The battery was totally dead this morning (11.4 volts) after about 16 hours powering the freezer. The charge controller indicated the panel was charging the battery for about 4-5 of those hours, but it was extremely cloudy. I turned off the inverter and reconnected the freezer to grid power (it’s nice to have a backup to the backup!) After charging all day today, the battery is up to about 60%. I hope I didn’t do any permanent damage to the battery.
My estimate of the charge time was pretty close, but my estimate of running time for the freezer was pretty far off. I don’t think I calculated any loses from the inverter, which the internet tells me can be 15% or more. It was also a hot day, hotter than when I measured my freezers usage initially, which could have had an impact. Next time I’ll definitely be measuring the total watt hours used (I forgot to hook up the meter) so I can try to estimate what was lost to the inverter.
One more day of charging before I do any more experimenting.