1.5 to 5 Watts. These lower-wattage chargers are suitable for maintaining the charge of small batteries, such as those in motorcycles. 5 to 10 Watts. Chargers in this range are more versatile and can be used for car batteries, campervans, or boats that might sit idle for long periods. 10 to 20 Watts and above.. Eco-Worthy 12V Portable 10W Solar Panel Battery Maintainer. The best solar battery charger on a budget. Price: £29.99. View Offer. Boasting a very impressive 10 watts and an enviable price tag, this solar car battery charger is a good way of keeping a car battery topped up. While it can only connect via a 12V socket or battery cables, it will.

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So even with the ignition switched off, that pin allows direct access to the battery. All you have to do is place the solar panel on the dashboard or attach it to one of the windows (with the sucker pads provided), then plug the cable into the diagnostic socket. The socket is normally under the facia on the driver's side, although this can vary.. Streetwize 6 Amp Heavy Duty Automatic 12V Battery Charger. 4.200382. (382) £24.00. Add to trolley. Add to wishlist.