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Old 08-01-2015, 08:13 AM   #1
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Onan 3.6KW LP vs the Chassis Diesel to charge the coach batteries

Figured I would put this in this part of the forum since it sorta relates to MBS. If the moderator feels it should be under the Tech Talk section, I can resubmit

Odd discussion with an RV technician the other day. He suggested it is more effective and efficient to use the MBS to charge our coach batteries vs the Coach's Onan Genset. He said if you were running the AC or the Microwave sure use the gen to also charge the batteries. However, if you are only needing to charge then use the MBS. He said the Amps/Volts are much higher coming from the MBS' Alternator. Does this make any sense to you MBS lovers?

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Old 08-01-2015, 12:40 PM   #2
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Originally Posted by MarsMan View Post
Figured I would put this in this part of the forum since it sorta relates to MBS. If the moderator feels it should be under the Tech Talk section, I can resubmit

Odd discussion with an RV technician the other day. He suggested it is more effective and efficient to use the MBS to charge our coach batteries vs the Coach's Onan Genset. He said if you were running the AC or the Microwave sure use the gen to also charge the batteries. However, if you are only needing to charge then use the MBS. He said the Amps/Volts are much higher coming from the MBS' Alternator. Does this make any sense to you MBS lovers?

If you are driving I would agree with tech. Idling the MBS engine for extended periods is rough on the emission system and that can get expensive. Shore power is the most efficient, when available.
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Old 08-01-2015, 09:31 PM   #3
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Originally Posted by MarsMan View Post
Figured I would put this in this part of the forum since it sorta relates to MBS. If the moderator feels it should be under the Tech Talk section, I can resubmit

Odd discussion with an RV technician the other day. He suggested it is more effective and efficient to use the MBS to charge our coach batteries vs the Coach's Onan Genset. He said if you were running the AC or the Microwave sure use the gen to also charge the batteries. However, if you are only needing to charge then use the MBS. He said the Amps/Volts are much higher coming from the MBS' Alternator. Does this make any sense to you MBS lovers?

"RV technician" couldn't even tell you the output on the MB alternator. Granted it's a heavy duty, but I bet he has no clue. Also, output amperage fluctuates with rpm's, so you should sit in the drivers seat and race the engine. He has no idea what he's talkikng about.

Like others said, charge batteries like that in flight, otherwise use the genny.
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