Figure it out:
2days x 4hours/day = 8 hours
WATTS = VOLTS X AMPS
120 watts = 120volts x Xamps, X=1amps
120 watts = 12volts x Xamps, X=10amps
8hours x 10amps = 80 amphours
3 x 80amphours = 240 amphours
YOU SHOULD HAVE A BATTERY SYSTEM OF AT LEAST 240 AMPHOURS.
David/zetron
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