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High power supply ratings are probably less important than the size of the cable feeding the power. Ohms law is very unforgiving at low voltages and high currents, fractions of an ohm of resistance in your leads equate to serious voltage drops with any significant current. A current draw of 12 amps with 0.1 ohm of resistance in your feed cable (and associated connectors) equates to 1.2 volts drop, .2 ohm and your down by 2.4 volts.
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