Hello. I bought a cabin in Montana with no possibility of grid electricity. The previous owner built the place and wired the cabin and barn. She ran it off a 7000 watt Honda generator when needed, but mostly lived without electricity. I want to install solar to run most things and leave the generator as a backup. I ran through several calculators and came up with a max 7kWh per day in the summer and less in the winter. I ordered forty 250W used panels from SanTan solar. (I figured I could use any spares for other projects). These are rated for 30.3V at 8.27A, but I assume reality will be somewhat less given they are used and I am in Montana. There is a breaker panel(Attached) and it is wired from the Generator with Split Phase 220.
1. How many panels should I mount? I was thinking 20, but I am unsure how to calculate overpaneling due to Latitude and older panels?
2. All in one system? Growatt 2x4500W split phase package or MPP 6048 6Kw.
3. Batteries - I will not need a ton of night or low sunshine power and I can run the generator if needed, so I was going to spend the most on the All-in-one and build up batteries over time, but I want good ones. IF I have $2000 for batteries to start, what would you recommend, given that I will add to it next year to get to a total of 21KwH of storage.
Thanks everyone.
1. How many panels should I mount? I was thinking 20, but I am unsure how to calculate overpaneling due to Latitude and older panels?
2. All in one system? Growatt 2x4500W split phase package or MPP 6048 6Kw.
3. Batteries - I will not need a ton of night or low sunshine power and I can run the generator if needed, so I was going to spend the most on the All-in-one and build up batteries over time, but I want good ones. IF I have $2000 for batteries to start, what would you recommend, given that I will add to it next year to get to a total of 21KwH of storage.
Thanks everyone.