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Solar Math Pro

Disclaimer

These calculators estimate solar savings based on publicly available data (DSIRE, NREL PVWatts, EIA utility rates, Lawrence Berkeley National Laboratory Tracking the Sun). They do not constitute installation advice, financial advice, or legal advice on tax credit eligibility. Individual results depend on your specific system, utility territory, and state tax situation. Verify incentive eligibility with your state revenue agency and a licensed installer before signing any solar contract.

No client relationship

Using this site, reading our content, or emailing yourself a calculation result does not create an advisor-client, attorney- client, accountant-client, installer-client, or fiduciary relationship between you and Bedrocka Tools LLC or any of its contributors. We are not your advisor until and unless you sign a written engagement letter with Bedrocka Consulting LLC or another Bedrocka Ventures entity.

Calculator outputs are estimates

Every calculator on this site produces an estimate based on the inputs you provide and the formulas we have coded. Real-world outcomes may differ because of factors we do not capture: your specific roof characteristics and shading, utility interconnection timelines and fees, net metering policy changes after your install date, state incentive program caps and waitlists, regulatory changes that post-date our last review, and facts about your specific system or utility territory that are not reflected in the inputs. Use calculator results to get a defensible planning estimate and to structure your conversations with a licensed installer and financial advisor — not to make final system or financing decisions on their own.

Use at your own risk

You assume full responsibility for any decision you make based on information from this site. We disclaim liability for outcomes that depend on factors outside our control — which, for solar system economics, includes utility rate changes, regulatory shifts, installer pricing, and system performance variation.

Not affiliated with regulatory or government entities

Bedrocka Tools and Solar Math Pro are not affiliated with, endorsed by, or acting on behalf of the Internal Revenue Service (IRS), the U.S. Department of Energy (DOE), the U.S. Energy Information Administration (EIA), the National Renewable Energy Laboratory (NREL), the N.C. Clean Energy Technology Center (DSIRE), or any other regulatory or government entity. Where we cite their publications and guidance, it is as a primary source of public information, nothing more.

Solar-specific caveats

  • State incentive stacking: state solar incentive values, eligibility windows, and program caps change frequently. DSIRE tracks 3,000+ active programs but individual program details can change between our last review and your install date. Verify current program eligibility, caps, and application deadlines directly with your state revenue agency and the DSIRE database at dsireusa.org before signing any contract.
  • §25D legacy claims (2025 filers): IRC §25D expired December 31, 2025. The non-refundable credit is claimed on IRS Form 5695 on your 2025 return. There is no carryforward for §25D — if your credit exceeds your 2025 tax liability, the excess is lost. Verify your system's placed-in-service date and your eligibility with a licensed CPA or Enrolled Agent before filing. This calculator provides a planning estimate; your actual credit depends on your 2025 tax return as filed.
  • Battery storage and IRC §48E: the Clean Electricity Investment Credit (IRC §48E) applies to commercial installations and residential battery-standalone systems placed in service on or after January 1, 2025. Eligibility rules, prevailing wage requirements, and energy community adders under IRC §48E are complex and depend on installation specifics. This calculator models the base credit rate; consult a tax advisor for IRC §48E eligibility determination on your specific system.
  • Lease and PPA modeling: lease escalation clauses, PPA rate structures, and utility interconnection agreements vary by installer and utility. The lease/PPA modeling in this calculator uses typical market parameters; your actual contract terms may differ materially. Read every line of your solar agreement before signing, particularly the escalation clause, early termination provisions, and production guarantee terms.
  • NREL production estimates: NREL PVWatts provides long-run average annual production estimates by ZIP code. Actual production depends on shading, roof pitch, panel orientation, soiling, and system losses that NREL models at default values. Your installer should provide a site-specific production estimate using actual shading analysis.
  • Utility rate modeling: calculators use EIA Form EIA-861 state average rates and a 2.8%/yr historical escalation assumption. Your actual rate, rate structure (tiered vs. TOU), and future escalation may differ. Time-of-use rate arbitrage modeling requires your specific utility TOU schedule.

Contact for corrections

If you find an error in a calculator or in our cited sources, email info@bedrockatools.com. See methodology for our correction policy.