Balcony Solar & Circuit Safety Workbench US & EU SPEC

Interactive ray-tracing, microinverter AC backfeed, and branch circuit breaker safety simulator for apartment living.

1. Architectural Shading & Solar Ray-Tracing

Irradiance: 840 W/m²
Panel Angle: 30°
Sun Elevation: 55.4°
Overhang Shade: 0% (Full Sun)
Array DC Potential: 739 W
Sunrise (06:00) Solar Time: 12:30 PM Sunset (20:00)

2. Microinverter & Circuit Safety (NEC vs EU)

SAFE 120% NEC
⚡ Backfeed Limit: Fully Compliant

At 800W AC max backfeed on 120V line, injected current is 6.67 Amps. On a 15A breaker, this is well within safe busbar headroom provided non-dedicated branch loads do not exceed wire ratings.

US NEC 705.12(B) 120% Rule: Inverter backfeed + main breaker ≤ 120% of busbar ampacity. Plug-in solar via dedicated GFCI/AFCI outdoor receptacle is recommended.
Inverter AC Output
739 W
Backfeed Current
6.16 A
Clipping Loss
0 W
Self-Consumption
100 %

3. 24-Hour Diurnal Curve & Grid Offset

■ Solar Generation (W) ■ Apartment Baseload (W) ■ Direct Self-Consumed
Est. Daily Generation
3.84 kWh/day
Self-Consumed Yield
2.64 kWh/day
Uncredited Grid Feed-in
1.20 kWh/day
Est. Monthly Bill Savings
$19.40 /mo
Estimated Kit Payback
3.2 years
Electricity Tariff: ¢/kWh | Kit Est. Cost: $750 USD