Free solar installation invoice generator
Bill a PV system the way it is sold: dollars per watt, equipment by model and count, electrical and permitting apart, with rebates and deposits credited on the face of the invoice.
Build your solar installation invoice
Prefilled with a residential rooftop install. Replace the system size, equipment and credits, then download.
| Description | Qty | Rate | Amount |
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What is a solar installation invoice?
A solar installation invoice is read by a homeowner, a lender and often a utility or rebate administrator, and each wants a different thing from it. The homeowner wants the total and the credits; the lender wants the system size and the equipment; the rebate administrator wants model numbers, wattage and the installation date.
Systems are sold per watt, so show the arithmetic: nameplate DC size, the per-watt rate and the resulting figure. Then list the equipment underneath — panel model and count, inverter or optimiser model, racking, monitoring — because "8.4 kW system" is not something anyone can verify and a model list is.
Soft costs are a large share of the price and the part customers understand least. Permitting, engineering stamps, interconnection applications, inspection and utility coordination should be visible lines, not absorbed into the per-watt number, or the invoice looks like hardware priced at three times its retail cost.
What to include
Everything below is already in the generator above — this is what each part is for.
System size and per-watt rate
Nameplate DC kW, the contracted dollars per watt, and the resulting system price.
Panels and inverters by model
Manufacturer, model number, count and wattage for panels, and the inverter or optimiser model.
Racking, attachments and BOS
Mounting system, flashings, conduit, disconnects and balance-of-system components.
Electrical work
Main panel work, service upgrades, rapid shutdown and the run to the point of interconnection.
Permits, engineering and inspection
Permit fees at cost, structural or electrical engineering stamps and inspection charges.
Deposits, rebates and credits
Progress payments already made, utility or state rebates assigned, and the remaining balance.
Three steps to a finished PDF
Enter the system and site
Customer, install address, nameplate DC size and the contracted per-watt rate.
List equipment, electrical and soft costs
Panels and inverters by model, racking, electrical work, then permits and engineering at cost.
Credit and download
Apply deposits and assigned rebates as negative lines, then download and send with the commissioning report.
Per-watt pricing, milestones and the tax credit conversation
Bill in milestones, not at the end
A residential install runs weeks from contract to permission to operate, and most of your cost lands early. The standard structure is a deposit at contract, a payment at equipment delivery or install start, and the balance at inspection pass or PTO. Each milestone gets its own invoice referencing the same project number.
Show equipment so the system can be verified
- Panel manufacturer, model, wattage and count — the nameplate size follows from it.
- Inverter or microinverter model and count, with the monitoring platform named.
- Racking system and attachment type, which matters for roof warranty questions.
Keep the federal credit off your invoice
Customers will ask you to show the residential clean energy credit as a discount. Do not. The credit is claimed on their return, against their tax liability, and depends on facts you do not control. State the gross system cost, note that eligibility and amount are between them and their tax preparer, and leave the arithmetic to that preparer. Utility or state rebates that you receive directly are different — those are assigned and shown as credits.
Document the date and the equipment for rebates
Rebate and incentive programs pay against a paper trail: installation date, equipment model numbers, system size and the installer license. An invoice that carries all four gets processed; one that says "solar system installed" comes back with questions and delays the customer's money and your final payment.
Three mistakes that delay payment
Per-watt price with no equipment list
Neither the lender nor the rebate administrator can verify the system. Name the models.
Federal tax credit shown as a discount
It is claimed on the customer's return, not applied by you. Show gross cost and refer them to their preparer.
Permits and engineering hidden in the rate
Soft costs are real and defensible. Buried, they make the hardware look absurdly marked up.