Strawman Posted November 22, 2023 Share Posted November 22, 2023 I'm off grid. I have a couple of panels on 12v leisure batteries. I've been given a new 40v panel so thought I'll need to reduce voltage. But do I? What happens if I put 40v into 12v battery? Cheers Link to comment Share on other sites More sharing options...
SteamyTea Posted November 22, 2023 Share Posted November 22, 2023 It will bubble a lot, get hot, then not last very long. You can get cheap charge controllers. Just one example. https://www.sunstore.co.uk/product/ep-solar-landstar-10a-12v-solar-charge-controller/ Link to comment Share on other sites More sharing options...
RobLe Posted November 22, 2023 Share Posted November 22, 2023 You def need some sort of charge controller, or the batt will die - the cheap ones tend to be PWM only - I think they're fine if the panel is about the right voltage for the battery. MPPT will perhaps double the current (hence power) output from the panel - eg this one: https://uk.renogy.com/renogy-rover-20-amp-mppt-solar-charge-controller/?Rng_ads=03b67fab5b39c2aa&kw=&ad=&gr=&ca=20759790391&pl=ga&gclid=Cj0KCQiA6vaqBhCbARIsACF9M6n-o8GFD95rBOJdUawQzalez1l8EGmQBSzacZ-BLyoECsXhTQDmfC0aAr2iEALw_wcB&gad_source=1 Only you can decide if it's worth the extra money! Link to comment Share on other sites More sharing options...
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