How much does an 800W–1200W plug-in solar kit save in California?

At California's average electricity rate of $0.42/kWh ($0.58/kWh peak) and 5.6 daily sun hours, an 800W–1200W system with LFP battery storage saves approximately $730 per year.

California Plug-in / Balcony Solar Calculator (1200W 2026 Guide)

2026 Legal Status: Passed Legislature (SB 868 — Awaiting Governor Signature, Sept 2026) · Avg Retail Tariff: $0.42/kWh (Peak: $0.58/kWh)

Interactive 2026 Engineering Tool

Plug-in / Balcony Solar ROI & Self-Consumption Calculator

California SB 868 (Plug and Play Solar Act) + UL 3700 Certification

Solar Array Wattage (W) — Legal Limit: 1200W

400W800 W1,600W

Electricity Rate ($/kWh Peak/Daytime)

Daily Peak Sun Hours (California Avg: 5.6 hrs)

Direct Self-Consumption % (With LFP Battery = 92%, Without Battery = 55%)

35% (No Battery)92%98% (With Smart Battery)

Complete Kit Cost ($)

Apply 30% Federal Clean Energy Tax Credit (IRC §25D — expires Dec 2032)

💰 Your 30% ITC Savings: $0 back on your federal taxes. Effective cost after credit: $0. Adjusted payback: 0 yrs.

Verified Yield & Payback Output

Annual Solar Output

1,380 kWh

Annual Bill Savings

$510/yr

Simple Payback Period

2.5 Years

10-Year Net Profit

$3,800

California Legal Verdict: Passed Legislature (SB 868 — Awaiting Governor Signature, Sept 2026). SB 868 passed the California Legislature in August 2026 to legalize up to 1,200W plug-in solar systems on standard 120V outlets without utility interconnection fees (effective Jan 1, 2027 upon enactment). Under NEM 3.0, combining plug-in solar with a 1.6kWh–2kWh LFP battery avoids exporting at 8¢/kWh and offsets 58¢/kWh evening peak power.