What an solar invoice is for
An invoice is not a quote with the word changed. It is a payment demand, and it needs the things that actually get you paid: a due date, accepted payment methods, a reference back to the approved quote, and late terms you are prepared to enforce.
For solar installers selling to homeowners and commercial property owners, the invoice is usually the only thing the customer compares side by side against two competitors. It is doing sales work whether you designed it to or not.
The unit that trips this trade up: Solar quotes are compared on price per watt, so the system size in kW DC belongs at the top of the document.
What every solar invoice must have
- An invoice number and issue date, distinct from the quote it came from
- Payment terms and a specific due date, not just "net 30"
- Accepted payment methods and a link or QR code that lets them pay now
- A reference to the approved quote or work order it came from
- Late fee terms, stated before they are needed
What solar installers bill for
These are the lines that show up on most solar invoices, with the unit each is normally priced in. Ranges are illustrative planning figures, not market data — your own costs, region, and margin decide the real number.
| Line item | Unit | Typical range |
|---|---|---|
| Solar modules, supplied and installed | watt DC | $2–$3 |
| Inverter or microinverters | each | $1,200–$4,500 |
| Battery storage | each | $8,000–$18,000 |
| Racking and mounting hardware | each | $800–$3,000 |
| Main panel upgrade (if required) | each | $2,200–$5,500 |
| Permit, plan set, and inspection | each | $500–$2,500 |
| Utility interconnection application | each | $250–$900 |
| Monitoring and commissioning | each | $300–$1,200 |
Typical deposit convention: Deposit at contract, progress payment at install, balance at PTO.
Solar invoice example
A realistic job, priced line by line, with the arithmetic shown the way a customer sees it:
| Description | Qty | Unit price | Line total |
|---|---|---|---|
| 7.2 kW DC modules — supplied and installed | 7,200 | $2.35 | $16,920.00 |
| Microinverters and rapid shutdown | 1 | $2,850.00 | $2,850.00 |
| Racking, flashing and roof penetration seal | 1 | $1,650.00 | $1,650.00 |
| Permit, structural plan set and inspection | 1 | $1,450.00 | $1,450.00 |
| Utility interconnection and PTO coordination | 1 | $650.00 | $650.00 |
| Subtotal | $23,520.00 | ||
| Total | $23,520.00 | ||
Notice that every assumption is a line rather than a conversation. That is the whole difference between an invoice that holds up and one that gets renegotiated in a driveway.
Three mistakes that cost solar installers money
Quoting production as a promise
Estimated annual kWh is a model, not a guarantee. Label it as an estimate on the document, name the assumptions, and never let it read as a warranted number.
Not separating the incentive
Customers hear the net-of-tax-credit price and remember it as the price. Show gross system price, then the incentive as separate information, and state plainly that eligibility is between them and their tax advisor.
Silence on interconnection timing
Permission to operate is the utility's schedule, not yours. A solar quote that implies a completion date without naming the PTO dependency creates an angry customer sitting next to a dark array.
How to send an solar invoice in about a minute
A template is only half the job — the invoice still has to reach the customer in a form they can act on. With SendQuoteNow you add the customer, add your line items, and hit send. Your customer gets a branded PDF plus a link where they approve or decline with one click, and you get an email the moment they do.
- Your branding, not ours — your logo, business name, contact details, and terms on every document.
- From your phone — build and send the invoice before you leave the customer's property.
- One-click approval — no login or account needed on your customer's side.
- Automatic math — subtotal, tax, and discounts calculated as you type.
- Invoice → invoice — convert accepted work into an invoice without retyping it.