Compare: Solar vs Grid

Estimate your bill if you stay on grid vs if you install solar. Adjust assumptions to match your home and policy (net metering credit).

Usage & Grid

Home usage (kWh/day)

Or import via L link param from loads tools.

Billing cycle (days)

Grid rate ($/kWh)

Rate escalation (%/yr)

Fixed charges ($/mo)

Taxes & fees (%)

Solar System

System size (kW)

Typical home: 4–10 kW.

Installed cost ($/W)

Total installed cost ($)

Overrides $/W if filled.

Incentive / rebate (%)

Peak sun hours (hrs/day)

Performance ratio

Panel degradation (%/yr)

O&M per year (% of initial)

Net metering credit (0–100%)

% of retail rate for exports.

Loan APR (%/yr) [optional]

Loan term (years)

Analysis Horizon

Years

Discount rate (%/yr)

Open Solar ROI →

Share / Save

This page accepts L (base64 of [name,W,hours/day]) to fill daily kWh, and R from the Solar ROI page to prefill solar economics.

Year-1 monthly bill

Grid only → — • With solar → —

Monthly savings → —

Simple payback

—

25-yr total savings

—

NPV @ 5%: — • IRR: —

Year	Prod (kWh)	Rate ($/kWh)	Savings ($)	O&M ($)	Loan ($)	Net Flow ($)	Cumulative ($)
Totals	—		—	—	—	—

Savings limited to your usage if net-metering credit < 100%.