Welcome to Winter (Solstice)

"different electrical resistivity" does not equate to being a battery. And that link makes no mention of any battery.

 

It would probably be more useful to compare capacity ratings. Mine is rate 7.0 kW DC, 6.0 kW AC. But I am one of the few who give AC capacity, most just list the DC figure.

For those who must know, my PV modules cover 26 x 1.677 m^2, or 43.6 square meters, not counting the inter-module gaps (1" wide clamps in original field, 0.5" in second field).

I would like to add another 2 to 3 kW-DC, but other activities interfered this year, and the increased frailties of age might keep keep me from ever doing such roof work again.

Today's modules are both larger and higher efficiency than what I have.