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Forum Index : Windmills : charging a 12v batt in a 24V string
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| rgormley Senior Member  Joined: 22/02/2006 Location: AustraliaPosts: 245 |
Hi all, My batt bank is 24v 12v X 2 batts in series (6 Parr strings) Each batt is 50AH so 300AH yes? (6 x 50AH) anyway the question is that my 24v wind turnbine needs a fair bit of wind to charge at a 24v setup so other than making up a cap doubler.... i stuck the mill accross one of the 12 v batss and it is happily putting 3-7 amp average in light winds into the 12v batt The question is will the other batts in the series/parr arrangment absorb the extra charge the one batt is taking or ...or will it stuff the batt or what? Thanks.... 
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| Robb Senior Member Joined: 01/08/2007 Location: AustraliaPosts: 221 |
Useing conventional current flow for the sake of ease here but I think you get the drift. |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5119 |
Yes this is bad. You'll end up overcharging the single battery and draining the battery in series with it. This will damage the batteries if left for two long. I was going to suggest using a 12 to 24v inverter ( available from auto shops for driving trucks lights off a single 12v battery ), but they only supply 24 volts and you need more than that to start charging a 24v battery bank. Maybe someone else has a easy solution. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245 |
ok have swaped the mill back across the 24v bank. thanks....savd my batts i think... i measured the battery in series and was down to 11.2v) and the charging batt was 15.2v |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5119 |
If you can, put a charger across that batery thats a bit low, you need to keep the batteries equalized ( same voltage ). The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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