Overview#
The MTU 12V2000 DS800 is an 800 kW diesel standby generator set powered by the MTU 12V2000G85TB — a 23.9-liter, 12-cylinder V-configuration turbocharged and charge-air-cooled diesel engine producing up to 890 kWm (1,194 bhp) gross at 1,800 rpm. The engine uses electronic unit pump (EUP) injection — a different fuel system architecture from the common rail injection used in the 1600-series and 4000-series platforms — governed by the MTU ADEC isochronous controller at ±0.25% speed regulation.
The DS800 is a significant step up from the 1600-series in multiple dimensions. It carries EPA Tier 2 certification and is unique in the MTU diesel standby line in offering 4,160V medium-voltage configuration in addition to standard 208–600V three-phase — making it suitable for medium-voltage distribution systems in industrial plants, hospitals, and large commercial facilities.
The prime rating is 725 kW. The Leroy-Somer LSA 49.1 alternator series is used at this power level. Standard equipment includes a unit-mounted radiator rated for 50°C ambient, a dedicated intercooler (aftercooler) water pump circuit independent of the jacket water pump, 24V electric start with 2,800 CCA (four 8D batteries), and the MTU digital control panel with NFPA 110 compatibility and IP 54 front panel protection.
Technical Specifications#
Power Ratings (60 Hz, 1800 rpm, 0.8 PF)
| Rating | kW | kVA |
|---|---|---|
| Standby | 800 | 1000 |
| Prime | 725 | 906 |
Engine — MTU 12V2000G85TB
| Parameter | Value |
|---|---|
| Displacement | 23.9 L (1,457 in³) |
| Configuration | 12-cylinder V |
| Aspiration | Turbocharged and charge-air-cooled |
| Fuel injection | Electronic unit pump (EUP) |
| Rated speed | 1800 rpm |
| Governor | ADEC electronic isochronous, ±0.25% |
| Max gross power | 890 kWm (1,194 bhp) |
| Emissions | EPA Tier 2 |
| Starting | 24V electric, 2,800 CCA |
Fuel Consumption (Diesel #2)
| Load | Consumption |
|---|---|
| 100% load | 59.0 gph (224 L/hr) |
| 75% load | 45.0 gph (168 L/hr) |
| 50% load | 30.0 gph (114 L/hr) |
Physical (Open Power Unit)
| Dimension | Value |
|---|---|
| Length | 4,674.75 mm (184 in) |
| Width | 2,292 mm (90.24 in) |
| Height | 2,341.3 mm (92.18 in) |
| Dry weight | 7,883 kg (17,379 lb) |
Cooling System
| Parameter | Value |
|---|---|
| Radiator ambient rating | 50°C (122°F) |
| Water pump capacity | 833 L/min (220 gpm) |
| Aftercooler pump capacity | 258 L/min (68 gpm) |
| Heat rejection to coolant | 315 kW |
| Heat rejection to aftercooler | 270 kW |
| Heat radiated to ambient | 82.1 kW |
Our Service Experience#
The MTU 12V2000G85TB is a bridge platform between the smaller 1600-series and the massive 4000-series, and it introduces several service considerations that are distinct from other MTU diesel platforms. The electronic unit pump (EUP) injection system is not interchangeable with common rail components — technicians must be trained specifically on EUP diagnostics and replacement procedures.
The separate intercooler water pump is a critical service point. Unlike the 1600-series, the 2000-series has a dedicated aftercooler circuit with its own pump — inspect both the main jacket water pump and the aftercooler pump at every service interval. A failed aftercooler pump seal can go undetected until charge air temperatures rise and the ADEC controller begins reducing power.
At 17,379 pounds and nearly 15.5 feet long, this unit requires significant structural planning. Expect engineered pad design, rigging with a 10-ton crane minimum, and access considerations for the exhaust system — at 800 kW, the exhaust back-pressure limit is only 8.5 kPa (34.1 inches of water column).
Frequently Asked Questions#
What is the fuel injection system on the DS800? The 12V2000G85TB uses electronic unit pump (EUP) injection — not common rail like the 1600-series or 4000-series. EUP requires MTU-specific tooling for diagnostics and unit pump replacement. Do not assume common rail diagnostic procedures apply.
Is 4,160V medium voltage available on the DS800? Yes. The DS800 is available in 4,160V medium-voltage configuration in addition to standard 208V through 600V three-phase. This makes it one of the few units in the MTU diesel line to offer medium voltage without a separate transformer. The 13.8kV and 12.47kV options seen on the 4000-series are not available on the DS800.
What starting system does the DS800 require? 24V electric start with 2,800 total cold cranking amps. This requires four group-8D batteries in a 24V configuration. All four batteries must be load-tested at every service interval; replace in complete sets when any battery fails the load test.
What warranty does the DS800 carry? 2-year standard limited warranty through MTU Onsite Energy authorized distributors.
