Posted By scottishjohn on 07 Oct 2018 08:44 AM
same in UK you only get production cost --average price to buy kw =£0.17--you get FIT (feed in tariff) up to 4kw array, used to be 0.41 in 2002 -now with drop in solar pv costs its 0.07.takes on average 7years to pay back installation if you include the RHI grant ,and that is paid over 6 years,so it still takes 7 years to start making money ,provided you dont, have to replace an invertor --so yes use it all if you can ,then its worth 0.17+0.07=£0.24--not sure its right time to buy battery system yet, still expensive for amount they can store.heating water is better done with soar thermal -thats a no brainer.PV is not good for resistive loads like water heaters
Honestly, I don't think I'd consider going solar PV WITHOUT an on-premises battery system these days.
Yes, it's stacking cost on top of the array, pushing out the payback.
But basic grid-tie systems don't protect you if the grid goes down. The safety equipment takes down your array when grid power goes down so that someone working on lines won't get blasted.