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Old 02-07-2015, 12:53 PM   #15
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I should amend what I said by starting the engine first, heck with the engine running that will charge your house batteries. Generator will do it quicker though.
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Old 02-07-2015, 12:56 PM   #16
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why do they put the generator on the house battery and not the chassis battery?your house battery is always the one to run down.
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Old 02-07-2015, 01:02 PM   #17
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I am going to suggest not to use the engine's alternator to charge dead battery banks..........by design, it is suppose to Maintain them.............not charge them from a "Dead"state...........you will over heat the windings and take a lot of life out of it, if not ruin it!
Find a way to start the genset and let the converter charge them back up.......or replace.
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Old 02-07-2015, 01:11 PM   #18
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Quote:
Originally Posted by Chuck48 View Post
I should amend what I said by starting the engine first, heck with the engine running that will charge your house batteries. Generator will do it quicker though.
WHEW! LOL

A couple thoughts on previous experience with a similar situation. While he COULD start the genny simply by using the emergency start switch, the house batteries MAY need to be charged up to somewhere around 11.5V to keep it running. On a couple occasions on my previous Winnebago with a GAS 5.5 KW generator I got it started after charging the batteries but because of what turned out to be a bad converter the batteries lost power and eventually shut the generator off.

HOWEVER...I'm not sure that would be the same case in a diesel generator though. It was just something that came to mind.
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Old 02-07-2015, 01:16 PM   #19
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why do they put the generator on the house battery and not the chassis battery?your house battery is always the one to run down.
I suspect that in concept it is like the fuel cut off point to avoid draining the fuel tank because of generator use. By design the purpose is the protect the chassis first. I would think that in a worse case scenario you want the ability to start the engine and take the coach to a service place vs being totally stranded.
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Old 02-07-2015, 01:34 PM   #20
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Yes, if your fuel tank drops below the generator pick up pipe, no workie.
I suggest the BLM rangers may know of reputable mobil RV service providers.


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Old 02-07-2015, 02:00 PM   #21
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palehorse89 said,
..........by design, it is suppose to Maintain them.............not charge them from a "Dead"state...........you will over heat the windings and take a lot of life out of it, if not ruin it!

An alternator is designed to output it's full output at 6000 RPMs. Normally that is at the cruising RPM of the engine.

If it is a 150 amp alternator it will output 150 amps. At idle or slightly above it will output around half of that. In either case it will not overheat the windings and take life out of it.

The large alternators in MHs are designed to handle the charging duties of the batteries in it.

With nothing else around, it is a great way to charge a run down battery bank.
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Old 02-07-2015, 02:28 PM   #22
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Quote:
Originally Posted by twinboat View Post
palehorse89 said,
..........by design, it is suppose to Maintain them.............not charge them from a "Dead"state...........you will over heat the windings and take a lot of life out of it, if not ruin it!

An alternator is designed to output it's full output at 6000 RPMs. Normally that is at the cruising RPM of the engine.

If it is a 150 amp alternator it will output 150 amps. At idle or slightly above it will output around half of that. In either case it will not overheat the windings and take life out of it.

The large alternators in MHs are designed to handle the charging duties of the batteries in it.

With nothing else around, it is a great way to charge a run down battery bank.
I have to "Respectively" disagree with you on this, my post is from a first hand experience and a alternator failure doing just this in a big truck with 2 big batteries...........it is your money and your equipment.......use it and spend it as one sees fit. Some reading for you ........
Fact: Alternators are not designed to charge dead batteries | OPTIMABATTERIES
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Old 02-07-2015, 03:16 PM   #23
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We used to jump our dead trucks and let them charge, all the time.




Some reading for you.






https://amplepower.com/products/bdbc/index.html
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Old 02-07-2015, 03:30 PM   #24
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We used to jump our dead trucks and let them charge, all the time.




Some reading for you.






https://amplepower.com/products/bdbc/index.html
And this is what you have in your Coach? Damn, what a charging system

Thank you for the reading, don't think it applys to dead batteries though.......and the systems. Glad it has always worked for you with no problems
Bio-Diesel Battery Chargers ...DC Amps Generators ?
The OP's alternator is a A/C generator converted to DC........Like most Alternator's......
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Old 02-07-2015, 03:42 PM   #25
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Work better then the car alternator link, you sent to me.


