[Pontiac]

My guess is he has $15,000 into the system.

That seems like a pretty low ball figure unless he installed it all 20 years ago.

I would expect a system you describe to take a house off the grid to run around $50 to 75,000 if you do much of the work yourself and around $100,000 if you hire it out.

[mad_as_he$$]

Inverter $3,000??, Batteries $1,000?? Solar panels ??? He did all the wiring himself. i am familiar with a small system for a cabin that ran about $5.000 10 years ago.