Typical costs (parts and wiring)
These come from the same math the guides use: sized for a day and a half without sun, and for your darkest month. Middle-of-the-country example (Missouri: about 3.2 winter sun hours on tilted panels, 1.9 on a flat van roof, NASA data):
| Setup | Daily use | Panels | Batteries | Inverter | One-time cost |
|---|---|---|---|---|---|
| Weekend cabin | 4 kWh | 5 × 410 W | 2 rack batteries | EG4 6000XP | $5,500–7,000 |
| Tiny house | 7 kWh | 8 × 410 W | 3 rack batteries | EG4 6000XP | $7,500–9,000 |
| Off-grid home | 15 kWh | 17 × 410 W | 5 rack batteries | EG4 12000XP | $13,000–16,000 |
| Large home | 25 kWh | 28 × 410 W | 9 rack batteries | EG4 12000XP | $19,500–24,500 |
| Van | 3 kWh | 4 × 200 W (roof limit) | 4 × 12V lithium | Victron | $7,000–9,000 |
| Emergencies | ~2 kWh | 4 folding panels | 1 power station + 1 add-on | built in | $3,500–4,500 |
Why location changes the price
Batteries depend on how much you use. Panels depend on your winter sun. The same 15 kWh home needs about 11 panels in Arizona and about 30 in Washington. Check yours with the winter sun hours tool, or run your own numbers in the sizing calculator.
What changes the total most
- Electric heat and water heating. These can double a system. Wood or propane heat keeps it small.
- Days without sun. Every extra day is more batteries, the priciest part.
- Installing it yourself. A pro install usually runs 1.5–2× the parts cost.
What you get for it
No power bill, no outages, no rate hikes, for as long as the sun comes up. Panels run 30+ years; batteries last well over ten.
Questions people ask
How much does it cost to take a house off-grid with solar?
A typical home using about 15 kWh a day costs roughly $12,500–20,000 in parts and wiring, depending mostly on how much winter sun you get. Professional installation usually adds 50–100%.
What's the most expensive part of an off-grid system?
Usually the batteries. That's why it pays to size panels generously and keep the battery bank sensible.
Can I start small and add later?
Yes. With server-rack batteries and a right-sized inverter, you can add batteries and panels over time.
Get the exact setup
A few taps and you'll know exactly what to buy for your situation.