I noticed on my first discharge, it took 2 hours to go from 144 to 130, then only 30 min down to 120 volts..... yeah...falling off a cliff is a good description....Whoops. Discharge #2 turned into a deep discharge on accident.
INSIGHT CHARGE - Citrus/SilverMay 2022 DATE / TIME,VOLTS,AMPS,TEMP (F),NOTES,amps * 100,D(isharge)/C(harge) + R(est) chart length in columns = (hours / 4) + 1 5/2/2022 9:50:00,157.8,0.342,46,REST,34.2 5/2/2022 9:50:00,159.1,0.339,46,CHARGE,33.9 5/2/2022 11:06:00,163.3,0.344,47,34.4 5/2/2022 12:17:00,166.3,0.342,49,34.2 5/2/2...docs.google.com
I left the discharge process in the care of my brilliant grad student daughter. She dutifully logged data all day, and I showed her how to use the pull-chain switch on the discharge load to turn off the lights and change to 25W bulbs when the voltage hit 120V.
The battery lingered for a loonng time over or close to 140V, then tipped over a cliff. In one 85 minute interval, it dropped from 136.5 to 128.2V. In the next 76 minute interval it fell from 128.2 to 30.22V.
At that point my daughter called me for advice. I told her to turn off the light bulbs. Unfortunately, she turned off the grid charger instead of the pull-chain on the discharge load. So over the next 69 minutes the battery dropped from 30.22 to 8.4V, and did so without a cooling fan. Ouch. At least the discharge current was fairly low, and my garage is pretty cool.
So far the battery is recovering well on charge #3.
The good news is that it looks like my battery can hold a nice long steady discharge at a pretty consistent 140V+.