In keeping with my revolting machinery- I've got a problem with my greenhouse battery bank.
The greenhouse is powered entirely by solar panels (with diesel backup we rarely use); and of course when off grid, that means a big battery bank. In our case, it's 16 golf cart batteries, hooked up to give nominal 24VDC .
So; here's the problem. We've got chicks in a brooder again, which means a load for a heat lamp all night long. Stressful on the batteries, but well within normal specs.
But- right now, on a sunny day, the voltage on the electric system computer reads 25.6 V - when the sun is shining on the panels. 25-26 volts while charging is good. Actual "full battery" voltage under charge is going to be over 28V. But; if a cloud passes over, and the panels are receiving only partial input- the system voltage (with loads running) drops quickly to: 22.3 V; a very bad number.
Now, I know exactly what that means, and am going to be working on fixing it next time it rains.
But- do YOU know what it means? I think it would be good for you to know. Someday; you may need this information. Allowing the battery bank to continue in this state for very long can drastically harm all the batteries, and cut their capacity and life very seriously.
So. What is the problem? I think I'm going to let answers accumulate for a day before putting them up- so none of your comments will be public until tomorrow. So you can't peek!