Briggs & Stratton 076850 Liquid Cooled 48kW Fortress™ LPV/NG Standby Generator

A powerhouse designed for robust and reliable performance. This Briggs and Stratton 48kW Standby Fortress Generator is equipped with a formidable 4.3L Industrial Powertrain, 4-cycle engine, ensuring consistent power delivery and operational efficiency. With its advanced electronic governor and full-pressure lubrication system, it offers superior control and durability. The aluminum sound enclosure provides weather protection but also ensures quiet operation at a quiet 68 dB(A) at no load, making it ideal for both residential and commercial settings. Featuring an integrated control panel with real-time monitoring and diagnostics. Certified to meet UL and cUL standards, this standby generator is the perfect solution for ensuring uninterrupted power supply in any critical situation​

 

Briggs and Stratton 48kW Generator Features

InfoHub™ Wireless Monitoring

Lets you monitor your Generator’s status on your Computer, Tablet or Smartphone sending maintenance reminders so your Generator is always ready for the next power outage. Sold separately.

Symphony Choice Power Management

Manages the distribution of power to your selected Appliances automatically. Load management ensures the Briggs and Stratton Generator Fortress won’t Overload and Shutdown so your family can continue with its daily routine. Transfer switch and modules sold Separately.

Best in Class Warranty

Covers parts, labor and travel for the Full-length of the Warranty.

Made in USA

Briggs and Stratton Generators Assembled and Engineered in the USA with domestic and foreign parts.

Corrosion Protection

Reinforced, corrosion-resistant aluminum enclosures and bases with Dura-Zen™ coating for a long-lasting, attractive appearance.

Ratings & Compliance

The Briggs and Stratton 48kW Generator is rated in accordance with UL (Underwriters Laboratories) 2200 (stationary engine generator assemblies) and CSA (Canadian Standards Association) standard C22.2 No.100-14 (Motors and Generators).

Installations

You must Strictly comply with All applicable codes, industry standards, laws, regulations, and the provided installation manual. Running engines release Carbon Monoxide, an odorless, colorless, and poisonous gas. To ensure safety, keep exhaust gas away from any windows, doors, ventilation intakes, or crawl spaces. We strongly advise consulting the installation manual for additional guidance. This manual offers specific instructions for placing the Briggs and Stratton Fortress 48kW Standby Generator. Carefully consider and follow the stipulations of NFPA 37, which require businesses to install and maintain Carbon Monoxide Detectors. This step is crucial for safeguarding the well-being of everyone on the premises.

 

