Plug-in solar calculator
Pick your city, orientation and kit to see the yearly output, savings and payback.
Your estimate
We have no solar data for this location yet.
- Yearly output
- 830 kWh
- Used in your home
- 430 kWh (52%)
- Savings in the first year
- Enter your electricity price
- Payback
- Enter the kit price
- Savings over 10 years
- Enter your electricity price
- Lost to the inverter limit
- 0%
Show as a table
| Month | Output |
|---|---|
| Jan | 98 kWh |
| Feb | 88 kWh |
| Mar | 81 kWh |
| Apr | 59 kWh |
| May | 40 kWh |
| Jun | 30 kWh |
| Jul | 33 kWh |
| Aug | 51 kWh |
| Sep | 66 kWh |
| Oct | 92 kWh |
| Nov | 95 kWh |
| Dec | 95 kWh |
Rules for your location
California
Takes effect on January 1, 2027
Up to 1,200 W of inverter output per home.
- Certified as a plug-in photovoltaic system by UL or an equivalent nationally recognized testing laboratory, with a certified feature that prevents backfeeding during an outage; meets the National Electrical Code and the California Electrical Code.
- Your utility may ask you to register the kit.
Last verified: October 31, 2026
Which kit size?
The same location and inputs with different panel power, within the legal limit.
| Panel power | Yearly output | Savings in the first year | Payback |
|---|---|---|---|
| 400 W | 410 kWh | — | — |
| 600 W | 620 kWh | — | — |
| 800 W | 830 kWh | — | — |
| 900 W | 930 kWh | — | — |
| 1,200 W | 1,240 kWh | — | — |
| 1,600 W | 1,540 kWh | — | — |
| 2,000 W | 1,750 kWh | — | — |
California
Takes effect on January 1, 2027
Up to 1,200 W of inverter output per home.
- Certified as a plug-in photovoltaic system by UL or an equivalent nationally recognized testing laboratory, with a certified feature that prevents backfeeding during an outage; meets the National Electrical Code and the California Electrical Code.
- Your utility may ask you to register the kit.
Last verified: October 31, 2026
Colorado
In effect since August 12, 2026
Up to 1,920 W of inverter output per home.
- Labeled and listed by a nationally recognized testing laboratory and cannot energize the grid during a power outage. From January 1, 2027, kits over 391 W may only be sold if UL labeled and listed.
- Your utility may ask you to register the kit.
Last verified: October 31, 2026
Connecticut
In effect since October 1, 2026
Up to 1,200 W of inverter output per meter.
- Certified by UL or an equivalent nationally recognized testing laboratory to UL 1741; meets the State Building Code, the National Electrical Code and IEEE 1547, and cannot energize the building's wiring during a power outage.
- No notification to the utility is needed.
Last verified: October 31, 2026
Maryland
In effect since July 1, 2026
Up to 1,200 W of inverter output per meter.
- Certified by UL or an equivalent nationally recognized testing laboratory. Kits of 391 W or less are exempt from listing provisions that would require rewiring.
- You must notify the utility before connecting.
Last verified: October 31, 2026
Maine
In effect since July 29, 2026
Up to 420 W of inverter output per home.
- Listed to UL 3700 or a comparable standard by a nationally recognized testing laboratory, or configured under the National Electrical Code adopted in Maine; inverters shut off within 0.2 seconds of a power loss.
- No notification to the utility is needed.
- You can install the kit yourself.
Last verified: October 31, 2026
New Hampshire
Takes effect on January 1, 2027
Up to 1,200 W of inverter output per meter.
- Certified by a nationally recognized testing laboratory to the national safety standards for distributed energy resources and plug-in solar systems.
- Your utility may ask you to register the kit.
Last verified: October 31, 2026
New Jersey
Takes effect on March 1, 2027
Up to 1,200 W of inverter output per home.
- Listed or certified to UL 3700 or a comparable standard by a nationally recognized testing laboratory; cannot export power during an outage.
- No notification to the utility is needed.
Last verified: October 31, 2026
Utah
In effect since May 7, 2025
Up to 1,200 W of inverter output.
- Certified by UL or an equivalent nationally recognized testing laboratory, meets the current National Electrical Code and cannot energize the building's wiring during a power outage.
- No notification to the utility is needed.
Last verified: October 31, 2026
Virginia
Takes effect on January 1, 2027
Up to 1,200 W of inverter output per home.
- Certified by a nationally recognized testing laboratory and meets the current National Electrical Code; cannot export power during an outage. Kits of 391 W or less are exempt from listing provisions that would require rewiring.
- You must notify the utility before connecting.
Last verified: October 31, 2026
Vermont
In effect since July 1, 2026
Up to 1,200 W of inverter output per meter.
- UL 3700 or an equivalent certification by a nationally recognized testing laboratory; installed and operated in line with IEEE 1547-2018; cannot energize the building's wiring during a power outage.
- No notification to the utility is needed.
Last verified: October 31, 2026
Not yet verified
We have not reviewed the rules in this state yet.