Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Installation and Operation Manual User Manual

Page 18

745-020-B0-003, Rev. C

1.0

System Overview, continued

1.4 Specifi cations, continued

Generator Set
Specifi cation

48VDC

Manufacturer:

Kohler

Dimensions (in/mm):

21.5"L x 20"W x 21.8"H/
546 x 508 x 554

Weight (lb/kg):

190/86

Rated* kW:

7.5

Rated Voltage
(after rectifi er):

52 ± 0.5VDC @ no load

Rated Amps:

144 @ 52VDC

* Derate approximately 4% per 1000 ft (300m) over
500 ft (153m) above sea level. Derate 1% for each
10ºF (5.5ºC) increase in temperature above 77ºF
(25ºC).

Generator
Specifi cations

48VDC

Stator Resistance
(ohms):

0.024

Stator Type:

3-phase, 3-lead,
ungrounded

Excitation Method:

Permanent magnet,
brushless

Coupling Type:

Direct-to-Engine

Insulation (stator):

Class 180,
epoxy varnish,
vacuum-impregnated

Winding Material:

Copper

Engine Specifi cations

Specifi cation

Manufacturer

Kohler

Make/model

CH20

Cycle

Compression Ratio

8:5:1

Displacement, cu. in. (cc)

38 (624)

Rated Horsepower
(using natural gas fuel)

13.1

Engine Speed (rpm):

2100-3450

Bore, in. (mm)

3.08 (77)

Stroke, in. (mm)

2.64 (67)

Valve Train

Overhead valve

Valve Material:
Intake
Exhaust

Steel
Stellite

face

Number of Cylinders

Cylinder Block Material

Aluminum with cast iron liners

Cylinder Head Material

Aluminum

Cylinder Head Tightening Torque, ft.
lb (Nm)

30 (41)

Piston Rings

2 compression, 1 oil

Crankshaft Material

Heat treated, ductile iron casting

Bearings:
Number
Type

2
Replaceable sleeve

Governor

Electronic

Starter Motor

Electric, 12VDC, solenoid shift

Lubrication System

Full pressure

Oil Capacity
(with fi lter and cooler), qt. (L)

2 (1.9 )

Oil Filter Tightening Torque

1/2 turn

Oil Pressure, psi (kPa)

25-35 (172-241)

Low Oil Pressure, psi (kPa)

3.5±1.5 (24.1±13.8)

Fuel Type

Natural gas or propane

Fuel Pressure, kPA (in. water)

7-11 (1.7-2.7)

Fuel Consumption at 7.5kW:
Natural Gas, 1000 BTU/ft.

Propane, 2516 BTU/ft.

150 cfh
50 cfh

Battery Voltage

12VDC

Battery Ground

Negative

Battery Recommendation (min.)

585 CCA @ 0ºF ( -18ºC)

Spark Plug Type
(Kohler P/N 24 132 02-S):

(Champion RC12YC)

Spark Plug Gap, in. (mm)

0.030 (0.75)

Spark Plug Tightening Torque, ft. lb
(Nm)

18-22 (24.4-29.8)

Ignition System

Capacitive discharge

Cooling System

Air cooled

High Engine Temperature, ºF (ºC)

305 (152)