PV could be solar irradiance in watts per square meter. That tends to range from 0 - 1200 or so. Maybe someone already brought that up.
I almost always hear that beacon pretty loud on my Kiwi SDR in Wrightwood, CA. http://ak7v.hopto.org:8073/
Thanks for the SDR link!
If the PV reading was irradiance I would think it would continuously report a large positive value during daylight hours regardless of the BAT reading.
What I have observed over the months is PV readings rising in the morning after dawn with a matching rise in BAT numbers up into the low 14’s. After a couple of hours BAT has settled at 13.7 and PV drops to 4 or 5 which could be the idle current of a PWM solar charge controller circuit.
Later in the afternoon the BAT and PV readings rise again as if a lead acid battery is being topped off.
I recall Syfr raised the idea of irradiance before but if I wanted to know battery health I’d measure voltage and current and if possible calculate amp hours in and out of the battery.
Fun stuff!!