12v Transformer to 12v Rechargeable Battery?


Old 08-19-19, 06:41 AM
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12v Transformer to 12v Rechargeable Battery?

Can I connect a 12v transformer to a 12v rechargeable battery to recharge the battery?
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Old 08-19-19, 06:57 AM
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No, a transformer produces alternating current. You need direct current at the proper voltage to charge a battery. A battery charger is the best/cheapest way to get that, but it can be built using other types of DC power supplies. Some types of batteries also require a charge controller to prevent the battery from overheating and catching fire.
Old 09-27-19, 04:59 PM
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Need help again!

I've tried many configurations since I first posted this. Now I need help on how to connect these wires please?
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Old 09-27-19, 05:34 PM
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Be sure the photocell is a 12vDC unit. Not sure what a "reversed photo cell" is.

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On edit: I was reading that a reversed photocell energizes the circuit in the daytime instead of at night. Is that what you want ? Hard to tell as we don't know what a butterfly is.

Last edited by PJmax; 09-27-19 at 06:13 PM.
Old 10-04-19, 05:09 PM
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My current situation...

Currently, it runs well if the battery(s) do not drain during the nights... Most nights they do drain. I tried a reversed-photocell so that it would be on during the day, and off at night to save the power that was built-up during the day... But it did not work. Help?
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