Delaware solar decisions
Solar Companies in Delaware: A Quote-First Comparison
There is no honest universal “best” installer. The useful comparison is which verified Delaware contractor gives this property the clearest design, cash price, production case and service responsibility.
Updated September 12, 2026 · California Rate Relief is a private solar referral service.
How this comparison works
California Rate Relief does not rank a company because it bought placement or because a brand has many reviews. Verify the contracting entity, normalize at least two written quotes, check who performs and services the work, and compare cash economics before financing.
1. Verify the business that signs the contract
Check the contracting business in Delaware’s public construction-contractor registry. Check the responsible electrical professional separately in the Division of Professional Regulation license lookup, and confirm whether a funding program requires a participating contractor.
Record the legal business name and license number shown on the contract. Confirm insurance, who pulls permits, whether installation is in-house or subcontracted, and who handles a warranty claim after the sale.
2. Compare the same system and bill
Require each company to use the same usage history, roof area and backup goal. For customers of Delmarva Power, Delaware Electric Cooperative and municipal electric systems, the proposal should identify the serving utility and explain imports, exports, fixed charges and the estimated bill that remains.
The Delaware Public Service Commission directs customer-owned Delmarva Power generation to the utility’s interconnection standards. Community solar is a separate subscription with its own bill credit, subscription fee and contract terms. Do not compare it as if equipment were installed on the home.
Put the quotes on the same basis
A smaller monthly payment can hide a longer contract, less equipment or a larger remaining electric bill. Ask each bidder to fill the same gaps.
| Compare | Get it in writing |
|---|---|
| System and output | Same DC system size, module/inverter models and roof layout; monthly production with shading and losses shown. |
| Battery and backup | Usable kWh, continuous output, backed-up circuits, reserve setting and expected replacement costs. |
| Price and scope | Separate solar, battery, roof, panel upgrade, permits and interconnection. Compare cash prices before financing. |
| Utility bill | Same usage history and tariff; separate onsite use, grid imports, export credits and remaining fixed/delivery charges. |
| Contract and service | Who installs and who services it; written coverage by address, insurance, license record, exclusions and warranty claim process. |
| Payment and transfer | Cash, loan, lease or PPA; upfront costs, APR or escalator, total payments, home-sale and end-of-term terms. |
3. Read the payment and transfer terms
Compare the cash price even if you expect to finance. For a loan, record the APR, fees, term and total payments. For a lease or power-purchase agreement, record the starting payment, escalator, purchase options, end-of-term terms and home-sale process. Do not compare only the first monthly payment.
4. Put state-specific promises in writing
Match the registered contractor, responsible electrical professional, equipment, permits, interconnection, incentive paperwork, payment schedule and change-order rules to the written proposal.
Reject verbal promises that do not appear in the contract. Savings, tax, incentive and production claims need the assumptions and responsible party stated clearly.
Our decision rule
A stronger quote is complete enough to audit: it identifies the equipment, system size, cash price, production estimate, utility assumptions, roof and electrical scope, installer, service process and contract exits. Use the Delaware cost guide to calculate the comparable price per watt before choosing.
Want to discuss your solar options?
Send your project details to California Rate Relief. We collect the information for a solar referral; the provider confirms availability, design and price. The calculator and checklist are yours to use without submitting.