$/kWh · what grid pays for exported solar (0 = plug-and-play, no export)
Rates effective March 2026. E-TOU-C3 (CleanPowerSF) uses the same schedule but different $/kWh — update above with your actual bill rates. Baseline credit of −$0.0814/kWh applies to first ~6–8 kWh/day and is not modeled here.
📊 Solar Summary
System capacity
1.60kW peak
Annual production
—kWh/yr
Annual solar savings
—/yr
Est. monthly bill
—/mo
Solar covers
—% of bill
Idle draw cost
—/mo
Panel investment
$800
Panel-only payback
—
📂 Import PG&E Usage Data (Green Button XML)▸ expand
Download your usage history from PG&E: Account → Energy Use Details → Download My Data → Green Button Download My Data (XML format, any date range — more data = better averages).
Everything is processed locally in your browser — no data leaves your device.
📄
Click to select Green Button XML — or drag & drop here
PG&E "Download My Data" format · 15-minute or hourly intervals · any date range
Anthropic API Key
Stored only in your browser's localStorage — sent directly to api.anthropic.com, nowhere else.
Get a key at console.anthropic.com ↗
Doesn't look like a valid Anthropic API key (should start with sk-ant-).
📅 Monthly Solar Profile — Noe Valley, SF
Summer season (4PM peak $0.52)Winter season (4PM peak $0.40)
SF fog pattern: Noe Valley sits in the fog shadow of Twin Peaks — noticeably sunnier than the Sunset or Richmond. April and September are the peak months (clearest skies). June Gloom (late-May through mid-July) suppresses production despite long days. The monthly bars above reflect NREL irradiance data scaled to your peak sun hours setting.
Avg % sunny days by month
☀️ Solar & Battery Systems
Add multiple systems to compare — all data saved in your browser
📋 Side-by-Side Comparison
Model notes: Solar savings = directly self-consumed solar at applicable rate (peak or off-peak).
Battery solar value = excess solar stored and discharged at peak rate (upgraded from off-peak or zero for plug-and-play).
Battery grid value = remaining capacity charged from grid at off-peak, discharged at peak (spread).
Monthly irradiance from NREL data for Noe Valley (37.75°N, −122.43°W), scaled to your PSH input.
Degradation (~0.5%/yr), NEM export of excess beyond battery capacity, permits, and install costs not modeled.
Add System
kWh (total nameplate)
% of nameplate (typ. 80–95%)
% (lithium typ. 88–95%)
charge + discharge cycles
Expansion Batteries
Label (optional)
kWh
Cost ($)
Batteries compatible with this inverter/BMS only — not interchangeable across systems