pat wrote: have you ever done a costing on what it cost you to produce a kw of electricity takeing into consideration replacement of components
Not specifically, as I have gradually increased the size of my system over the years, changed things about etc, and my first 2 59W panels cost well over $600 each! As a very
rough guide using prices you can find today, and DIY'ing, but ignoring the cost of money and various other accounting type fudges
and just for off-grid vs grid-
6kW PV, ground mount for E and W facing panels $7000
5kW inverter $6000
2 60A MPPT charge controllers $2000
21kWh LiFePO4 battery, BMS etc $15000
Breakers, switches, fuses, cabling etc $2000
2.4kW 240V generator + a bit of fuel, + 40A battery charger $2000
Such a system should be able to easily deliver 20kWh/day on average in a reasonably sunny, not too hot location, for 15 years before anything needs replacing (other than perhaps a few capacitors). Of course it depends on how much of that you actually use, but lets say you use it all
then 20 X 365 X 15 years = ~110MWh output before the battery needs replacing
3500000 cents/ 110000kWh = ~ 32c/kWh $6.40/day, no increases
Peak rates for electricity around here are over 50c now, flat rate ~30c I think, plus there's the standing charge of about $1.50/day, both of which are sure to increase over the next 10 years. If you use the same 20kWh/day @ say 30c, + standing charge, that's $7.50/day, sure to go up a lot
7.50 X 365 * 15 = ~$41000 +
Even if you paid an electrician to do the installation, you'd still be ahead.
Grid connected solar, too many variables with changing FiTs and metering fees etc to think about right now!
Is it by choice to be of grid or a necessity of where you live
Purely by choice, since 1991.