EcoTech might know the answer. Failing that, the backup runs the pump using 12 volts as opposed to 24 volts on normal power. An MP40 supposedly uses 40 watts at maximum power with the 24 volt power supply. On backup it would probably use maximum 20 watts. Apply Ohm's law to those numbers & you should get a ballpark number for fuse amperage. Keep in mind that a 12 volt battery will be charged with a supply of up to 14.5 volts. So a fuse with slightly higher amperage than the charging current should do the trick. I'll let you look up Ohm's law & do the math. Or what the hey, here. P=EI, where P is power in watts, E is voltage & I is current/amps.
Last edited by mike31154; 03-15-2014 at 03:30 AM.
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