I don't sell UPS systems. I'm a procurement manager at a 280-person distribution center, and I've managed an electrical maintenance and capital budget of roughly $420,000 a year for the past seven years. I've reviewed Eaton UPS 10 kVA to 30 kVA proposals and tracked every related cost in a spreadsheet.
This checklist came from an Eaton 9355 15kVA UPS project that looked clean on paper and didn't stay clean after startup labor, an external maintenance bypass, and a generator fuel pump shut off switch location that nobody on my crew could find. If you're comparing Eaton UPS models in the 10–30 kVA range, use this before you sign.
The purpose is not to find the cheapest gray cabinet. It's to get the lifetime cost of keeping the load online onto one page.
A UPS is rated in kVA, but your load draws real power in kW. A 15 kVA UPS at a typical 0.9 output power factor gives about 13.5 kW of usable power. If your load is 11 kW and you want room to grow, that's reasonable. If the load is 12.8 kW after you add one more rack or machine, the margin is thin.
I don't have hard data on how many UPS selections are made from nameplate kVA alone, but I've made that mistake myself. Ask the vendor to include three numbers on the quote: load in kW, load in kVA, and battery runtime at that kW. If they give you only kVA, treat the quote as incomplete.
The unit price is the least useful number on any UPS quotation.
For a 10–30 kVA Eaton UPS, ask for these line items:
One vendor quoted an Eaton 9355 15kVA UPS at $18,900. A second vendor quoted $17,200, and I almost went with the second quote until I built a total cost table. The second quote needed $950 startup, a $1,200 maintenance bypass, a $450 monitoring card, and freight. That apparent bargain became $20,600. The first vendor's all-in price was lower. After signing, I still second-guessed myself because the first number on the quote was higher, but the total was lower.
I should add that this is from a 2024 quote, not a current market price. Prices change. The math doesn't.
Batteries are not a minor line item. In our conditioned electrical room, sealed battery blocks were replaced after about five years. If the room is warmer, replacement comes sooner.
Who owns the battery after the warranty? Who pays to take old batteries away? What does a capacity test cost if the service plan doesn't include one? Make the vendor put the replacement battery part number and disposal cost in writing.
A UPS can have an internal bypass for fault protection and still not give a technician a safe isolation point for replacing the static switch or working on the back end. If an external maintenance bypass is needed, don't discover that during the first battery replacement.
Startup by a factory-authorized technician is often a warranty condition, not a nice extra. Put startup into the total cost table and confirm whether it includes a load bank test.
In a 10–30 kVA installation, the UPS is rarely an island. There is usually a generator, a transfer switch, and a fuel system. That is where the UPS vendor's scope and the generator vendor's scope can leave a gap.
Avoid learning this during a real outage. During one test, the UPS held as designed, and then the generator wouldn't restart because a safety stop had disabled the fuel pump circuit. Remote support asked for the fuel pump shut off switch location. No one knew the exact spot. We spent billable time finding it in the generator control panel.
Now I walk the entire fuel path before startup: the emergency stop, the fuel valve, and the relay or breaker that kills the pump. The fuel pump shut off switch location gets a laminated tag and a photo in the maintenance binder.
If you're searching because of a vehicle, the same principle applies. Inertia fuel shutoff switches move around by model year. Find the switch on the actual vehicle before you need it.
Before I accept a new installation, I want someone on site to show me how to check continuity with a multimeter. It's not just a classroom exercise. Loose ground connections and battery interconnects can look fine at idle and fail under load.
Here's the safe version:
Never measure continuity on a live circuit. The meter is not the first tool you touch; the voltage tester is.
A charger approved for one lithium battery is not automatically approved for another. Suppose the maintenance shop uses a Minn Kota lithium battery charger for a 12V lithium pack. That charger is right for that pack. It is not a universal charger for a UPS battery string.
If the UPS is an Eaton UPS, use the charging system that Eaton designed for it. If a vendor proposes an external charger, ask for the compatibility document in writing. The phrase it will work is not a spec.
Look, I do not mean every all-in quote is automatically right. I mean an incomplete quote is never right. If you can't get all the costs onto one page, you aren't comparing Eaton UPS systems. You're comparing sales styles, and that's how budget overruns happen.