Price per Watt Ranges for TOPCon 550W-700W OEM: How to Read Quotes
Key Takeaway
A price per watt on a TOPCon OEM quote is the money on that quote divided by the nameplate watts that same quote sells. Two numbers in the 550 W to 700 W band are comparable only after the Incoterm and named place, the wattage bin, the bill of materials, the warranty floor, and the freight the buyer still pays are on the same basis. This note does not state a market price.
Table of Contents
When Two Cents-per-Watt Cells Disagree
A buyer comparing TOPCon modules often receives two proformas and one question from finance: which cents-per-watt number is lower. The band on both offers may say 550 W to 700 W. The cells in the spreadsheet are not the same purchase. One quote can be ex works at a 560 W bin. The other can be cost, insurance, and freight to a destination port at a 660 W bin. One price may be per module. The other may already be per watt. Glass, connector, cable length, and the warranty may sit in a footnote or may be missing.
The pain shows up twice. At bid opening, the lower cents-per-watt line wins the internal ranking before anyone has named the port. After delivery, the project team discovers that freight, a heavier glass stack, or a lower year-30 power floor was never in the cell that procurement compared. The module factory did not hide those facts if they were printed. The comparison dropped them.
Price per watt is a useful unit only after the fraction is defined. The numerator is a sum of money under a named commercial term. The denominator is one watt definition, almost always the nameplate bin on the proforma, not the family’s highest wattage and not a field energy estimate. Until both the money and the watt mean the same thing on both columns, a smaller quotient is not a cheaper module.
Treat a blank as a blank. If the quote does not name the glass, do not assume it matches the other offer. If it does not name freight, do not insert a lane rate from memory. A normalization sheet with empty cells is a true status. A sheet filled with averages is a different offer you invented.
Five Lines to Lock Before You Rank
Build one worksheet with a column per quote. Rank the quotes only after these five lines either match or have been converted with a source you can point to. If a line cannot be converted, keep the quotes side by side and do not collapse them into one cents-per-watt winner.
Commercial term and named place
Write the Incoterm and the geographic name beside it. Ex works at a factory, free carrier at a port, free on board, cost and freight, CIF, and delivered at place are different splits of cost and risk. Under Incoterms 2020, CIF still transfers risk when the goods are on board the vessel at the origin port, even though the seller pays freight and insurance to the named destination port. A CIF price is therefore not a door-delivered price, and it is not an all-risk price through the voyage. EXW makes the goods available at the named premises. Who loads the truck, who files the export declaration, and who pays the first inland leg must be written down, because jobsites argue about those three items after the price is accepted.
Currency and payment sit on the same line. A price in one currency under a letter of credit is not the same cash cost as an open-account price in another currency. Convert with the rate your treasury desk assigns to the payment date, and file that rate with the sheet. Do not compare the raw numerals across currencies.
Wattage bin in the denominator
Divide by the bin the proforma sells. A 560 W line and a 660 W line are both inside a 550 W to 700 W TOPCon conversation, and they are different electrical parts. Current, voltage, module area, and modules per megawatt of nameplate all move. A positive-only flash tolerance does not raise the denominator. If the contract sells 560 W with a tolerance of 0 to positive 5 W, the price is still divided by 560 W unless the contract says you pay on the factory flash. Rear-side gain on a bifacial module is a site result. It is not extra watts in the price denominator unless the contract explicitly sells energy that way, which a module proforma usually does not.
Bill of materials
Force both quotes to name the construction, not only the watts. The lines that change the physical module are front-glass thickness and heat treatment, rear cover (polymer backsheet or glass), encapsulant family, cell format and half-cut count, frame or frameless edge, connector series, and cable length. Frame material, when a frame is present, is its own sourcing question. It is not settled by the word framed. Two quotations at a similar cents per watt with different glass are two products. Keep them on two rows.
