Perkins Generator FAQ: 7 Answers From Someone Who's Made the Mistakes

I've been handling Perkins generator set orders since 2016. In that time, I've personally made 14 documented mistakes worth roughly $210,000 in rework and delays. This FAQ is me handing over what I learned the hard way — read it, and you can make your own new mistakes instead of repeating mine.

What makes a Perkins generator different from other generator sets?

First, let's clear up the shorthand. "Perkins generator" doesn't mean Perkins builds the whole thing. Perkins makes the engine. The generator set is the engine, alternator, control panel, cooling system, and enclosure assembled into a package. What you're buying is a package powered by a Perkins engine.

The engine is the reason people pick Perkins. Two words: reliability and parts availability. These engines run excavators, pumps, and generators all over the world. Parts are everywhere. That's the real selling point, and it's why the brand keeps showing up in wholesale and OEM orders.

But here's the mistake I watch buyers repeat: they get hypnotized by the engine badge and ignore the rest of the package. I've seen people approve a generator based on the engine, then come back angry when a cheap alternator failed. The engine is the heart. The rest is the body. Check both.

Is a 175 kW Perkins generator the right size for a Florida project?

Maybe. Depends on your load profile, and you can't know that from the kW number alone.

Generators have two ratings: standby and prime. Standby (running only during outages) means you can push it harder for short stretches. Prime (continuous running) means less headroom. A 175 kW standby rating is not a 175 kW prime rating. People mix these up constantly.

Florida adds another layer: hurricane outages. After a storm, a generator might run for days. I had a customer in Orlando size their unit for normal outages—2 to 4 hours, a few times a year. Then Hurricane Ian hit. They ran that generator for a week. By day three, they were rotating loads manually because it couldn't hold the sustained draw. They saved money upfront. It cost them triple in the end.

And here's the part I wish someone had told me: Florida has wind load requirements for outdoor generators, and Miami-Dade's code is no joke. A permit rejection in June 2024 is what changed how I think about compliance docs. One missing wind load certificate held up a project for three weeks. I didn't fully understand the value of that paperwork until that exact phone call.

What should a whole home generator distributor look for in a supplier?

I work on the supplier side of this, so I've watched distributors step into the same traps over and over. Three checks.

First: load test data. Does the supplier actually test each unit, or is it a generic test sheet with the model number filled in? I've seen orders where the test sheet didn't match the unit. Took a phone call to catch it. If a supplier can't show you specific test data for your unit, that's a red flag.

Second: warranty clarity. If the engine fails in year two, who takes the call? The engine maker? The set manufacturer? If your supplier can't answer that in one sentence, you're the one holding the bag.

Third: communication during production. Do they send updates, or do you have to chase them? I've watched distributors lose end clients because they couldn't answer "where's my order?" That's a communication failure, and it's fixable.

How does backup generator private label work? Where do distributors mess it up?

Private label is simple in theory: you sell a generator set under your brand. We build it, you brand it, you own the customer relationship. The appeal is obvious—your brand builds equity instead of the manufacturer's.

The risk is less obvious. Your name on the unit means your name on every document that comes with it. If the spec sheet still has the manufacturer's name, or the emissions certificate is missing, it's your problem in the customer's eyes.

Three failures I've seen more times than I can count:

• Spec sheets sent straight to an end customer with the old brand name on them. Embarrassing (and it kills trust).
• Warranty terms that don't line up with what you promised the buyer. The customer thinks they're covered for five years. The manufacturer covers two. Guess who gets the angry phone call.
• Compliance papers not verified before the unit ships. Your label means your liability.

Before signing any private label agreement, put every document on the table—specs, test results, emissions certs, warranty terms. Check each one. Then check again.

What do solar generator compliance requirements have to do with backup generators?

First trap: "solar generator" means different things to different people. A customer asked me about "solar generator compliance requirements" last year, and I assumed they meant a solar-powered generator. What they actually meant was a diesel backup generator for their solar-equipped home. We lost a week because I didn't ask one clarifying question up front.

If you genuinely need a solar-powered generator (usually a battery-based power station with solar panels), the compliance path involves UL 2743 for the portable power station and UL 1741 for the inverter. It does not involve EPA emissions rules. That's a completely different product category—we don't build those at Perkins Generator (and I'll point you to better sources if that's what you're after).

If you need a backup generator for a home or business that has solar, you're looking at:

• NFPA 110 for standby power performance
• NFPA 37 for installation
• EPA emissions requirements for the engine
• IEEE 1547 for the solar interconnection

Here's what I learned: the solar contractor won't handle your generator's compliance paperwork. I assumed that once, and it cost me a 4-week delay. Ask for the full documentation list before you order, not after.

Should I buy direct from a manufacturer or through a distributor?

Short answer: it depends on what you're buying.

One generator for a specific project? Buy through a distributor. They know local codes, help with permits, and can show up on-site if something goes wrong. I've seen buyers try to save a few percent by going direct, then struggle when nobody answers the phone on a weekend emergency.

Multiple units as an ongoing program? Direct can make sense. You're building a relationship, you're buying in volume, and you need more than "help me pick one."

But the thing I tell everyone: efficient buying isn't fast buying. The most efficient path is the one where the right person catches mistakes before the unit ships. That might be a distributor. That might be us. It's whoever is actually accountable.

Honestly, I have mixed feelings here. On one hand, direct sales are cleaner to manage. On the other, I've seen distributors rescue projects I would have messed up because they knew the local context. Both channels exist for a reason.

What's the compliance item everyone forgets until it's too late?

Emissions documentation. Specifically, the EPA certification for the engine.

Every stationary diesel generator needs an engine with current emissions certification, and the certificate has to match the exact engine serial number—not just the model. I've seen paperwork for the right model, wrong serial. I've seen certificates dated the week the engine was built.

Here's where I ate my own words. Our engineers always said: verify certs at the dock. I thought it was overkill. Then, in 2022, a container of units got held at customs because the emissions labels didn't match the certificates. Two weeks of demurrage and storage fees. That was a $12,000 lesson I still hate thinking about.

So now we run automated checks on emissions certificates before anything ships. It's cut our document-related delays by about 70% in the past 18 months, and it caught 14 potential errors in the first year alone.

Bottom line: ask for the emissions certificate. Check the serial number against the engine. Do it twice. It's cheaper than the alternative.