Free Solar Installation Invoice Generator
Price the system per watt, list panels, inverters, permitting and interconnection as their own lines, and download the invoice as a PDF.
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INVOICE
INV-001
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Client name
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Item description | 1 | — | $0.00 |
- Subtotal
- $0.00
- Total
- $0.00
System size, equipment and the fees in between
Solar is quoted per watt, so the simplest invoice mirrors the proposal: one line for the system with the DC watts in the quantity column and your per-watt price in the rate column — 7200 and 2.65 rather than a single lump sum. The quantity field carries three decimals, so a per-kW price works the same way with 7.2 in the quantity column. If the homeowner, their lender or a rebate program wants the equipment broken out, itemize instead — modules by count with make, model and wattage in the description, then the inverter or microinverters, racking, monitoring and labor as their own lines. Do not do both for the same scope, or the invoice reads as double billing.
Permitting, engineering and interconnection are fixed costs and belong outside the per-watt price. Building permit and plan review, a structural or PE letter, the utility interconnection application and any re-inspection fee each get a line, which keeps them visible when the customer holds the invoice next to the proposal. Solar is usually billed in stages — a deposit at contract, a progress payment at installation, and the balance at inspection or permission to operate — so send each stage as its own invoice and, on the final one, use the single discount field as a fixed "deposit paid" credit so the PDF shows the remaining balance.
The notes field holds the numbers the form has no box for: your contractor licence, the AHJ permit number, the utility account and interconnection reference, and the warranty terms, since module, inverter and workmanship run to three different periods and this is the document a homeowner keeps for decades. Keep incentives off the invoice itself — the federal residential clean energy credit ended for expenditures made after 31 December 2025, leased and third-party-owned systems are treated differently again, and state and utility programs change year to year, so state the system size, the equipment and the date placed in service and leave the rest to a tax professional. Sales tax is the other moving part: some states exempt PV equipment, some tax it, some tax the labor but not the hardware, several have amended those rules recently — Arizona's treatment changed during 2026 — and contracting is often taxed on a different base than a straight retail sale. There is one rate here, applied to the whole subtotal after any discount, so set it, clear it, or split the taxable work onto its own invoice, and check with an accountant.
A 7.2 kW rooftop system, priced per watt
A retrofit on a comp-shingle roof in Arizona: 18 modules with microinverters, billed as one per-watt line because that is how the proposal was written and how the homeowner shopped it. The flashing kit, the critter guard added after the site survey, the city permit and the utility interconnection all sit outside the per-watt number because they are fixed costs that do not scale with system size — and the critter guard is priced by the foot of roof perimeter it covers rather than by the watt.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Grid-tied PV system, 7,200 W DC — 18 x 400 W modules with microinverters, supply and install (per watt) | 7200 | $2.65 | $19,080.00 |
| Roof attachment and flashing kit — comp shingle, 36 penetrations | 1 | $540.00 | $540.00 |
| Critter guard — perimeter mesh added after site survey (per ft) | 112 | $6.50 | $728.00 |
| Permitting and plan review — City of Gilbert solar permit | 1 | $425.00 | $425.00 |
| Utility interconnection application and PTO processing | 1 | $350.00 | $350.00 |
| Subtotal | $21,123.00 | ||
| Total due | $21,123.00 | ||
The tax line is cleared because Arizona's treatment of solar changed during 2026 and contracting is taxed on a different base than a straight retail sale — set the rate that applies to your work rather than assuming the equipment is exempt.
What this invoice has to say twenty years from now
System size in watts DC
Write the DC size into the description even when you priced it per kW; rebate forms, appraisals and resale disclosures all ask for that figure.
Equipment named exactly
Module make, model and wattage plus the inverter model, matching the permit set — warranty registration years from now depends on this line reading correctly.
Fees outside the per-watt price
Permit, plan review, engineering letter and interconnection each get a line, so nobody suspects the per-watt figure quietly grew between proposal and invoice.
Warranty periods written down
Put module, inverter and workmanship terms in the notes; they run to different lengths and this invoice is what the homeowner keeps in the file.
No incentive amounts on the invoice
Give the date placed in service and the system details and stop there — the federal residential credit ended for expenditures after 31 Dec 2025 and state and utility programs keep changing, so send the customer to a tax professional rather than putting a figure on the page.
How to create an invoice online
- 1
Fill in the details
Add your business info, your client, line items, tax, and an optional logo or discount.
- 2
Watch the live preview
The invoice updates as you type, so you always see exactly what your client will receive.
- 3
Download the PDF
One click generates a clean, professional PDF invoice — free and without a watermark.
A simple invoice maker for freelancers and small businesses
Everything you need to bill a client properly — and nothing you don't. Create an invoice, check the live preview, download the PDF, get paid.
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Generate a polished A4 invoice PDF in one click — no waiting, no email required.
No sign-up, no watermark
Completely free to use. Your invoice is yours, with no branding stamped on it.
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Logo, tax & discounts
Add your logo, any tax label and rate (VAT, GST, sales tax), and percentage or fixed discounts.
Saves as you type
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20 currencies
Invoice in USD, EUR, GBP, INR, JPY and more, with correct rounding for each currency.
Frequently asked questions
Should I bill per watt or itemize the equipment?
Either works — put the system's DC watts in the quantity column against your per-watt price, or list modules, inverter, racking and labor as separate lines when the customer or their lender wants the breakdown. Pick one approach per invoice so the same scope never appears twice.
How do I handle the deposit and progress payments?
Send each stage as its own invoice, then on the final one set the discount to a fixed amount as a "deposit paid" credit so the PDF shows the balance owed. Write the payment schedule into the notes so the customer can see which stage they are paying.
Where do the permit and interconnection numbers go?
The notes field — there are no dedicated boxes for permit, licence or utility reference numbers, so the AHJ permit, the interconnection application, your contractor licence and the warranty periods all go there. What you download is an invoice, not a permit application, an interconnection form or a rebate claim; those still go to the AHJ, the utility and the program administrator on their own paperwork.
Should the invoice show the federal tax credit?
No — and for most 2026 residential work there is nothing to show, because the federal residential clean energy credit under Section 25D ended for expenditures made after 31 December 2025, so a homeowner buying a system outright this year generally has no federal credit to claim. Leased and third-party-owned systems, and state or utility programs, follow their own rules. Give their preparer the facts — system size in watts DC, equipment makes and models, date placed in service — never a credit amount, and tell them to check with a tax professional.