SDMO Generator: An Admin Buyer’s Honest FAQ on Power, Pricing, and Pitfalls

SDMO Generators: Everything an Admin Buyer Needs to Know (But Doesn’t Know to Ask)

I’m the office administrator for a mid-sized manufacturing company—about 150 people across two sites. I manage all our vendor relationships, including backup power, which is roughly $50,000 annually across 8 vendors. When I took over purchasing in 2020, I knew nothing about generators. After five years of managing these relationships, I’ve learned a few things the hard way. This FAQ covers the questions I wish I had asked upfront about SDMO, Kohler-SDMO, and the whole backup power ecosystem.

Let’s dig in.

Q: What exactly is an SDMO generator? I see them listed alongside Kohler units.

Good question. SDMO is a French manufacturer of industrial diesel generators. They’ve been around since 1966, and in 2006 they partnered with—or were acquired by—Kohler. So when you see a Kohler-SDMO generator, it’s essentially a Kohler-branded unit built on SDMO’s industrial platform. The partnership gives them a wide power range, from about 20 kVA all the way up to 1250 kVA. In my experience, the 80 kVA SDMO generator is a sweet spot for medium-sized facilities, but I’ve also sourced a 650 kVA Kohler-SDMO for a site expansion—that thing is a beast.

Honestly, I’m not a diesel mechanic, so I can’t speak to the technical nuances of the alternator or engine block. From a procurement perspective, what matters is that the SDMO-Kohler link gives you access to Kohler’s global service network. That’s been a lifesaver for us.

Q: We’ve been quoted on a "generac 50kw natural gas generator." How does that compare to an SDMO?

They’re different animals. The Generac 50kW natural gas generator is a great option if you have a natural gas hookup and need a continuous-rated unit for long outages. They’re clean, quiet, and the fuel supply is practically infinite if the gas grid stays up. SDMO, on the other hand, is primarily diesel. Diesel is more energy-dense, and the units tend to be more robust for industrial applications. I went back and forth between a Generac 50kW and a 80 kVA SDMO for our main plant for maybe two weeks. The Generac offered lower fuel cost and quieter operation, but the SDMO offered proven reliability under sustained heavy loads. Ultimately, we chose the SDMO because our operations are 24/7, and losing power for more than 15 minutes means shutting down a production line. The higher upfront cost was worth the certainty.

In my opinion, if your facility relies on natural gas, the Generac is a strong contender. If you need rugged, industrial-grade backup that can take a beating, lean towards SDMO.

Q: What’s the deal with a "solar generator trailer"? Should I consider that instead?

A solar generator trailer—which is basically a battery bank charged by solar panels, mounted on a trailer—is for different use cases. It’s quiet, zero-emission, and doesn’t need fuel. But it’s not a direct replacement for a 80 kVA diesel generator. If I remember correctly, a typical solar trailer might offer 10-20 kW of continuous power, enough for a construction site or an event. For a factory with heavy machinery? Not a chance. This gets into technical territory that isn’t my expertise. I’d recommend consulting a power systems engineer if you’re in that 10-20% of cases where solar might work.

From my perspective, unless you’re dealing with temporary sites or remote locations where fuel delivery is a nightmare, a diesel unit is still the standard for continuous backup.

Q: How do you actually connect a generator to a house? I’ve seen people talk about it.

This is a critical safety question, and I need to be clear: I’m not an electrician. What I can tell you from a facilities management perspective is that there’s a right way and a very dangerous way to do this. The safest, most common method is using a manual or automatic transfer switch. This switch isolates your building from the grid when the generator runs, preventing backfeed, which can electrocute a lineman.

The question of how to connect generator to house without transfer switch comes up in searches, and the honest answer is: you shouldn’t. I’ve seen stories of people using suicide cords (a double-ended male plug) or plugging the generator into a dryer outlet. That’s illegal in most jurisdictions and incredibly dangerous. The few hundred dollars for a transfer switch is nothing compared to the risk. The National Electrical Code (NEC) requires a transfer switch for permanent generator connections. Full stop.

I still kick myself for not pushing harder on the budget for a proper transfer switch in our initial install. We had a temporary connection for a week during a renovation, and the electrician’s safety briefing made me realize how close we were to a serious incident. If I’d known then what I know now, I would have prioritized that expense.

Q: Okay, but for a home or small office, is an SDMO overkill?

Probably. An 80 kVA SDMO generator is sized for a small factory or a large commercial building. For a typical house, you might need 5-20 kW, depending on HVAC and appliances. An 80 kVA unit (about 64 kW) would be wildly oversized—and expensive to run. The fuel consumption alone at idle would be painful. I recommend an SDMO for applications in that 20-1250 kVA range. If you’re in the 5-50 kW range, consider a consumer-grade unit. There’s no shame in using the right tool for the job.

Quick recap if you’re evaluating an SDMO:

• The 80 kVA SDMO is a workhorse for mid-sized commercial use.
• The 650 kVA Kohler-SDMO is for serious industrial loads.
• Don’t confuse it with a portable or home backup unit—different class entirely.
• Always, always use a transfer switch for any permanent connection.

There’s something satisfying about getting the power right. After all the vendor calls and spec sheets and budget negotiations, when you flip that switch during a storm and the lights stay on—that’s the payoff. I hope this FAQ saves you some of the headaches I went through.