by then you need to replace your inverter and maybe a few other...

by then you need to replace your inverter and maybe a few other things with solar and it again cost you a few more thousand bucks

it not free it maybe a little cheaper than paying thing without solar but for some it may even end up costing more, all depending on how long their solar
last because maintenance and replacement cost start to come into the equation

barter has been around since human walk this earth and we evolve to use money because money is the best exchange medium there is
it impossible to get a fair value for your trade with barter system.

Let say I grow a certain fruit and everyone wants it and they can't get enough of it and it really hard to grow
how much do I swap for someone who grow Lettuces or produce eggs?

the only way to fairly exchange for that is people paying with money depending on supply and demand, more people want than I can supply I can set my price higher and vice versa and I then use that money to exchange for other services again based on supply and demand