Solar freeze?

[ChuckD]

Any chance there's some kind of pressure relief valve that might have frozen open? Or how about a drain-back valve that opens to allow drainage when not in use? It might have frozen open, and then when the pump came on simply stayed open.

Chuck

[mkelley]

Yeah, that could be it -- unfortunately, the solar company that installed the system went out of business six months ago (the company I contacted is carrying the warranty on the panels but knows nothing else about my system) so unless I pay money to have someone look at it I have no real idea.

But I like that theory -- although where the water was coming from seems somewhat unlikely considering it was on the piping on one of the middle panels (I'm far from an expert here, but I wouldn't think anything like those valves would be installed somewhere arbitrarily in the middle sections but perhaps that's *exactly* where it would be installed).

I'm guessing at some point (assuming all stays well in the immediate future) I'll have occasion to have some repair work done and at that time I'll ask whoever knows about these things what could be the case up there. OTOH, perhaps it truly is a leak that is just waiting to happen again...

[JohnT]

My first guess would be similar to the above. You probably have an air bleeder at the top that was either a little sticky from the cold or had water frozen in it already

[Poconos]

Something else to be aware of is that a solar panel can freeze pretty fast. They are designed to be good solar heat absorbers, and therefore become good heat radiators. Quite possibly, looking at a cold clear sky at night, some water froze and when the pump started a chunk of ice jammed the bleed valve. However, I think the ice should have melted pretty quick and let the valve close properly. It is quite possible the panels hit freezing before the temp sensor on the freeze protecton circuit caused the pump to start. I'd just be aware this problem happened once and simply keep watch to see if it happens again.
Al