no spread sheets
no running total of energy
just watching for trends and daily increase or decrease
my total daily energy consumption is 2 > 3 times the avg daily solar input, so I'm still using my generator
I won't claim that solar has cut my generator fuel costs 33% , but it has made a recognizable reduction, I'm not calculating fuel costs, but I do record my generator gasoline costs
if we didn't have the electric fridge, I think the 321w of solar would cover 90% of my energy use, the inverter circuit fridge & residential lighting , TV etc.. is 90% or more of our electrical use