Calculate annual True-Up bills and battery storage ROI under avoided-cost export rates and peak evening Time-of-Use (TOU) tariffs.
Calculate your annual True-Up bill and battery ROI under avoided-cost export rates and peak evening TOU tariffs.
US average is ~28–32 kWh/day (~900 kWh/month)
0 kWh (No Battery) · 13.5 kWh (1 Unit) · 27 kWh (2 Units)
4 PM to 9 PM utility rate (PG&E / SDGE / SCE)
Avoided cost wholesale rate paid for excess day exports
True-Up bill drops from $2,451 (Solar Only) to $1,017 (Solar + Battery).
| Tier / Setup | Solar Array | Storage | Solar Only True-Up | With Battery True-Up | Action |
|---|---|---|---|---|---|
| Modest Home / Starter | 6 kW | 10 kWh | $1,380/yr | $290/yr | Apply |
| Suburban Median (1 Battery) | 8 kW | 13.5 kWh | $1,950/yr | $410/yr | Apply |
| High Consumption + EV | 11 kW | 20 kWh | $2,890/yr | $620/yr | Apply |
| All-Electric Home (2 Powerwalls) | 14 kW | 27 kWh | $3,740/yr | $780/yr | Apply |
Residential battery storage systems of 3 kWh or greater qualify for the 30% Federal Residential Clean Energy Credit, even when installed without new solar panels. Under NEM 3.0, programming your battery inverter for "Self-Supply / Arbitrage" rather than pure backup is essential to maximize payback speed.
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Groundwork decision utilities are built on reproducible formulas and verified empirical benchmarks.
This utility calculates primary outputs by computing the relationship between user input parameters, standardizing baseline costs, and projecting scenarios according to mathematical amortizations and empirical distributions.
All projections are calculated locally in your browser for 100% privacy and zero data harvesting.
The NEM 3.0 Solar Battery Self-Consumption & True-Up Calculator uses empirical formulas and benchmark parameters defined in the Groundwork decision framework. It evaluates user inputs such as Solar array size (kW DC), Battery storage capacity (kWh) to produce instant, verifiable projections.
Yes, Groundwork's NEM 3.0 Solar Battery Self-Consumption & True-Up Calculator is completely free, runs privately in your browser without requiring registration to calculate, and contains no sponsored financial bias.
Yes, you can use the embed code provided at the bottom of the page to host this calculator on your blog or research portal with automatic responsive styling.
For information only — not financial, medical, or legal advice.
NEM 3.0 Solar Battery Self-Consumption & True-Up Calculator — Calculations use publicly available benchmarks and are for education. Verify with a licensed professional. Primary sources: DOE · EPA · EIA.
Groundwork cites energy.gov, epa.gov, eia.gov directly in methodology. No sponsored bias.
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