For any useful charge you need a panel of 80watts minimum.
Halfords solar panel review.
Buying a 40 80 or 120w solar panel mounted on the outside top of the roof would be a good solution if you wanted to regularly stay at non ehu sites even a 40w panel is capable of 3amps so would need a regulator.
The ring obd power cable for solar battery maintainers connects your solar panel to your battery via your vehicles obdii port and provides a permanently on link between a solar panel and your battery for long term battery maintenance.
That charging current would barely keep pace with the current requirements of 1 of your led lights in the habitation area.
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Halfords solar battery maintainer 6w extra info helps reduce power drain from onboard electronics.
It just trickle charges the battery to offset the parasitic drain from the vehicle electronics.
The halfords solar maintainer that i use is 6w so it provides a maximum of 0 5amp so unregulated should be fine.
I bought a 2 4watt halfords solar battery maintainer just to keep the starter battery topped up during storage.
Best solar panel manufacturers.
Ring obd power cable for solar battery maintainers.
It is ideal for maintaining 12v batteries in cars motorbikes boats trucks caravans and other applications up to 250ah.
This list is generally applicable to most regions with established solar industries including europe and asia however in japan panasonic has.
The halfords solar battery maintainer 6w is a clean green energy solution wherever you are to keep your battery level topped up.
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That halfords panel is 6watts capacity so under perfect conditions could theoretically produce about 0 4 amps to push back into the leisure battery.