How to Find Your Generator’s Model and Serial Number
You’re looking for a manual or ordering a replacement part. The store asks for your generator model number. You look at the machine and see a brand, a wattage rating, and three different stickers. Which number do you use?
I start with the data plate, the small label that identifies the generator itself. On an open-frame unit, I look along the frame first. On an enclosed inverter, I start with the outside of the housing. This guide shows you where to look, how to tell the numbers apart, and what to do when the label has worn off.
Step 1. Look for the data plate
Take a flashlight and look for a small sticker or metal plate with several lines of print. You’re looking for fields marked Model, Model No., Serial, or S/N. Depending on the unit, you may find the numbers together or on separate labels. Check the accessible areas first. If you still can’t spot the label, use your manufacturer’s location guide before removing a cover.
| Generator type | Where I’d start |
|---|---|
| Open-frame portable generator | Look along the lower frame rails and crossbars, then check the outside of the front or rear panel. |
| Enclosed inverter generator | Look around the side and rear of the housing. Check the model’s manual for a label-location diagram if you can’t see it. |
| Home standby generator | Use the manufacturer’s label locator for that unit. The housing and data plate location differ from a portable generator. |
Generac’s portable generator label guide shows examples on a lower crossbar and on an inverter enclosure. Champion’s model and serial number guide has separate diagrams for portable, inverter, open-frame inverter, and standby units. Use the drawing that matches your generator’s design.
Step 2. Write down the model and serial number separately
The model number identifies the generator design or version. The serial number identifies your individual unit and can help the manufacturer find the correct production range. Copy both exactly as they appear. Keep any letters before the digits, leading zeroes, and suffixes. Take a photo before you put the generator away. If you can’t tell whether a character is a zero or the letter O, you’ll have the original label to compare.
You may also see a wattage rating in much larger print. For instance, Honda’s EU2200i specifications show the full model name EU2200ITAN and a maximum output of 2200W in separate fields. A photo of the model label gives the parts seller more to work with than the wattage on the case.
If the plate includes a separate type or revision field, write that down too. When an online lookup rejects your entry, check the input format shown next to the search field. A catalog may ask for the serial prefix and digits in separate boxes. Honda’s parts lookup does exactly that.
What if the engine has its own number?
Some generators have one identifier for the complete unit and a separate engine model number. Save both when you find them. I’d start with the generator’s data plate for a generator owner’s manual or a frame component. When a dealer asks for an engine part, send the engine label too. Briggs & Stratton’s identification guide shows how engine model, type, and code can differ from the product model and revision number.
Step 3. Check the serial range before choosing a manual
Once you have the numbers, open the manufacturer’s support site. Enter the full model or serial number and look for a match in the document list. If several manuals appear for the same model, compare the printed serial number range with your label. That one check can save you from downloading a manual for a different version and using its parts list to place an order.
Here’s a real example. Honda lists separate EU2200i owner’s manuals for units through EAMT 2184047 and units starting at EAMT 2184048. If your label reads EAMT 2184048, start with the second listing and confirm its type code. The model family is the same, but that last digit changes which range you fall into.
I save the manufacturer’s download page as well as the PDF. The support page keeps the serial ranges visible, which helps if the downloaded file has a generic name or you’ve saved manuals for several generators. If you bought your unit abroad, start with the manufacturer’s support site for the market where it was originally sold.
If you’re doing this because you need a plug, you can look up the OEM spark plug for your generator model. Keep your owner’s manual open so you can confirm the plug specification for your version before you order.
Step 4. Recover the numbers if the label is missing or faded
A worn sticker makes the job slower. Start with records that came from your own unit. Look for an original box label, a dealer invoice, a registration confirmation, or an old service record. Generac says the serial number may be on the original packaging. Champion also points to the operator’s manual cover as a possible place to find it.
If you can still see part of the label, take a close photo with light coming from the side. Send the manufacturer or dealer that photo along with a clear picture of the generator and any purchase record you have. Tell them which characters you can read and which are unclear. If they can identify only the model family, ask what additional information they need before you order a part.
What to ask for when buying a used generator
Ask the seller for a photo of the data plate before you go to see the generator. A listing title may give you the brand and wattage, while the photo gives you the identifiers to check the manual and parts catalog. At the inspection, compare the photo with the label on the actual machine. If the label is missing, ask for the original purchase paperwork and see whether the dealer can confirm the model from it.
Step 5. Save the numbers where you’ll find them again
I keep a copy of the label photo with the receipt and the matching manual. Give the folder a name you’ll recognize, especially if you own more than one generator. The next time you need a replacement part, you can send the dealer the exact model and serial number in one message. You’ll also have those details handy if you need to check a warranty or recall notice.
- Generator brand and full model number, including any suffix or revision shown on the label.
- Serial number, including any prefix, and a clear photo of the data plate.
- Engine model, type, or code if your unit has a separate engine label.
- Owner’s manual link and purchase record for your unit.
When you’re ready to buy, use those details to verify fitment with the seller. Honda’s parts catalog recommends confirming your selection with a dealer before ordering. For a recall, look up the exact unit using the manufacturer’s instructions. The U.S. CPSC’s Generac recall notice shows why you may need both numbers to check whether a particular machine is affected.
If the dealer tells you your part is no longer available, here’s what to do when a generator part is discontinued.