Business UPS Power Electronics Overhaul & Load Verification

Rebuilding typically costs significantly less than an OEM replacement pack, especially for larger rack-mount or industrial UPS units with proprietary battery trays. We provide a quote after evaluating the pack condition and cell count. For common business UPS models, rebuilt packs offer substantial savings over new OEM packs.

Standard battery pack rebuilds complete in 3-7 business days from intake to verified return. Complete UPS units requiring both battery work and electronics repair may take 7-14 business days depending on parts availability and the extent of board-level faults.

Age alone does not disqualify a UPS. The constant beeping typically indicates failed batteries or a charging fault both repairable. If the chassis is solid, the transformer and inverter are intact, and replacement parts are available, an older UPS can be restored to reliable service. We evaluate each unit individually.

Often yes, but the batteries will almost certainly need replacement after extended storage. The electronics may also need capacitor reconditioning or replacement if they have degraded from disuse. We assess the full unit and provide a restoration quote.

Yes. If you have identified that only the battery pack needs rebuilding and the UPS electronics are functioning, you can ship just the battery tray or module. Include the UPS model number so we can match the correct cell specifications.

Battery packs are heavy and require careful packaging. Use a double-wall box rated for the weight. Wrap the pack in plastic to contain any possible leakage, surround with at least 3 inches of firm foam padding, and seal securely. Always check your carrier's regulations for shipping batteries some types require hazmat labeling.

Corroded or burnt harness components can often be replaced as part of the rebuild. We replace damaged wiring, connectors, and fuses within the battery pack. If the corrosion extends into the UPS chassis connector, the chassis-side connector may also need replacement we advise during diagnosis.

Minor enclosure damage (cracked plastic, broken clips) can sometimes be repaired or worked around. If the enclosure is severely damaged and no longer provides safe containment for the cells, we advise against rebuilding and recommend sourcing a replacement tray or complete pack.

A constant beeping with a red fault light usually indicates either a dead battery pack (the UPS cannot hold charge) or an internal electronics fault (failed inverter, charger fault, or overload). If the UPS is more than 2-3 years old and has never had batteries replaced, the batteries are the likely culprit. If the beeping started suddenly after a power event, the electronics may be damaged. We diagnose both possibilities.

This is almost always a battery problem. The self-test applies a brief load that degraded batteries can handle momentarily, but sustained discharge drains them almost immediately. New batteries should restore full runtime. If the problem persists after battery replacement, there may also be a charger fault the old batteries were never being fully charged.

Rapid relay clicking (chattering) during transfer indicates the UPS is oscillating between line and battery mode, which can damage the transfer relay and connected equipment. This is often caused by a failing control board or unstable inverter output. Do not leave equipment connected to a chattering UPS it can cause power fluctuations that damage sensitive electronics.

Yes. If the transfer relay is welded, stuck, or its coil has failed, the UPS will not switch to battery mode when utility power drops even if the batteries are fully charged. The UPS will simply shut off, defeating its purpose. Relay testing is part of our UPS electronics diagnosis.

The UPS model is usually printed on a label on the front, side, or rear of the unit. The battery pack part number (often starting with "RBC" for APC units) is typically on a label attached to the battery tray or cartridge itself. If you cannot find either, a clear photo of the UPS and the battery pack helps us identify them.

Note any displayed error codes, LED flash patterns, or audible beep sequences before disconnecting the unit. For network-managed UPS units, check the management interface for logged events. This diagnostic information gives us a head start on identifying the fault.

We use programmable load banks that simulate real equipment draw resistive, inductive, or a mix depending on what the UPS typically powers. Testing with a realistic load profile reveals issues that a simple light-bulb test would miss, such as waveform distortion or voltage sag under inrush conditions.

A no-load test only confirms that the UPS produces output voltage it does not verify that the inverter can sustain a real load. A UPS can pass a no-load test and still fail the moment you plug in a server or network switch. Load-bank testing is essential for a reliable return-to-service decision.

We run the test until the UPS reaches its low-battery shutdown threshold at the specified load level. For units intended for extended runtime, this may take an hour or more. The test confirms both battery capacity and the UPS's ability to sustain output through the full discharge cycle.

Yes. The repair report includes the test load used (in watts or percentage of UPS rating) and the actual measured runtime. This gives you a concrete number for capacity planning you know exactly how long your equipment will stay up during an outage.

Run a self-test at least quarterly. Most UPS units have a built-in self-test function (often activated by holding the power button). For critical systems, schedule a manual runtime test every 6 months under real load. Discovering a dead battery during an actual outage is a preventable failure.

The battery charge indicator estimates capacity based on voltage, but old or sulfated batteries can show full voltage with almost zero actual capacity like a car battery that reads 12V but cannot crank the engine. A discharge test reveals this "voltage vs. capacity" deception.

Signs include the battery compartment door being difficult to close, visible bulging of the UPS case, or a chemical/sulfur smell near the unit. If you suspect swollen batteries, do NOT force open the compartment. Contact us for guidance on safe handling and shipping.

Yes. Leaked electrolyte can drip onto the UPS mainboard, corroding traces and components. If your batteries have leaked, the UPS electronics need inspection even if the unit still appears to work corrosion damage can progress over time and eventually cause failure.

Yes. A noisy or failing fan is a straightforward replacement. However, a fan that has been failing for a while may have allowed heat damage to accumulate on the inverter board or capacitors. We inspect the surrounding components for thermal stress when replacing the fan.

We do not recommend it. UPS units contain large capacitors that retain a dangerous charge even when unplugged. Additionally, the fan voltage, connector type, and airflow direction must match the original specification. An incorrect fan can cause overheating or circuit damage. Let us handle it safely.

Yes. For multi-site fleets, we can establish a rotation where units are pulled, rebuilt, and redeployed on a schedule minimizing downtime at each location. We handle the logistics of receiving units from different sites and shipping rebuilt units to their assigned destinations.

Each unit is serialized at intake with your asset tag or our tracking number. Throughout the rebuild process battery pack assembly, electronics diagnosis, final testing the unit stays linked to its asset record. Return shipping labels reflect the original site or a new destination per your instructions.

Yes. We can build and store a rotating spare pool of rebuilt UPS units. When a unit fails at one of your sites, we ship a rebuilt replacement immediately while the failed unit comes back to us for rebuilding and enters the pool. This keeps your sites protected without waiting for a repair cycle.

A workable spare pool typically starts at 3-5 identical units: one in the field, one ready as a spare, and one being rebuilt. Larger fleets benefit from scale. We can help size the pool based on your failure rate and acceptable downtime window.

Add up the maximum power draw (in watts) of all equipment connected to the UPS. If the total exceeds 80% of the UPS rating, the unit is undersized and even a fresh battery will provide limited runtime. In this case, upgrading to a higher-capacity UPS may be more cost-effective than rebuilding the existing unit.

We can advise on capacity requirements based on your equipment load, but OHMz does not sell new UPS units. We provide the specifications you need to source a correctly sized replacement from a vendor.

Yes. Rebuilt battery packs are covered by a warranty on the replacement cells and assembly workmanship. UPS electronics repairs are covered by an OHMz workmanship warranty on the specific components replaced. Full warranty terms are provided with your rebuild documentation.

You receive a serialized rebuild report including: battery cell specifications and date of manufacture, measured runtime at a defined load, electronics diagnosis findings and work performed, replaced component list, and final test results. This documentation supports your asset management and compliance records.