Updated October 2026 · UL 3700 · California SB 868 · Utah HB 340 · UK SI 2026/848 G98

2026 Plug-in & Balcony Solar Payback Calculator (US & UK)

Select your state or utility below or adjust the sliders to compare 800W–1,200W UL 3700 / ENA G98 kits with and without LFP battery storage.

Calculate Solar Payback ↓ ⚡ 100A Panel EV Calculator 🔋 Battery TOU Calculator

Plug-in balcony solar system diagram with 800W to 1200W panels, microinverter, LFP battery, and zero-export smart meter — 800W–1,200W UL 3700 / G98 Balcony Solar + LFP Storage Topology

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.

Anker SOLIX $1299