Eaton 9355 Repair & Service
MPEI repairs, services, and maintains the Eaton 9355 three-phase UPS, formerly the Powerware 9355, for commercial and industrial sites across KwaZulu-Natal and nationwide. If your 9355 is throwing a fault, losing runtime, or simply due for maintenance, we keep it running.
We are based in Durban with technical coverage across KZN and Gauteng.
A mature unit worth keeping
The 9355 is a proven three-phase platform, and there are many still in service protecting critical loads every day. As a unit ages, the parts that wear are predictable, and they are still available. Do not let anyone push you into replacing a 9355 that can be repaired for a fraction of the cost of a new system. We will assess yours honestly and tell you whether it is worth keeping or genuinely at end of life.
Common 9355 faults we fix
Capacitors ageing out, normal on any unit running for years
Cooling fan failures and overheating
Batteries reaching end of life and losing runtime
Charger and rectifier faults
Inverter and bypass faults
Display, communications, and monitoring faults
We diagnose the actual cause, not just the warning light, so you are not paying to replace parts that are still good.
Battery replacement
The batteries are the part of a 9355 that wears out first. Sealed lead-acid batteries typically last three to five years, less in a hot room, and a UPS with tired batteries gives you almost no real runtime when the power goes. We test the bank with impedance testing, tell you exactly where it stands, and replace it with the correct cells, restoring your full runtime. We work with trusted brands including Fiamm, CSB, and Yuasa.
What we do
Eaton 9355 repair and fault diagnosis
Battery testing, supply, and replacement
Preventative maintenance contracts (SLA)
Emergency callouts
Accessories: battery cabinets, stands, breakers, temperature sensors, custom battery links
Why MPEI
We are an independent specialist, so our job is to keep your unit working, not to sell you a new one you do not need. You deal with one accountable contractor from diagnosis to repair, not a chain of branches. We are based in Durban, serving KZN and clients nationwide, with fast response. And as a Level 1 B-BBEE company, we are the straightforward choice for commercial and corporate procurement.
Get your 9355 looked at
Tell us what it is doing and what it protects, and we will tell you what it needs.
Call 031 100 2679
WhatsApp 078 515 4731
Email service@powerinfrastructure.co.za
