Ring Powersource RINVU300 inverter review

Best price: £34.99| Continuous output: 300W

For mains power on the go, this ticks most of the boxes. It’s keenly priced, and boasts a power switch, overload and low battery cut-outs, plus a USB that works with Apple kit. It breezed through the load test, easily accommodating all five devices. Some people may be put off by the direct battery connection, but it removes any risk of blowing cigar lighter fuses and the leads are usefully long.