Size your whole system
Your daily use and your darkest month decide everything. Put them in and you'll get panels, batteries and an inverter, plus a cost range.
With no location, this assumes a dark winter: about 2.3 hours of strong sun a day in the darkest month.
| 31 | Solar panels, 410 W12.7 kW total, sized for your darkest month with 10% to spare |
| 7 | 48V server-rack batteries30.6 kWh stored · about 4.6 kWh usable each |
| 1 | EG4 12000XP (120/240V)Makes 120 and 240 volts for well pumps and big appliances |
Even in your darkest month, the batteries never drop below 61%, and the sun fills them back up every day.
In summer they're full again by 10am, and the extra sun is yours to use.
Starting full at 6pm, the batteries run the night, drop to their lowest around 8am (61%), then the panels make about 22.5 kWh a day in your darkest month against about 20.4 kWh used. After two days they sit at 95%.
Rough one-time cost: $17,500 – $21,500, parts and wiring.
Go deeper: how this works
Panels: daily use ÷ darkest-month sun hours ÷ 0.77 (wires, heat, dust) × 1.1 (margin).
20.4 ÷ 2.3 ÷ 0.77 × 1.1 = 12.7 kWBatteries: daily use × days without sun ÷ usable storage per battery.
20.4 × 1.5 ÷ 4.6 = 7Want it done for your life?
The guides ask how you live instead of how many kWh, then size everything and show the exact picks.