I have 3 12v 5 AH SLA batteries hooked up in series powering a 36v 750W motor, how long will they be able to power the motor?
Fair. With that in mind, aid3n may need to choose a much bigger system for sure.It is well known that motors can take from 4 to 6 times their rated full load current at startup. Under this loading, the battery will essentially be looking at a near dead short for all intents and purposes. High discharge causes high gassing and heat within the battery which, when and if it breaks down will have possible explosive results.
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