Re: Trying to understand my solar water heating system...
Welcome to the forum.
Does it circulate domestic water, and co-mingle water, or does it use a glycol loop wi th a heat exchanger in the tank? Do the collectors have water in them?
Find out as much info as you can and report back. In short, a solar system like this probably circs water, controlled with diffential controller to turn the pump on when there is a diffence in temp. I would first try to pressurize the system, hot wire the pump and see if water circulates. Work through all the potential failure points and test them individually.
Good luck and keep in touch,
Please note, being a moderator does not add any weight to my opinions 300 watts Siemens/BP panels,plus a Sun 90,, making ~400. ~30 amps into Rogue MPT-3024, 450 ah of Trojan T-105, Morningstar ts300 inverter, a Tri-Metric meter.a collection of antique generators, plus 2 Honda eu-1000i's (also a BS2512 IX controller) and assorted other stuff!