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I'm in Eversource/NH country where net metering is not quite 1:1 and I'm trying to figure out whether self-powered makes monetary sense. The only difference in net metering is the distribution charge, where I pay $0.04508/kWh from the grid and get a credit of $0.01127/kWh to the grid. So, if I'm calculating correctly, if I send then use 1mW to/from the grid, I will be at a loss of $33.81.
Now, if the PWs are in self-powered mode, which has a 10% loss, then for 1mW use, I'd need an extra 100kW from the grid. At a cost (including all kWh charges) of $0.16312/kWh, that would mean a loss of $16.312.
Do these calculations look correct? If so, then it seems that running self-powered as much as possible makes sense just looking at $.