New 8.5KW System
We are approaching retirement, and planning on building our retirement home in Eastern WA on 5 acres we own (it already has a well). We will be totally off grid, so I’ve been studying solar energy and this is what I have come up with. I would appreciate any comments, improvements and/or suggestions.
Estimated daily wattage use: 7.9kW – rounded up to 8.5 kW to base my system on
10 Suntech 275W PV
Midnight Classic 150 Charge Controller
Aims 48v/8000W Inverter
16 L16 Trojan 420Ah – set up in 2 48V strings
-or 16 Trojan T105 225Ah – set up in 2 48V strings
Plus: cables, wires, fuses, combiner box, meters, etc.
Now…a couple of questions (beyond the obvious…did I miss something, or figure this out wrong?)…considering these parameters, do I need the 420Ah battery banks, or would I get by with the 225Ah system…or is something in between better? Also, approximately, what should a system like this cost me? I plan to do all the installation.
Any comments would be appreciated. I will not be starting this project until summer, 2016. Bob