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Use of the product is in an F-450 to charge 2 1x4s lifep04 batteries while the truck is running. I have a hydraulic pump driven by the batteries. It draws approx. 100 amps and may surge higher in an initial start-up. The surge of current causes the unit to fail. I thought it was my wiring the first time so at my expense, purchased a second unit and wired it according to instructions using 2 AWG input to fuse and the. n 1 AWG to the starter battery. The second unit failed also. I have requested a refund for the second unit and will change the review pending the outcome.