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30/4/2012 at 11:06pm
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They use to do ones for cars that u would plug into cigy lighter,so as long as they are about 12v should just be plug and play, try asking a seller on eBay.
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Mark
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30/4/2012 at 11:16pm
Location: Leicestershire
Outfit: Swift Charisma 560 & Vauxhall Omega
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We bought this one recently from Maplins (tho' we paid about £50 as it was reduced http://www.maplin.co.uk/solar-powered-12v-12w-battery-charger-217850?C=73669
We bought it to keep the battery topped up when in storage (and to help when away on rallies). Within a few days our low battery was up to full charge again and I think there is only the alarm that draws on it whilst in storage. My husband rested it on the roof and ran the cable down through the skylight and plugged it into the 12v socket in the caravan. He has since rigged something up on the roof so that the panel is secure, but easily removable for when towing..... although there are instructions on Wizard's website on how to fix them permanently to the roof, but we were happy with the 'easy' option! Haven't tried it on a rally yet (may do this weekend, weather depending) but I see no reason why it won't extend the time the battery stays charged for.
Anyway, it's served its purpose for when in storage and for that we are happy as it otherwise meant buying a new battery and then swapping them over periodically.
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01/5/2012 at 3:54pm
Location: Cambs
Outfit: Tin tent diddy tent BIG tent
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Personally I would look at one of at least 10W as the losses in the cables etc will mean that virtually nothing would get to the battery. However if you go above about 20W you will need to fit a regulator to control the charging. A quick rule of thumb is if you multiply the output of the panel in W by 3.5 then that is about the number of Whr you will get per day on average, assuming the panel is facing south at an optimal angle. In the wintertime it will be less and in the summer more. As Francophile says the very small panels are not much more than toys although they are good for teaching people about PV and its pros and cons.
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'A sure cure for sea-sickness is to sit under a tree'
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01/5/2012 at 5:11pm
Location: North Yorkshire
Outfit: Holi * Perran 4 * Airedale 5
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I use a 13w suitcase solar panel to keep my battery topped up and it does the job well. Got mine from Maplins in the sale last year.
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Helen xx
Mini Mad Mum
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02/5/2012 at 12:26am
Location: Swindon
Outfit: CRV 2.2 + Bailey Pegasus
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I use a small one for storage. Keeps Jack Frosts fingers off me cells. I've made the cables a bit longer and passed them through the grommet in the battery box. When in storage the panel sits on top of the partially closed rooflight blind.
Keeps my battery in good order all through Winter - enough charge in it after a 5 month layup to drive the mover.
Wouldn't recommend it for keeping a battery charged on-site though.
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Topic: small solar panel
