Mitsubishi Electric 9900AEGIS Series, 80-225 kVA

Mitsubishi's current 80-225 kVA transformerless UPS with a published 15-year capacitor life and lithium-ready path

Mitsubishi Electric 9900AEGIS Series, 80-225 kVA is one of 22 UPS systems tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Mitsubishi Electric 9900AEGIS dossier: 80-225 kVA, 96.9% efficiency, 15-year capacitor life, lithium ready, and how to tell it apart from the older 9900A.

The 9900AEGIS is Mitsubishi Electric Power Products' current transformerless three-phase UPS, rated 80, 100, 150, 160 and 225 kVA at 0.90 power factor on a 480 V input and output. It uses an advanced three-level IGBT design in true online double conversion, publishes measured efficiency at every load point from 93.4% at quarter load on the 80 kVA unit to 96.9% at three-quarter load on the 225, and parallels up to four modules. MEPPI states a 15-year capacitor life on the data sheet, which is an unusually specific durability claim for this category. One disambiguation governs every listing: the 9900A is a different, older model in the same 80-225 kVA band, and MEPPI lists it as best-effort support with a projected end of December 2026, with the 9900AEGIS named as its replacement. Nearly every priced secondary listing in this band is a 9900A rather than an AEGIS, so a listings pipeline has to key on the nameplate model code in the UP9933A family rather than on the seller's title text. Battery choice drives residual value more than anything else on this platform. The unit is marketed as Lithium Ready with a BCL04-CB lithium cabinet alongside BC43 and BC55 VRLA cabinets, and MEPPI's own chemistry guidance runs VRLA at three to five years, pure lead to seven, VLA and 20-year VRLA to fifteen, and lithium-ion at fifteen to twenty-five. A genuine lithium cabinet carries materially more residual value than a five-year-old VRLA string.

Why it matters

The 9900A versus 9900AEGIS distinction is worth tens of thousands of dollars on a 225 kVA unit and it is invisible in most listing titles. One machine is in active support with full parts availability; the other drops to best-effort support around December 2026. Surfacing nameplate model codes rather than seller titles is the difference between an accurate index and a misleading one.

Who buys it

Data center, healthcare and institutional buyers in the 80 to 225 kVA band, particularly those needing the UL 924 emergency-lighting listing available on the 80 and 100 kVA units or an OSHPD-listed build. On the secondary side, buyers in this band are almost always shopping the predecessor 9900A, which is where the priced inventory actually is.

Role in the data center

Room-level and facility-level primary UPS in the 80 to 225 kVA band, paralleled to four modules, with an external VRLA or lithium-ion battery cabinet.

Key specifications

Technical summary

Ratings at 0.90 PF: 80/72, 100/90, 150/135, 160/144 and 225/202.5 kVA/kW Input: 480 V, plus 15% and minus 20%; output 480 V within 1% balanced Battery bus: 480 VDC nominal, 400 VDC minimum, float to 600 VDC Efficiency at 25/50/75/100% load: 93.4/95.6/96.4/96.6% at 80 kVA; 95.7/96.8/96.9/96.8% at 225 kVA Topology: transformerless, advanced three-level IGBT, true online double conversion Parallel: up to 4 modules Footprint: 27.6 in W x 32.8 in D x 80.6 in H (35.4 in W at 225 kVA); 772-1080 lb Heat rejection at full load: 8.6 to 22.8 kBTU/hr across the range Battery: VRLA, VLA, NiCd and lithium-ion; Lithium Ready with the BCL04-CB cabinet Standards: UL 1778; UL 924 on 80 and 100 kVA; CSA 22.2; IEC 62040-3; OSHPD

Pricing and availability

Comparable secondary-market band: 151–499 $ per kVA. Trend: up Lead time, new: Quote-only through MEPPI and its distributors. Lead time, used or refurbished: 1-4 weeks on the predecessor 9900A. Warranty, used: 1-year typical from refurbishment dealers.

Lifecycle and maintenance

Static UPS cabinets serve roughly 15 years, the figure Mitsubishi publishes directly alongside a lifecycle-parts-or-replace decision at 10-12 years. The wear items are documented: Eaton rates DC bus capacitors at 7 years of continuous duty and up to 10 under favorable conditions, while Vertiv field data gives 6 years for capacitors and 5-6 years or 40,000-50,000 hours for cooling fans. Batteries turn over far faster, at 3-5 years for sealed VRLA and 12-15 for flooded cells. Service life extension programs rebuild the power train inside the original shell, which is why cabinets routinely outlive their electronics.

Common failure points

• Battery strings — VRLA capacity fades below 80% of nameplate and takes the ride-through with it
• DC bus capacitors — Silent open-circuit loss, or a short that pops and sprays electrolyte across adjacent boards
• Cooling fans — Overheating transfers the load to bypass and leaves it unprotected
• Air filters and dust — Restricted airflow raises internal temperature and shortens capacitor life
• Static bypass switch — Failure to transfer strands the load during maintenance or overload
• Controls obsolescence — Discontinued display and logic boards turn a routine repair into a scavenger hunt

Inspection checklist

Battery age — sealed VRLA turns over at 3-5 years per Eaton lifecycle guidance; assume a full string past that Battery capacity — reject any string below 80% of nameplate capacity under IEEE 1188 practice Battery impedance — ohmic readings above 20% of the commissioning baseline condemn the cell Float voltage — verify 2.23-2.27 VPC at 25 degrees C; float current above 3x steady state flags thermal runaway Intercell connectors — thermal image every joint; a delta above 5 degrees C against neighbors triggers a capacity test DC bus capacitors — Eaton rates 7 years of continuous duty (10 optimal); Vertiv field data gives 6 years at 45,000-50,000 h Cooling fans — Vertiv field data gives 5-6 years or 40,000-50,000 hours; listen for bearing noise at the intake Air filters — pull every filter; a clogged element is the best single proxy for a cabinet that ran above 25 degrees C Load bank test — run 100% and 50% load bank steps; load banking is the de facto acceptance standard in this channel Static bypass — transfer to bypass and back under load 3 times; verify the SCR assembly and breaker interlocks Battery inclusion — get cells, cabinets and racks in writing; a battery package can reach 76% of a 30 kVA class deal Firmware and cards — verify current firmware and a working network card per Eaton's 11-point used-UPS guidance Lifecycle stage — check OEM support status; Mitsubishi's 4-stage table is the only dated public one in the category Documentation — manual, factory startup report and service history; Eaton flags 7-10 year units for capacitor work Removal conditions — verify rigging path, door widths and shutdown window; a 225 kVA cabinet runs 3,605-4,805 lb

Procurement channels

New units through MEPPI distributors including Unified Power, Dataglobe Canada and Altruent, all quote-only. Secondary inventory in this band comes through CI Group, Global Power Supply, USA Decommissioning and Critical Parts Warehouse, and is predominantly 9900A rather than AEGIS.

Regional notes

North American product at 480 V, listed to UL 1778 with CSA 22.2 recognition and an OSHPD path. MEPPI manufactures and services from Pennsylvania with a recently expanded California service centre.