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Portable batteries you can top up from the sun — for camping, power cuts and off-grid life.

A portable power station is a big rechargeable battery with normal three-pin sockets, USB ports and a 12V output. Pair one with a folding solar panel and you have a 'solar generator' — silent, fume-free power for a campsite, a caravan, a market stall or a winter power cut.

Keep phones, tablets and cameras charged off-grid — the honest version, without the marketing.

Solar power banks and folding solar chargers promise free power from daylight. Some deliver; many are sold on a spec that quietly ignores how weak a pocket-sized panel really is. The difference between a genuinely useful charger and a gimmick is almost entirely down to panel area.

See exactly what your home is using — and find the appliances quietly draining your bills.

A home energy monitor shows your electricity use in real time, in pounds and pence or in watts. Whole-home monitors clamp onto your incoming supply; plug-in meters measure a single appliance; and your supplier's in-home display shows smart-meter data for free.

Fairy lights, stake spotlights, wall lights and lanterns that actually last past October.

Solar garden lighting is the biggest, most crowded corner of the solar-gadget world — and the one with the widest quality gap. A good set runs for years on warm, reliable light; a cheap one fades to a dim blue glow by its second winter.