12v PSU and 24v PSU

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Old 06-22-2012, 07:14 PM
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Default 12v PSU and 24v PSU

Scenario: Two PSUs are rated equally in everything except one is rated 12v output the other 24v output.

What's the advantage of 24v vs 12v?
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Old 06-22-2012, 09:07 PM
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Only for the chargers (or whatever) that accept 24V input!

In the general case the same power/watts is achieved with half the current/amps. Current is heat, so the power supply and the input side of the charger (or whatever) will typically run a little cooler, and generally with a more stable voltage, better control. The less heat also means better efficiency, less power is wasted as heat. Meaning the amp reduction might be even more than half.

From a practical RC standpoint, many of the big chargers can only achieve full power with 24 to 27V supplies, because of input current limits. Usually more of an issue for the bigger airplane & heli guys, using say 12S lipos for example. Most car/surface stuff is lower cell counts, and tend to be more limited by the chargers current limits rather than power limits.

If your charger handles ~24V input, it is a preferable way to run. How preferable depends on the number of cells in series you are using.
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