My ancient Babylonian 36 volt direct solar to D/C water pump from Dankoff solar days finally died. I’ve used it for more than 15 years, day in day out. I still may try to resurrect it because to replace it new now costs over $1500. Cheaper to convert to A/c.
In this heat, the fish must have fresh water from deep in the lake and oxygen from splash aeration as well as some discharge of their waste from the bottom of their ponds. Thus, I had to rig up a quick fix for water circulation after the demise of the Dankoff work-horse.
I had an old A/C 110 volt pool pump that I hooked up to a 1500 watt inverter powered by a 48 volt battery bank. I just placed the components in hurriedly built, plywood siding boxes and set them on the old concrete pump pad.
Above: Pumping station with charge controller, fused circuit breaker and inverter
Below: back of pumping station
A 5 year old charge controller from a project was lying around, but it was not MPPT technology, so it would not handle 108 volts and 5 amps coming from the solar array. I bought the cheapest MPPT unit I could find, but it died in a day. This one seems to work well and is keeping the batteries fully charged after each day’s 5 hour draw down to run the fish circulation pump. It runs a bulk charge and both a float and absorption charges as needed, keeping the battery at full charge.
Since this rigged up system works pretty well, I’ll take some time later in the fall to build proper boxes and run the wires through proper conduits. All circuits have fused breakers just to say I do normally follow the rules. All boxes are insulated and have reflective foil inside and on top so they are cool and safe since they are well vented.
I’ll put the batteries and components in the barn for winter storage after the fish are removed from their ponds and happy in their greenhouse tubs.Close up of MPPT charge controller.