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@berserker Put a voltmeter on the input terminals of your charge controller. If there is battery equivalent voltage at night then you will need to put an on/off control for your pump to keep from draining your batteries over night. Keep in mind the less expensive diaphragm and brushed motors...

All you need is a solar Grundfos pump, it will run off just solar panels, My Grundfos 11 SQF-2 runs on as low as 36 volts dc- 60 Watts, it has a a controller built in. Although that is minimums to operate for the full 13 GPM up to 390 ft head it requires 500 Watts , the thing about this pump is...