Specifications

OVERVIEW
Brand	Fortress™
Model Number	76850
Rated Countries	US / Canada
Rated AC Voltage (Volts)	120 / 240
Frequency (Hz)	60
Generator Breaker (Amps)	200
Operating Ambient Temperature (°C / °F)	-28 – 40 / -20 – 104
Running Amperage (LP / NG) (Amps)	200 / 187
Running Watts¹ (LP / NG) (kW / kVA)	48/48 / 45/45
Running Amperage – Continuous Duty International Use Only (LP/NG) (Amps)	160 / 149
Running Watts – Continuous Duty International Use Only (LP / NG) (kW / kVA)	38.4/38.4 / 36/36
Phase	1
Engine
Engine Brand/Manufacturer	PSI
Model Type	4.3L Industrial Powertrain, 4-cycle
Aspiration	Naturally Aspirated
Speed (RPM)	1800
Displacement (L / ci)	4.3 / 262
Compression Ratio	9.8:1
Rated Horsepower (gross hp)	82 LP / 78 NG
Governor Type	Electronic
Bore & Stroke (mm / in)	101.6 x 88.0 / 4.00 x 3.48
Number of Cylinders	6
Cylinder Arrangement	V6
Start Type	Automatic
Frequency Regulation Steady State, No Load to Full Load (%)	+/- 0.5
Frequency Regulation, No Load to Full Load	Isochronous
Air Filter Type	Dry
Low Oil Pressure Sensor	Yes
Low Coolant Sensor	Yes
Engine Block Heater	Yes
Engine – Output Deratings
Rated Temperature (°C / °F)	25 / 77
Rated Altitude (Above Sea Level) (m / ft)	366 / 1200
Temperature Derate	1.5% for every 5.6°C (10°F) above rated temp
Altitude Derate	2.5% for every 305m (1000ft) above rated altitude
Sound Rating²
No Load dB(A)	68
Air Induction System
Combustion Air (m³/min / cfm)	3.2 / 112
Lubrication System
Type	Full Pressure
Oil Capacity (L / qt)	4.3 / 4.5
Oil Filter (Quantity / Type)	1 / Cartridge
Cooling System
Cooling System Type	Radiator, Closed-Loop
Coolant Capacity (Engine Only) (L / qt)	7.3 / 7.8
Coolant Capacity (System Total) (L / qt)	22.7 / 24
Heat Rejected to Cooling Water at Rated Load (kcal/sec / BTU/min)	9.7 / 2300
Water Pump Type	Centrifugal
Electrical System
Ignition System	HVS Distributor
Battery Quantity	1
Battery Voltage (VDC)	12
Battery CCA (Amps)	775
Starter Motor Voltage (VDC)	12
Battery Charging Alternator
Ground (Negative / Positive)	Negative
Nominal Voltage (VDC)	12
Maximum Amperage (Amps)	70
Exhaust System
Exhaust Manifold Type	Dry
Exhaust Flow at Rated Load (m3/min / cfm)	10.3 / 362
Exhaust Temperature at Rated Load (°C / °F)	732 / 1350
Maximum Allowable Back Pressure (kPa / in Hg)	10.2 / 3.0
Fuel System
Fuel Type	NG / LPV
Fuel Supply Line Inlet	1” NPT
Recommended Fuel, Lower Heating Value Minimum (MJ/m3 / BTU/ft3)	NG: 34.3 / 904 LPV: 87.1 / 2338
Fuel Supply Pressure (mbar / in H₂O)	17-28 / 7-11
Fuel Consumption³
No Load, NG (BTU/hr)	181,000
No Load, NG (ft3/hr)	181
No Load, NG (m³/hr)	5.2
Half Load, NG (BTU/hr)	328,000
Half Load, NG (ft3/hr)	328
Half Load, NG (m³/hr)	9.3
Full Load, NG (BTU/hr)	511,000
Full Load, NG (ft3/hr)	511
Full Load, NG (m³/hr)	14.5
No Load, LP (BTU/hr)	165,000
No Load, LP (ft3/hr)	66
No Load, LP (m³/hr)	1.9
Half Load, LP (BTU/hr)	337,000
Half Load, LP (ft3/hr)	135
Half Load, LP (m³/hr)	3.9
Full Load, LP (BTU/hr)	533,000
Full Load, LP (ft3/hr)	214
Full Load, LP (m³/hr)	6.1
Alternator Specifications
Alternator Type	Self-Excited, 4-Lead
Alternator Manufacturer	Coliseum
Alternator Model Number	50BSPP-0
Frequency (Hz)	60
Exciter Type – Primary Alternator	Self-Excited
Insulation Rating (Class)	H
Designed Temperature Rise (°C)	125
Bearing (Quantity / Type)	1 / Sealed
Coupling	Flexible Disk
Amortisseur Windings	Full
Number of Poles	4
Voltage Regulator	Analog, 1-phase Sensing
Voltage Regulation, No Load to Full Load (%)	+/- 1.0
One-step Load Acceptance	100% of Rating
Total Harmonic Distortion (THD), No Load to Full Load (%)	< 5.0
Controls/Instrumentation
Controller Manufacturer	Briggs & Stratton
Controller	Briggs & Stratton
Charger	Integrated
Starting	AMF
Alternator Frequency	Yes
Real Time Clock	Yes
Single & 3-phase Sensing	No
Configurable Outputs	No
Configurable Inputs	No
Engine Maintenance Alarms	No
Engine Hour Counter	Yes
Engine Runtime Scheduler	Yes
Event Log	No
Web-based Monitoring	No
NFPA 110 Compliant (Battery Charger, Controller Upgrade)	No
Controller Features
True 3-phase Generator Sensing	No
Power Monitoring (kW, kVA, kVAR)	No
Remote Communications (RS232 & RS485) Capable	No
Configurable Inputs / Outputs	No
CAN Sensing	No
Configurable Display Languages	No
ComAp LiteEdit PC Software	No
Other Features
Battery Rack and Cables	Yes
Electronic, Isochronous Governor	Yes
Gas Fuel System	Yes
Integral Vibration Isolation	Yes
Oil Drain Extension	Yes
Operation and Installation Manual(s)	Yes
Aluminum Sound Enclosure	Yes
Accessories
Battery Charger, Marinco	No
Battery Charger, Sentinel	No
Controller Remote Communication Module, IL-NT GPRS	No
Controller Remote Communication Module, IB-LITE	No
Controller Remote Communication Module, IL-NT RS232-485	No
Controller Remote Communication Module, IL-NT S-USB	No
Remote Annunciator, RA-15	No
Remote Display, IL-NT RD	No
Emergency Stop Switch, NEMA 4X	No
Emergency Stop Switch, w/ Cover	No
Local Emergency Stop Switch	6491-00
Battery Warmer	6343-00
Battery Cable Lockout	6335-00
Engine Communication Cable	6350-00
Controller Communication Cable, USB-A to USB-B	6428-00
Controller Communication Cable, RS232 Null Modem to USB-A	No
Maintenance Kit	6514-00
Limited Warranty4
Warranty: Generator, Domestic (Parts / Labor / Travel) (Years)	6
Warranty: Generator, International (Parts / Labor / Travel) (Years/Hours)	N/A
Warranty: Engine, Domestic (Parts / Labor / Travel) (Years)	6
Warranty: Engine, International (Parts / Labor / Travel) (Years)	N/A
Warranty: Enclosure, Surface Rust and Corrosion (Parts / Labor / Travel) (Years)	1
Warranty: Enclosure, Rust Through (Parts / Labor / Travel) (Years)	3
Certifications
UL	Yes
cUL	Yes
Weights & Dimensions
Assembled Dimensions (Length x Width x Height) (in / mm)	91 x 39.4 x 41 / 2311 x 1001 x 1041
Assembled Weight (lbs / kg)	1634 / 741
Packaged Dimensions (Length x Width x Height) (in / mm)	103.9 x 48 x 50.4 / 2638 x 1219 x 1280
Packaged Weight (lbs / kg)	2033 / 922

 

Installation and Operation Manual

Parts Manual

Warranty

Specsheet