How does the California NEM 3.0 Solar & Battery Calculator calculate financial return and payback?

The solver models gross capital expenditure (CapEx), Section 48 Investment Tax Credits (ITC 30%–50%), 5-year MACRS accelerated depreciation, utility demand charge shaving, and levelized cost of energy (LCOE).

Does this calculator account for battery degradation over time?

Yes, it models standardized degradation curves (typically 1.5% to 2.2% annually for LiFePO4 cells) and accounts for battery pack augmentation cycles across a 20-to-25 year lifecycle.

What federal tax credits apply under the Inflation Reduction Act?

Under Section 48 and Section 45Y, qualifying clean energy and battery storage installations unlock a 30% base ITC, plus potential 10% domestic content and 10% energy community bonus adders.

CPUC Net Billing Tariff (NBT) Engineering Model

California NEM 3.0 Solar & Battery Calculator

Under NEM 3.0, solar export credits dropped by ~75%. Pair your solar with battery storage to store cheap afternoon solar energy and discharge during expensive 4-9 PM peak utility rates.

System & Utility Rate Inputs

Select California Utility

Solar Array Size (kW DC)

Battery Storage Capacity (kWh)

All-in System Gross Cost ($)

Federal Tax Credit Included:

Includes 30% Federal Clean Energy Investment Tax Credit (ITC - Section 25D), lowering your net capital expenditure.

Financial Payback Metrics

Net Cost After 30% Tax Credit: $19,600

Estimated Annual Bill Savings: $3,180 / yr

Estimated Payback Period: 6.2 Years

Self-Consumption Ratio: 88% (Battery Paired)

25-Year Cumulative Net Profit: +$67,400

NEM 3.0 Warning:

Installing solar without battery storage in California extends your payback from ~6 years to over 12-14 years because unbuffered solar exported to the grid in midday only earns ~5 to 8 cents/kWh compared to 50+ cents grid peak pricing.

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