Mitsubishi Electric SUMMIT Series UPS (silicon carbide), 500 and 750 kVA

Mitsubishi's silicon carbide UPS holding about 98% in true double conversion without ever leaving VFI operation

Mitsubishi Electric SUMMIT Series UPS (silicon carbide), 500 and 750 kVA is one of 22 UPS systems tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Mitsubishi Electric SUMMIT Series dossier: 500 and 750 kVA silicon carbide UPS, 98% in true double conversion with no eco mode, specs, and market timing.

Why it matters

SUMMIT is the strongest available argument that efficiency and topology are separable. Holding about 98% in permanent VFI removes that trade, and the 97.9% figure at quarter load on the 500 kVA unit is where the difference actually shows up in a lightly loaded hall.

Who buys it

Large data center and industrial buyers optimizing for double-conversion efficiency at partial load and for reduced heat rejection and floor space, and operators unwilling to accept an eco-mode transfer in the design. The buyer profile for a used SUMMIT does not exist yet, since none have reached the secondary market.

Role in the data center

Megawatt-adjacent primary UPS where partial-load efficiency, heat rejection and floor space govern the selection and an eco-mode transfer is unacceptable.

Key specifications

Technical summary

Ratings: 500 kVA/500 kW and 750 kVA/750 kW, unity output power factor Input: 480 V, plus 15% and minus 20%, 60 Hz plus or minus 10%; input PF above 0.99 lagging Output: 480 V, 60 Hz within 0.01% regulation Efficiency (500 kVA): 97.9 / 98.2 / 98.0 / 97.5% at 25/50/75/100% load Efficiency (750 kVA): 97.6 / 97.8 / 98.0 / 97.9% at 25/50/75/100% load Topology: three-level, full silicon carbide power modules, true online double conversion Dimensions: 79.4 in W x 33.6 in D x 80.4 in H at 3,072 lb (500 kVA); 101.8 in W at 4,290 lb (750 kVA) Heat rejection: 42.0 kBTU/hr at 500 kVA; 62.9 kBTU/hr at 750 kVA Battery: VRLA, VLA, pure lead and lithium-ion (Lithium Ready), separate enclosure Standards: UL 1778, CSA 22.2 (cUL), IEEE 587, ANSI C62.41-1991, ISO 9001

Pricing and availability

Trend: up Lead time, new: Quote-only through MEPPI and its distributors. 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 sales through MEPPI and distributors such as Unified Power, all quote-only. No secondary channel exists yet: eBay, Surplus Record, Critical Parts Warehouse, Global Power Supply, CI Group and USA Decommissioning all returned nothing.

Regional notes

North American 480 V, 60 Hz product listed to UL 1778 with cUL recognition, manufactured and supported from MEPPI's Pennsylvania operations.