{"id":7351,"date":"2026-09-09T12:48:46","date_gmt":"2026-09-09T12:48:46","guid":{"rendered":"https:\/\/couleenergy.com\/?p=7351"},"modified":"2026-09-09T12:48:49","modified_gmt":"2026-09-09T12:48:49","slug":"custom-solar-panel-rfq-checklist","status":"publish","type":"post","link":"https:\/\/couleenergy.com\/fr\/custom-solar-panel-rfq-checklist\/","title":{"rendered":"Liste de v\u00e9rification pour une demande de devis de panneaux solaires sur mesure\u00a0: Que faut-il envoyer \u00e0 un fabricant avant de demander un devis\u00a0?"},"content":{"rendered":"
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A working RFQ template and engineering checklist for OEM buyers, product engineers, installers and project developers sourcing custom, flexible or BIPV solar modules. Written from the factory side of the table.<\/p>\n<\/div>\n \n

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R\u00e9ponse courte<\/p>\n

Before you ask for a quote, send the manufacturer enough information to judge feasibility, not just price. That means the product and how it is used, the daily energy the load needs, the battery and charge controller it must feed, the usable area with keep-out zones, the mounting and bending conditions, the electrical interface, the environment, the appearance, and the volume you expect. A wattage and a size are not an RFQ. They are a guess dressed as a specification.<\/p>\n

Send the full package and a competent factory answers with a feasibility review: a proposed cell layout, a voltage window, a material recommendation, a bend limit, named risks and a validation plan. Send only watts and you get the closest standard panel on the shelf.<\/p>\n <\/div>\n<\/div>\n\n\n\n

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Why Most Custom Solar Panel RFQs Get a Slow or Wrong Answer<\/h2>\n

We read a lot of enquiries. Most arrive in a single line: “Please quote your 100 W flexible panel.” That cannot be quoted accurately — only answered with a question — and every question adds a day to your project. Multiply by three suppliers and you have lost a fortnight before anyone has drawn anything.<\/p>\n

A custom module is not a catalogue item with a variant picker. Its outline, voltage, laminate and cable exit are all consequences of decisions you have already made about your product. Until the factory knows those decisions, it is pricing an imaginary panel.<\/p>\n

There is a second, quieter problem. Buyers over-specify what feels technical and under-specify what actually sets the design. They name a cell technology in line one, then never mention the charge controller, the roof vents, or how the panel is held down. Cell technology moves the answer a few percent; the other three can move it by half.<\/p>\n

So this guide is written from the factory side of the table. For each item, we explain what a manufacturer does with the information, and what happens when it is missing.<\/p>\n<\/div>\n \n

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Start With Energy, Not Watts: How to Size a Custom Panel<\/h2>\n

Here is the single most useful change you can make to an RFQ: stop opening with a wattage, and open instead with the energy your product consumes in a day.<\/p>\n

Wattage is an output of the design; energy is an input. A watt figure tells the factory almost nothing, because the same load produces very different array sizes depending on where the product lives and which month you design for.<\/p>\n

Take a small monitoring device drawing about 3 W around the clock, which is 72 Wh per day, and assume a realistic 65% system efficiency once you allow for the controller, battery round-trip, heat and dirt. The required array now depends entirely on the sun hours you design against.<\/p>\n \n

\n \n \n \n \n \n \n \n
Design condition<\/th>\n Peak sun hours<\/th>\n Array needed<\/th>\n Panel area at 190–215 W\/m²<\/th>\n <\/tr>\n <\/thead>\n
Northern winter<\/td>\n 2.5<\/td>\n ~44 W<\/td>\n 0.21–0.23 m²<\/td>\n <\/tr>\n
Shoulder season<\/td>\n 3.5<\/td>\n ~32 W<\/td>\n 0.15–0.17 m²<\/td>\n <\/tr>\n
Summer only<\/td>\n 5.0<\/td>\n ~22 W<\/td>\n 0.10–0.12 m²<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n

Worked from 72 Wh\/day at 65% system efficiency. The area band is bracketed by real products: a 260 W back-contact ETFE laminate at 1,555 × 770 mm works out near 215 W\/m², while a 120 W back-contact flexible panel at 1,195 × 540 mm sits near 186 W\/m². Treat it as a planning band, not a promise.<\/p>\n

Same device, same product, twice the panel. Nobody in the factory can pick between those three rows for you, because the choice is commercial rather than technical. Tell us which month has to work and the wattage answers itself.<\/p>\n<\/div>\n\n\n\n

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The Five Lines That Change the Quote Most<\/h2>\n

If you only have five minutes, write these five lines. They carry more weight than everything else combined.<\/p>\n \n

\n \n \n \n \n \n \n \n \n \n
Line<\/th>\n What the factory does with it<\/th>\n <\/tr>\n <\/thead>\n
Usable area, with keep-outs marked<\/td>\n Sets the outline, the cell count and therefore the honest wattage ceiling. Narrow strips lose the most.<\/td>\n <\/tr>\n
Charge controller model and input window<\/td>\n Sets the series cell count, so it sets Vmp<\/sub> et Voc<\/sub>. Get this wrong and the panel underperforms forever.<\/td>\n <\/tr>\n
How the panel is fixed down<\/td>\n Sets operating temperature, backing choice and warranty language.<\/td>\n <\/tr>\n
Rayon de courbure minimal en millim\u00e8tres<\/td>\n Decides cell format, interconnect method and whether the build is possible at all.<\/td>\n <\/tr>\n
Sample, first order and annual volume<\/td>\n Decides tooling, process route and how much engineering time the project can carry.<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n

Notice what is missing: cell brand, efficiency percentage, certificate names. Those matter, but they are refinements. The five lines above are structural.<\/p>\n<\/div>\n

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1. Product and Application Context<\/h2>\n

Begin with the thing the panel is going on, not the panel itself. A photo beats a paragraph, a dimensioned sketch beats a photo, and a CAD file beats both.<\/p>\n

What to include<\/h3>\n
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  • Photos of the product and the surface the panel will sit on, plus a sketch, drawing or CAD file with the intended solar area marked<\/li>\n
  • Application type: RV, marine, van, portable device, IoT sensor, vehicle roof, facade, awning<\/li>\n
  • Whether the product is stationary, mobile, or packed away between uses<\/li>\n
  • Target countries or markets for sale<\/li>\n <\/ul>\n

    Application changes the laminate, the encapsulant, the reinforcement and the qualification route. A panel bonded to a boat deck and a panel that folds into a rucksack are different products, even at the same wattage.<\/p>\n<\/div>\n\n\n\n

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