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Old 03-16-2015, 06:13 PM   #1
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Generator and Shore Power

We have a 40 DP.
When connected to shore power, is it OK to start the generator and run it or should I disconnect prior to starting?
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Old 03-16-2015, 06:24 PM   #2
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It is much better to disconnect first as to not do so risks damage to your transfer switch.
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Old 03-16-2015, 06:26 PM   #3
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It suppose to be alright; But I don't anymore after replacing the voltage regulator on gen... I turn everything off and warm up the gen before switching over every time now...
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Old 03-16-2015, 06:31 PM   #4
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Shore power and generator

On most rigs, having shore power connected would not prevent you from starting and running your generator. However, running the generator while shore power connected is not recommended usually, as you may be burning gas / diesel fuel for nothing. Why do you want the run the generator with shore power connected?

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Old 03-16-2015, 06:47 PM   #5
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I start and run my generator all the time to exercise it in storage while plugged in.
Never had a problem.
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Old 03-16-2015, 06:47 PM   #6
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Typically doable. I do it when periodically exercising generator.

The caveat is to not switch with large loads active (such as air conditioning) due to possible damage to the transfer switch.
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Old 03-16-2015, 06:53 PM   #7
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Generator is normally the default state. So on shore power, starting generator, the ATS will switch to the generator. As someone mention, DO NOT DO THIS UNDER HEAVY LOAD. Both in starting and shutting down.
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Old 03-16-2015, 07:01 PM   #8
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Most transfer switches prioritize the generator when connected to shore power. Therefore after starting the generator the transfer switch will switch to the generator after about 30 seconds. As mentioned in previous post make sure the load is minimum to prevent the switch from burning out. Otherwise you can run the generator.
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Old 03-16-2015, 07:08 PM   #9
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The best preventive maintenance is to run the generator under as much a load as possible for an hour month according to the ONAN OEM rep.
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Old 03-16-2015, 07:25 PM   #10
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Anytime I start my generator, regardless of exercise or otherwise, I make sure there are no loads. Then turn things on after it's warmed up a few minutes.
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Old 03-16-2015, 07:37 PM   #11
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I learned a lesson the hard way, I was in a hurry to do my exercise the gen I had a electric heater running off shore power and forgot to turn it off before starting gen.. Well that lesson cost me 300.00 , it burnt the voltage regulator out on the gen . edumacation isn't cheap ! LOL I did learn another thing .... ASAP for genrator parts fast! If you don't load the gen up to at lest 1/2 power you aren't working it right run it hard. PA
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Old 03-16-2015, 07:42 PM   #12
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The generator IS the primary power source and shore power is the alternate. This is automatically taken care of via the transfer switch.
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Old 03-16-2015, 08:52 PM   #13
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When doing PDI on units I've had the shore power, generator and motor all going at the same time and never had a problem.
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Old 03-17-2015, 06:13 PM   #14
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Switching power, shore to generator

Okay, I did have my head in the wrong frame of mind. Yes, I agree with the above comments about only switching power sources with low or no power loads on the power buses. This is being conservative, but more importantly smart. While electric switching relays should handle whatever electrical loads are on the buses, when switching between shore power and generator power should done with only minor electrical loads.

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