Solar and Battery Savings Calculator

Size an array against your own usage and see what it saves with and without storage, under NEM 3.0 and real PG&E rates. Add an EV if you have one, or are thinking about one.

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Estimate only. These are planning figures, not a quote, a firm price or an electrical design.

Assumptions used

Electricity used per year
9,000 kWh
What you pay per kilowatt-hour
$0.448
Batteries
1
Array size
6 kW (matched to your usage)
Include an EV
No
Roof age
0 years
Your electricity use

The 12-month total near the bottom of a PG&E bill. Array size is matched to this.

Based on 3CE and PG&E's rates for the standard time-of-use plan (E-TOU-C), current as of March 2026. Use the rate on your own bill if you have it.

The system

Under NEM 3.0 exported power earns far less than power you use yourself, so storage changes the arithmetic more than it used to.

Electric vehicle

An EV is usually the largest load a house adds. Including one sizes the array against it and puts the charging on the night side, where only storage can serve it.

Your roof

Leave at zero to skip the roof assessment.

Savings in year one · With storage
$3,679

Array size: 6 kW (matched to your usage) · CO₂ avoided per year: 1.90 tons

The comparison

With storage (1)

  • Produced per year9,034 kWh
  • Used on site8,185 kWh
  • Exported to the grid240 kWh
  • Installed cost$43,000
  • Simple payback11.7 years
  • Savings over 25 years$201,485
  • If prices rise 3% or 7% a year$133,994 – $232,231
  • Backup run time13 hours
  • Savings in year one$3,679

Without storage

  • Produced per year9,034 kWh
  • Used on site2,710 kWh
  • Exported to the grid6,324 kWh
  • Installed cost$21,000
  • Simple payback13.7 years
  • Savings over 25 years$74,518
  • If prices rise 3% or 7% a year$52,171 – $84,697
  • Backup run time0 hours
  • Savings in year one$1,530

The 25-year figures assume electricity prices rise 6% a year and don't include replacing a battery.

What this could cost per month

What this could cost per month

Your lender sets the rate. GoGreen's participating lenders list APRs from 3.49% to 10.00%, depending on the lender, the term and your credit. Source: GoGreen finance options, checked October 24, 2026.

Enter the APR your lender quoted, from 0 to 30 percent, to see a payment and borrowing costs.

GoGreen Home financing is tied to a qualifying energy-efficiency upgrade — a heat pump, heat-pump water heater, induction cooking, EV charging, or solar with storage. Panel work qualifies when it supports one of those, not on its own.

This estimate uses the rate you enter. It is not an offer. Your lender decides eligibility, the rate and the term.

The link carries the figures you entered, usage included, and no name or address. They sit in the link itself, which your browser does not send to our servers.

What's in this number

Production assumes 5.5 peak sun hours a day and about 75% delivered after losses — roughly 1,500 kWh a year per kilowatt of panels. That follows our September 28, 2026 NREL PVWatts run for a south-facing Santa Cruz roof; your roof and shading can change the result. Savings combine solar used at your retail rate with exports at the NEM 3.0 credit. We assume 90% battery round-trip efficiency, matching the FranklinWH aPower 2 datasheet at beginning of life, 3 kW charge/discharge and 77°F; actual performance varies. An EV, if added, is assumed to charge overnight. The 25-year savings assume 6% annual electricity-price growth, matching the CPUC’s 2025–2028 forecast for PG&E; extending it for 25 years is our scenario. We also show 3% and 7% scenarios. Battery replacement is excluded. Section 25D expired December 31, 2025, so no federal credit is applied here. Costs are planning estimates for a system you own outright — the only kind we install.

What's next?

Schedule a free solar consultation
See what qualifies for GoGreen Home financingRead more about solar and battery backup

About this estimate

Sunrise Electrical Contracting holds California CSLB licence #C10-1097237 (C-10, Electrical).

This is a planning number, not a substitute for a licensed electrician confirming the panel, the service and the utility feed in person.

We work in Santa Cruz County.

To confirm these figures for your home

Call Sunrise at (831) 786-5506 or visit sunriseelectricalcontracting.com