Reddit reviews Reliance Power Parts 13-030 - 30 Amp Golf Cart Voltage Reducer (36v/48v to 12v) - 360 Watts! with Dual Power Source
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12V@30A Voltage ReducerReliance Power Parts: 13-030Works with 36V and 48V applicationsConnects entire battery pack instead of just one battery which improves the life of the battery packIndustry leading design feature BOTH constant and switched 12V outputs
The magic words you're looking for are "golf cart voltage reducer".
Here's one that'll do 30 amps. https://www.amazon.com/Amp-Golf-Cart-Voltage-Reducer/dp/B00DRFFLDG/ref=sr_1_3?ie=UTF8&qid=1466386038&sr=8-3&keywords=36v+voltage+reducer
Here's one that'll only do 10 amps, but much cheaper. https://www.amazon.com/DROK-Waterproof-Converter-Regulator-Transformer/dp/B017SQ2PUG/ref=sr_1_2?ie=UTF8&qid=1466386038&sr=8-2&keywords=36v+voltage+reducer