smkettner wrote:
ewarnerusa wrote:
smkettner wrote:
I would reduce the 14.8 down to 14.2 to 14.5 zone.
Why so low? Seems like an appropriately high bulk/absorption voltage is all the rage amongst the solar gurus here.
I was still getting an inverter shut down at 14.7V, so I've dropped it down to 14.65V. I was also wrong about which stock algorithm I had been using, it was the 14.6V one.
I am not sold on the higher voltages unless you have a specific issue to resolve. I am more inclined to leave it lower as long as you are still getting to float by end of day. The periodic equalization can resolve any long term issues. Mine is set at 14.3 and seems to keep the batteries up just fine.
I did not realize the PWM controller had different settings from the MPPT. My MS MPPT also has a programmable cap on voltage.
I'll update this thread as I learn more about how the system is working. When I came home at lunch yesterday (fairly sunny morning) the controller was in float at 13.4V. The batteries were pretty full from the day before already, so no good conclusions on how well the 14.4V setpoint worked for charging depleted batteries.
Regarding the PWM controller settings, it does kind of have a programmable cap on voltage in the HVD that KJINTF has been suggesting. This isolates the controller completely from the batteries as opposed to a simple voltage cap, but it can be programmed to reconnect at any desired voltage as well. I am tempted to try it to see if it clamps the voltage any faster due to the trips I still experience when the inverter has a sudden load drop. But at the same time I don't want to lose my ability to equalize at 15.3V periodically which the controller is setup to automatically do every 28 days.
