Storm-prep fit-test

Tell us what you need to power and how long. We'll size the math, then rank the catalog by capacity fit, surge headroom, cycle life, and price.

Loads

Cycle-averaged wattages — for example, a fridge averages ~70W even though the compressor pulls 600W intermittently.

Continuous draw (sum of non-occasional)215W

Autonomy (hours)

How many hours of backup do you need? 48 = 2 days; 72 = 3 days.

Solar input assumed (W)

Total panel wattage you'll deploy. 0 = no solar offset.

Sun hours per day

Average daily sun hours for your location. 5–6 is typical for southern US in summer.

Reserve buffer (%)

Safety margin above computed need. 20% is conservative; 0% is tight.

Budget max ($)

0 to skip; otherwise we filter to fit your budget.

Chemistry

LiFePO4 is indoor-safe + 3,500+ cycles. NMC is lighter but riskier indoors.

Design min temperature (°C)

Lowest expected ambient temp — used for cold-Voc derate when sizing solar. -3.9°C ≈ 25°F.