Jim, it will be interesting to see what you come up with. Maybe a 12V panel to feed the ff directly and also feed the 12V to a PWM to power the pump. I built a PWM for my 1st bait tank setup and the 12V battery lasts almost as long as running the pump on a 6V battery. I didn't measure how low the 12V battery can go before the PWM quits. pete
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