Electric Motor

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What size electric motor is needed to bench test a 400 amp, 15 volt alternator?

Building test bench......... want to use single phase electric motor but I don't know how to spec it out.
The alternators will be at least 75% efficient. Don't know the formula to calculate what's needed with losses due to belt slippage, heat, wire resistance and things like that.
Your help is greatly appreciated.

400A @ 15V = 6kVA
if only 75% efficient 8 kVA

Even without belt slips or other losses, that comes to over 10hp.

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