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Cummins/Onan — 18

For these Cummins/Onan models: EGMBT, EGMBT (P4500), EGMBU, EGMBU (P5000E), EGMBU (P5000e), P24500 (Spec A), P5000e (Spec A).

Applies to: Cummins Onan Egmbt, Cummins Onan Egmbu

Procedure

  1. 4. Starting and Running the Generator Set Reciprocating Saw 1200 2000 Refrigerator/Freezer 700 1500 Security System2 500 - Space Heater 1800 - Stereo Receiver 450 - Sump Pump 800 1200 Table Fan - 14" 200 400 Television - 27" 500 - VCR/DVD Player 100 - Water Well Pump - 1/3 HP (220V)2 1000 2000 Window Air Conditioner - 10,000 BTU 1200 2200 1The wattage values listed in this table are based on estimated wattage requirements. For exact wattage, check the data plate or the operator's manual for the item you wish to power. 2These units are usually hard-wired and require a professionally-installed transfer switch. NOTE: Ratings apply to altitudes up to 1000 feet (304.8 m), 85oF (30oC). Total power available will decrease 3.5% for each 1000 feet (304.8 m) above 1000 feet and 2.0% for each 10oF (5.5oC) increase in ambient temperature above 85oF (30oC).
  2. 1. Make sure the tools and appliances to be connected are rated for the voltages at the generator set power output receptacles.
  3. 2. Note the kW rating on the generator set nameplate.
  4. 3. Check the power draw (watts) of each tool or appliance to be connected. Table 1 lists typical tool and appliance ratings in watts.
  5. 4. Add the watt ratings of all the loads that the generator set will be powering at the same time. Make sure that total wattage will not exceed the generator kW rating. Example: A generator set rated 5 kW (5000 watts) can power two 1500 watt heaters, a 900 watt circular saw, a 500 watt drill, and a 100 watt light at the same time (4500 watts altogether). However, to operate a second 900 watt saw, it will be necessary to disconnect one of the 1500 watt heaters. NOTE: A motor draws much more power when starting up than when running. It may be necessary to power fewer tools or appliances when motors and air conditioners are cycling on and off. CAUTION: Excessive power draw can overload the generator set. A motor draws much more power when starting up than when running. It may be necessary to power fewer tools or appliances when motors and air conditioners are cycling on and off.
  6. 5. Connect the AC power cords to the appropriate receptacles on the control panel. See Grounding.
  7. 4.5.3 High Altitude Maximum power decreases roughly four percent every 1000 feet (310 meters) of increase in elevation above sea level. When operating the generator set at altitudes above 1000 feet, it may be necessary to power fewer loads at the same time. 914-0508 (Issue 5) 19

Source: manual:914-0508 Onan EGMBT P24500 EGMBU P5000e (spec A) Portable Genset Service manual (10-2009).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.