plug at each end is dangerous and, in Great Britain, breaks the electricity safety regulations, which require a back-up source to be arranged so it cannot run alongside the grid. Northern Ireland has its own safety regulations, and the danger is the same. To run house circuits in a power cut, have an electrician fit a changeover switch.
• Planning: there is no official guidance saying a panel you set out and put away needs planning permission. If you fix panels permanently on a frame or outbuilding, the normal solar planning rules apply. See Do I need permission?
• Renting: usually fine, because nothing is fixed or wired in. Check your tenancy for rules on balconies and storing batteries. Fixing a panel to a wall or railing usually needs your landlord’s permission under the tenancy, so get it in writing.
• Insurance: there is no specific rule, but check your policy and tell your insurer if you are unsure, especially for a large home-backup unit.
• Flights: power stations with household sockets are too big to fly. Lithium batteries over 160 Wh are not allowed in passenger baggage.

Buying one safely

• Buy from the manufacturer or an established UK retailer, and be wary of unknown brands on online marketplaces.
• Look for UKCA or CE marking and proper UK three-pin sockets. The Office for Product Safety and Standards stopped two power stations at the UK border in 2025 because their sockets were unsafe or live parts could be touched.
• Compare usable capacity, continuous output, surge rating, solar input limit, weight, warranty and cycle rating, not just the headline size. Prices change often and sales are frequent.
• If it is faulty, the Consumer Rights Act 2015 gives you 30 days to reject it for a refund, and a fault that appears within six months is presumed to have been there at delivery.