Warranty floor
Read the product term and the power schedule as separate numbers. A long power warranty does not extend a shorter workmanship term. For the power schedule, compute the share of nameplate at the end of year 30 from the first-year cap and the later annual step printed on that quote. Compare those watts at standard test conditions. Do not compare the slogan 30-year linear if the rates differ. The measurement rules, the warrantor’s legal name, and the remedy belong in the file next to the price. They are not optional once the cents per watt are close.
Freight and the charges the term leaves open
Add only the legs the chosen Incoterm does not already include. Ocean freight and insurance may be inside CIF and outside EXW. Destination terminal handling, import duty, and inland haulage to site are outside a typical CIF quote. Ask the forwarder for the lane you will actually ship. Freight is usually a cost per container or per shipment. Divide that cost by the number of modules the packing plan puts in the container, then divide by the nameplate watts if you still need a per-watt figure. Do not divide a container invoice by a megawatt and call it done if the two quotes pack a different module count.
Quantity is part of the same commercial line. The unit price applies to the quantity written on that quote. If the two offers name different quantities, they are different offers even after the Incoterm matches. This note does not state a minimum order quantity. Copy the quantity from each proforma and leave the cell blank if the proforma is silent.
An Illustration: EXW 560 W versus CIF 660 W
The figures below are an illustration of the arithmetic. They are not a market price, not a Weltrus price, not a freight tariff, and not a packing standard. The unit is an illustration unit, written IU, so the numerals cannot be read as a currency quote.
Quote A in this illustration is EXW at the seller’s premises, 560 W nameplate, at 56.00 IU per module. Dividing 56.00 by 560 gives 0.100 IU per watt. Quote B is CIF to a named destination port, 660 W nameplate, at 62.70 IU per module. Dividing 62.70 by 660 gives 0.095 IU per watt. A spreadsheet that stops here says Quote B is 0.005 IU per watt lower. That reading is the mistake the rest of the table corrects.
Freight, still inside the illustration: suppose a forwarder invoice of 1,344 IU covers one container, and the packing plan in this illustration fits 300 modules of Quote A in that container. Dividing 1,344 by 300 gives 4.48 IU per module. Adding 4.48 to 56.00 gives 60.48 IU per module. Dividing 60.48 by 560 gives 0.108 IU per watt. Quote B stays at 0.095 IU per watt only if its CIF price already includes a comparable ocean leg. Duty, destination handling, and inland haulage are still outside both columns. Leave them blank until they are quoted. The 0.005 IU per watt gap that favored B before freight was attached to A is not a stable ranking.
Module count for a 1,000,000 W nameplate block, arithmetic only: 1,000,000 divided by 560 is 1,785.7, so 1,786 whole modules deliver 1,000,160 W of nameplate. 1,000,000 divided by 660 is 1,515.2, so 1,516 whole modules deliver 1,000,560 W of nameplate. The difference is 270 modules. Clamps, connectors, and handling labor scale with pieces. The IU-per-watt cell does not buy those pieces. Read Imp, Isc, Voc, and Vmp on each datasheet before you reuse a string design. A 660 W TOPCon module is not a 560 W module with the same current.
Warranty arithmetic, also an illustration, using two different printed schedules so the title 30-year linear cannot hide the gap. For Quote A, a first-year loss cap of 2.0 percent leaves 98.0 percent at the end of year 1. Twenty-nine later steps of 0.45 percent are 13.05 percentage points. The year-30 floor is 84.95 percent of nameplate, and 0.8495 times 560 W is 475.7 W at standard test conditions. For Quote B, a first-year cap of 1.0 percent and then 0.35 percent per year gives 88.85 percent at year 30, and 0.8885 times 660 W is 586.4 W at the same test. Those watts are laboratory floors for this illustration. They are not annual energy, and they are not a reason to prefer a factory. They show why a lower IU per watt can still be a lower warranted watt if you never compute the floor.
