Solar & Battery Calculator
Estimate the solar array, battery bank and inverter size for your home, cabin or RV, plus a simple payback estimate. Enter a few numbers and shop matching products from Solar Factory Outlet in Salem, Oregon.
Solar system size calculator
Array size, panel count and yearly production.
Sun hours are estimates based on NREL average peak sun hours by state. Local shading, tilt and orientation change real output.
Battery backup sizing
Pick the loads you want to run during an outage or off grid.
| Appliance | Watts | Qty | Hours/day | Remove |
|---|
Watts are typical values; check appliance labels. Surge assumes motor loads start at about 3x running watts. Inverter continuous includes a 25% margin.
Savings and payback estimate
Simple payback and 25 year savings.
Does not include financing, maintenance, net metering rules or equipment replacement.
LiFePO4 vs lead acid vs AGM
Typical published ranges. Exact figures vary by brand and model.
| Typical value | LiFePO4 (lithium iron phosphate) | Flooded lead acid | AGM |
|---|---|---|---|
| Cycle life | 3,000 to 6,000+ | 300 to 1,000 | 400 to 1,000 |
| Usable depth of discharge | 80% to 100% | about 50% | about 50% |
| Weight per usable kWh | Lightest (roughly 1/3 of lead acid) | Heaviest | Heavy |
| Maintenance | None (built in BMS) | Water topping, equalizing, venting | Low, sealed |
| Round trip efficiency | about 95%+ | about 75% to 85% | about 80% to 85% |
| Upfront cost | Highest | Lowest | Middle |
Check current incentives in your state
Programs change often. Confirm details with the program and a tax professional.
Federal: IRS Residential Clean Energy Credit and ENERGY STAR federal tax credits.
Need help choosing?
Call 971-374-7829 or email sales@solarfactoryoutlet.net
Estimates only. Results are for planning and do not replace a site assessment, system design or professional advice.