36vdc power supply


Old 05-23-08, 03:54 PM
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36vdc power supply

I am in need of a 36v DC power supply, maybe 5amp output max. I'd prefer not to spend a small fortune on this.

I thought about running 3 12v batteries in series.
Can I run a 12v trickle charger to each battery, or is that going to try to send the power from the preceding battery through the charger?

Any ideas?
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Old 05-23-08, 04:07 PM
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I had a mil surplus 2200 psi air compressor from a tank that was 24 volts dc.
I used two 12 volt batteries in series and disconnected them to recharge separately.

36 volt chargers are more common than you would think.
We have a few in the hospital I work at for floor scrubbers that run on 3x12v batteries.

Look here.
Old 05-23-08, 05:08 PM
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How much do you want to spend? Here's one rated at 4.2 amperes for less than $20.


Here's another one at 8.5 Amperes but it has a price of $97.


I think if you Google "36 volt dc power supply" (with the quotation marks) you'll get far more possibilities than you care to browse.

As for using three 12 volt batteries in series...you would want to use identical batteries and charge them in a series arrangement. Any other arrangement will have some batteries discharging or charging unequally. If the unequal charge/discharge doesn't bother you then then, yes, you can use three trickle chargers connected to the individual batteries.
Old 05-24-08, 12:07 AM
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I think the one in that first link will do nicely!
I was really expecting to pay more than that.

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