Electrical Calculators

Free tools to help you size your battery system and wiring correctly.

Battery Payoff Battery Sizing Wire Size

Will a Battery Pay Off at YOUR House?

TX avoided-cost rates + state rebate inputs. Reviewed April 27, 2026. The federal Section 25D credit was repealed by the OBBB — this calculator no longer assumes it.

From your electric bill.

If no solar yet, enter 0.

Most home batteries are 5-16 kWh.

Equipment + labor + permit.

CA SGIP: $5K-$16K. NY Storage Block: ~$250/kWh. CT: $200-$300/kWh. CO: ~$2-5K. Texas: $0 — no state rebate exists.

Heads up: the federal Section 25D residential credit (formerly 30%) was terminated by the One Big Beautiful Bill (P.L. 119-21, July 2025) for systems placed in service after Dec 31, 2025. This calculator no longer assumes any federal credit. Full breakdown.

Battery Sizing Calculator

Calculate how much battery capacity you need for 12-hour backup

kWh

Find this on your electric bill under "Total kWh Used"

Wire Size Calculator

Calculate wire gauge per NEC 310.16 (75°C copper)

A
ft