How to run something that is not 12volts off 12v battery?

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Old 05-08-16, 02:06 AM
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How to run something that is not 12volts off 12v battery?

Hey, New here and just looking for some advice.

I am trying to setup a solar panel to charge a 12v battery to run a few devices.
I have managed to get the panel and battery wired up and charging.

Now my problem is how to figure out what the device is running at and how to run it off the 12 battery (12V20Ah).

The device is a small water pump used in the garden, and it runs off 4 AA batteries, it has no specifications what so ever so that is all I have. I am gathering that a single AA is 1.5v, so 4 of them makes it 6v. But, I know nothing about amperage and how it affects everything.

I don't know what else to say, but if I have left something out let me know.

Thanks
 
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Old 05-08-16, 02:14 AM
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You need a DC to DC voltage converter. Example: Amazon.com: SMAKN Dc/dc Converter 12v Step Down to 6V/3A Power Supply Module: Electronics A device that uses AA bateries almost certainly draws less than one amp.
 
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Old 05-08-16, 05:10 AM
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What type of batteries specifically are you using in the pump? How long does the pump run continuously before the batteries are dead? With that info we can make some guesses as to its current draw.
 
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Old 05-08-16, 11:01 AM
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If the pump runs on AA batteries then it must be a very low current draw.
Probably around 150ma-200ma or .15a-.2a or 1/5 of an amp.
 
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Old 05-09-16, 07:00 AM
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I could not tell you how long the batteries last. I am using 4 * 1.2v, 2550mAh , Ni-MH High Capacity rechargeable battery. But ,I have used 1.5v non rechargeable batteries as well.

Cheers
 
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