Reviewed September 2026.
A useful commercial solar model makes its assumptions visible. There is no universal payback period or guaranteed return for every business.
Define the investment
Include equipment, engineering, construction, interconnection, financing, operating costs, and likely replacement costs over the analysis period. Identify ownership and which party receives each benefit.
Estimate annual financial benefit
Model production against the actual tariff and operating schedule. Separate avoided electricity purchases, eligible export credits, and approved program payments. Net metering is a billing mechanism, not energy stored in the grid.
Keep the measures distinct
Simple payback divides the initial net investment by an assumed annual net benefit. For illustration only, a $20,000 net investment and a constant $3,000 annual net benefit produce a simple payback of about 6.7 years. That is not a BD quote or a guaranteed outcome, and it ignores financing, changing cash flows, and the time value of money.
A fuller comparison uses cash flows across the project life, with clearly stated assumptions for production, rates, maintenance, and equipment replacement. Ask your adviser which return measure is appropriate for your decision.
Verify incentives separately
Read our commercial incentive checklist and confirm tax treatment with your tax adviser. Model a scenario without any unapproved benefit.
Test the assumptions
Compare conservative and expected production, different electricity-rate paths, and future operating changes. Review roof condition and electrical scope before relying on a preliminary estimate.
Request an assessment with BD Electrical & Solar. Tell us about your property, existing equipment, and priorities so we can define the appropriate scope.