I'm a procurement manager at a 180-person colocation and managed services provider. I've owned our power-protection budget for about six years, which means I've reviewed every Eaton UPS quote, every battery invoice, and every emergency service call that came through the door. This FAQ is the one I wish I'd had when I started.
I can't give you a universal price, because UPS maintenance is more like a car service contract than a monthly subscription. For one 20 kVA Eaton 9PX with a single VRLA battery cabinet, our 2025 budget line is $2,400 per year for a preventive maintenance contract that includes two site visits, firmware updates, battery impedance testing, and load bank testing every other year. That does not include battery replacement cells, which we've seen run $3,800 for a full string on that same unit.
When you compare quotes, don't compare just the first-year number. A quote that looks 15% cheaper may have a smaller scope: no after-hours response, no thermal imaging, no load bank. I've learned to write down exactly which tasks the contract includes (note to self: don't accept a quote that doesn't list load bank testing separately). In our 2023 audit, we found we were paying for "24/7 remote monitoring" that was really just an email alert. Not a huge deal, but it changes the TCO.
My experience here is based on about 30 Eaton systems in the 5 kVA to 200 kVA range. If you're dealing with a 9395 in a hospital, your maintenance contract will look different.
The Eaton Blade UPS was designed for high-density blade server chassis. It did that job well. If you already own one, keep it on a maintenance contract and make sure the batteries are within their replacement window. But if someone offers you a used Blade UPS at a tempting price, I'd pause.
The unit itself may have years of life, but the battery packs and control board are the real cost. Older UPSs often use proprietary battery connectors. A 'cheap' used unit can become expensive when replacement batteries cost almost as much as a newer, more efficient modular unit. I've also seen service providers charge extra because they no longer stock parts for older Blade UPS models.
As a cost person, I'd rather buy a current Eaton 9PX or 93PM with a standard battery cabinet than take on an older Blade UPS with unknown service history. That's not a knock on the product—it's a comment on the total cost of ownership after five years.
Yes, technically. The GoPro Hero 9 battery charger draws a few watts and won't trip a UPS. But it's not what a UPS is for. A UPS is meant to keep a load alive through a sag or a short outage. If you're using it to charge a GoPro battery for hours, the UPS's inverter and power electronics are running. The overhead can be higher than the charger's draw. That's the opposite of efficient.
A much cheaper solution is a USB power bank. I keep a small one in my go bag for cameras and phones. The UPS is for the server rack, not for camera batteries. This may seem obvious, but I've had three different engineers ask me to approve "just one adapter" so they could charge personal devices through the rack PDU. That's how scope creep starts.
If you need the exact GoPro Hero 9 battery charger, buy the one made for that model or a reputable USB-C charger. Don't route it through enterprise power protection equipment.
Probably not. A UPS protects connected loads downstream of itself. It does not protect the HVAC equipment that is on the same upstream branch circuit. If the HVAC fuse keeps blowing, the cause is almost always inside the HVAC system: a grounded compressor, a failing blower motor, a shorted transformer, or a contactor that's welded shut.
I don't have hard data on how many HVAC fuse failures are caused by actual power quality issues. Based on the service tickets I've reviewed over six years, my sense is it's less than 5%. The rest are equipment faults. So before you spend money on a bigger UPS or a line conditioner, have an HVAC tech check the fuse with an ohmmeter and verify the amp draw while the unit starts. I made the mistake of blaming utility power once. It turned out to be a $40 capacitor and a $200 service call, not a $5,000 power problem.
Your HVAC fuse is sized for a reason. Don't replace it with a higher amp fuse unless the manufacturer says so.
I went back and forth on this one for two weeks, so I understand the confusion. A mechanical interlock is a metal bracket that prevents the main breaker and generator breaker from being closed at the same time. It's cheap—usually under $200 in parts plus electrician labor. A transfer switch does the same job with a dedicated switch, and an automatic transfer switch does it without a human walking to the panel in the dark.
For a residential portable generator, an interlock is often the practical, code-accepted way to feed a few circuits. It's simple, and it's much safer than an extension cord backfeeding a dryer outlet. But for a data center or any load that needs to stay up during an unattended outage, I budgeted for an automatic transfer switch. The cost difference was about $3,800 in our 2024 project, including installation and electrical permits. That sum paid for itself the first time someone didn't have to drive to the site at 2 a.m.
The National Electrical Code (NFPA 70) and your local inspector are the real decision makers. A licensed electrician can tell you whether an interlock is allowed on your panel and whether your generator can handle the load.
Because that vendor is acting like a professional, not a salesperson. I've had a maintenance vendor tell me their techs are strong on Eaton UPSs but not on generator paralleling switchgear, and that I should bring in a specialty generator contractor for that part. That answer earned the next three years of their contract. The vendor who says "we can do absolutely everything" usually means they'll learn on your equipment and bill you for the lesson.
Per FTC advertising guidance, any claim like "guaranteed zero downtime" has to be substantiated. I don't trust that phrase from any vendor, and I've never seen Eaton use it either. A UPS is a machine. Batteries age, capacitors dry out, and human beings make mistakes during change windows. Real maintenance is about reducing the probability and minimizing the impact, not making magic promises.
This is also why I ask every vendor: "What do you refuse to do?" If they can answer quickly, I feel better. If they pause and say, "nothing we can't handle," I keep looking.