My 8kW PV system is useless on overcast days. For May, June and July to date my costs for grid power has exceeded my feed-in credit which is currently 20c/kWh. The system helps significantly overall but it is not a replacement for grid power. A 5kW battery and a new Fronius hybrid inverter to handle my 8KW of panels that hasn't been released yet would in fine weather provide for my peak cost evening usage which would save me on average $1.50 per day. No battery + inverter upgrade for me based on current feed-in and peak costs.
MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi
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