More Solar for "Us"
Ok, I went off.the deep end? Bought 3 used 37watt uni-solar panels and a blue sky 2000e controller for the hefty price of $400, They were being listed as 75w panels, they are not The tested open...
Forum Discussion
Hi Salvo,
Gassing may happen as low as 13.8 or as high as 17.8 volts. It is temperature, voltage and current dependent. That is why I want a temperature probe on the battery post. It is unlikely to happen if the current is below the c/20 rate.
Mr Wiz. has 450 amp-hours of battery bank. His gassing current needs to be 22.5 amps. That is more than his panels are likely to produce.
Let's say we have 20 amps @ 14.6 volts going into 200 pounds of lead. That's about 300 watts. That works out to about 1000 BTU's, if 100% of the energy going in is waste heat. That may raise the temperature 5 F internal to the battery. But of course, even worst case that doesn't happen--as Mr. Wiz's current is too low.
Gassing voltages. Scroll down
Gassing may happen as low as 13.8 or as high as 17.8 volts. It is temperature, voltage and current dependent. That is why I want a temperature probe on the battery post. It is unlikely to happen if the current is below the c/20 rate.
Mr Wiz. has 450 amp-hours of battery bank. His gassing current needs to be 22.5 amps. That is more than his panels are likely to produce.
Let's say we have 20 amps @ 14.6 volts going into 200 pounds of lead. That's about 300 watts. That works out to about 1000 BTU's, if 100% of the energy going in is waste heat. That may raise the temperature 5 F internal to the battery. But of course, even worst case that doesn't happen--as Mr. Wiz's current is too low.
Gassing voltages. Scroll down
Salvo wrote:
This indeed is no lab situation. I'm only commenting on what you said. A 14.6V setpoint will boil batteries. Have at it. ;-)