| Line | Quote A (illustration only) | Quote B (illustration only) |
|---|---|---|
| Incoterm and place | EXW, seller’s premises | CIF, named destination port |
| Nameplate in the denominator | 560 W | 660 W |
| Price per module | 56.00 IU | 62.70 IU |
| Price per watt before freight alignment | 0.100 IU/W | 0.095 IU/W |
| Illustrated BOM identity | 3.2 mm front glass, polymer backsheet, framed | 2.0 mm glass front and rear, framed |
| Freight added in this illustration | 4.48 IU per module (1,344 IU container divided by 300 modules) | Ocean leg treated as already inside the CIF price |
| Price per watt after that one freight line | 0.108 IU/W | 0.095 IU/W, duty and inland still open |
| Whole modules for at least 1,000,000 W nameplate | 1,786 modules (1,000,160 W) | 1,516 modules (1,000,560 W) |
| Illustrated year-30 STC floor | 475.7 W (84.95% of 560 W) | 586.4 W (88.85% of 660 W) |
Use the table as a pattern, then replace every IU figure with the number on the proforma in front of you. If your Quote A has no glass line, the BOM cell stays empty. An empty cell blocks a ranking. It does not authorize you to copy Quote B’s glass into Quote A. The same rule applies to the year-30 floor: use the rates printed on each limited warranty, not the sample rates above.
After the five lines are filled from real documents, you still have a module comparison, not a plant comparison. Inverter count, structure, trench length, and labor sit outside the module IU per watt. Keep the normalized module price in the module section of the model. Do not paste it into the installed-cost cell.
What a Normalized Module Price Does Not Decide
- It does not publish a market range. Nothing in this note is a current TOPCon price. The IU columns exist so the arithmetic can be checked. Delete them when you build a live sheet.
- It does not rank factories. Bankability, the legal warrantor, and the certificate holder are separate reviews. A lower delivered IU per watt does not answer them.
- It does not set quantity, lead time, or payment terms you were not given. Copy those fields from the proforma. If they are absent, ask. Do not fill them from a previous order.
- It does not choose 560 W versus 660 W. String voltage, string current, racking length, and the site layout choose the bin. Price per watt is calculated after that choice, or it is shown as two options with two designs.
- It does not turn a module price into energy. The year-30 floor used above is power at a stated laboratory test. Weather, soiling, shade, and the inverter are the yield model.
- It does not treat a family range as one SKU. A 550 W to 700 W catalog span can contain more than one cell format, more than one outline, and more than one bill of materials. The proforma must name the code you will receive.
Send Both Proformas, Not Just the Cents per Watt
Share the two quotations, the destination port, and the model codes. Weltrus will help line up Incoterm, bin, bill of materials, and warranty floor so the comparison uses the same basis.
Frequently Asked Questions
Why is a lower cents-per-watt figure not automatically the cheaper module?
The figure is only the quoted money divided by the wattage on that same quote. It leaves out the Incoterm, freight the buyer still pays, a different glass stack, and a different year-30 power floor. Align those lines before you rank the two numbers.
What is the practical difference between EXW and CIF on a module quote?
EXW means the seller makes the goods available at the named premises, and the buyer arranges the rest. CIF means the seller pays cost, insurance, and freight to the named destination port, while risk still transfers at the origin port under Incoterms 2020. Duty and inland haulage after that port stay with the buyer unless another term says otherwise. The two prices are not the same delivered cost.
Which wattage should you use in the denominator?
Use the nameplate bin the proforma actually sells, such as 560 W or 660 W. Do not divide by the top of a 550 W to 700 W family range, and do not add the positive flash tolerance or a bifacial gain estimate to the denominator.
Does the glass stack matter if both quotes show a similar cents-per-watt number?
Yes. Front-glass thickness, temper, and a polymer backsheet versus dual glass change weight, mechanical load, and how the module is handled. Matching cents per watt with a different bill of materials is a different product, not a discount on the same product.
Should freight sit inside the cents-per-watt comparison?
Yes, once you know it. Freight is usually charged per container or per shipment, so convert it to a per-module amount using the packing plan, then add it only to the quote whose Incoterm leaves that leg unpaid. Until the forwarder gives a figure for that lane, leave the cell blank. Do not fill it with a guessed rate.
