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Short answer, no. These put out 45 watts, 4 amps peak... Adding a second battery doesn't increase your charging. How many amps does your pump pull?
Stripe is the cathode or negative. Op states to place the stripe towards the charge controller.
I have the same problem...i suspect the inverter portion of the box is always on and may be constantly draining about 10 watts offof the battery. I'm thinking of switching to a $15 charge controller to eliminate this wasteful power loss.