I have 135 watts soar, and two (2) T105 Trojans. If for any reason you have to run the furnace, the fan really raises havoc with the batteries. IThe panel does pretty good if I can get full sun. Later in the year when it starts it's southerly arc, I don't get the full benefit any more, even with the panel tilted.
I don't have an inverter but have thought about one for a long time.
2000 or 3000 watt with 100 amp charger.
I was under the impression if you had the automatic switch over that was all that you needed. You could then go from land line to generator to solar without any worry.
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