If you read it on the Internet, it must be true.


Have a good day
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Old 02-07-2015, 04:08 PM   #26
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Originally Posted by twinboat View Post
Work better then the car alternator link, you sent to me.


If you read it on the Internet, it must be true.


Have a good day
Not everything Twinboat..............have to sifer through it and learn, like I said, I had experienced a failure, this is the reason for my suggestion, I learn from mistakes.........as usually , they cost me money, and I now pass my lesions on in case I can help others.
Maybe this will work better for ya HOW DOES AN ALTERNATOR WORK?
Maintenance Tips/Suggestions: Have the alternator?s drive belt tension
checked at every oil change. A loose belt can reduce alternator output and
run down your car?s battery. Each spring, prior to travel season, it?s wise
to have your car?s charging system tested as part of a comprehensive
starting, charging and battery test. This test will determine whether your
car?s alternator is putting out the proper amount of current and voltage.
Your car?s alternator is designed to recharge the battery after slight
discharging such as engine starting; and maintaining them, the alternator is not designed for
charging heavily discharged (?dead?) batteries. Relying on the alternator to
charge a heavily discharged battery can overload the alternator and cause
damage. In such cases, use a battery charger instead. An alternator
problem can cause a discharged battery, poor accessory and light
operation, frequent bulb replacement, repeat voltage regulator failures,
erratic engine operation, or a dashboard warning light to illuminate. To
pinpoint the cause, have your car?s charging system checked out by a
qualified service technician. Life expectancy of the average alternator is
75-100 thousand miles.
I am done now, Have a great day also........
Dean(OP), Have you been able to get help? or get the genset going?
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Old 02-07-2015, 04:28 PM   #27
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Thanks to all of you regarding my low voltage house battery issue

Quote:
Originally Posted by twinboat View Post
Work better then the car alternator link, you sent to me.


If you read it on the Internet, it must be true.


Have a good day
Quote:
Originally Posted by Dean B View Post
I have a 2006 Monaco Diplomat that has the Magnum Energy panel and 8 Kilo generator that has the "Auto Generator Start"mode. I'm dry camping and for the past few days the generator will automatically come on charging the house batteries when voltage drops. Sometimes it would start automatically but a few times I had to start it manually myself. By the way the AGS is set on "Enable". Today I left for a few hours only to return to low batteries too low to induce the inverter to provide AC. I tried to manually start the generator but it wouldn't turn over apparently too low of voltage in batteries (11.0). I started the engine to the coach thinking that reving the engine for a while at around 1000 RPM's would build up enough voltage to the house batteries. It didn't do a whole lot (maybe I didn't let engine run long enough). Therefore, I'm sitting in the dark and will wait for daylight tomorrow. Are there any thoughts out there what the problem might be? Appreciate you reading this thread.
I purchased a set of good battery cables and jumped from the starting batteries to the house batteries. Let engine run about 1/2 hour and bingo, the generator started. It has been running about an hour and 15 minutes and is showing a voltage at the house batteries at about 13.7V. I'm going to run the generator for about 6 hours and see if it bring them up. I believe my problem was that I never let the generator run long enough to build up enough stored voltage in the house batteries. It never went beyond bulk charge meaning the voltage probably never got greater than 13V. I now will let it run until it continues from bulk to absorption and then to float. I just hope that as A/C power is used the generator will automatically start when voltage drops to where the AGS will cut in. Thanks everyone for your input, irv2.com is great!!
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Old 02-07-2015, 04:35 PM   #28
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Quote:
Originally Posted by Dean B View Post
I purchased a set of good battery cables and jumped from the starting batteries to the house batteries. Let engine run about 1/2 hour and bingo, the generator started. It has been running about an hour and 15 minutes and is showing a voltage at the house batteries at about 13.7V. I'm going to run the generator for about 6 hours and see if it bring them up. I believe my problem was that I never let the generator run long enough to build up enough stored voltage in the house batteries. It never went beyond bulk charge meaning the voltage probably never got greater than 13V. I now will let it run until it continues from bulk to absorption and then to float. I just hope that as A/C power is used the generator will automatically start when voltage drops to where the AGS will cut in. Thanks everyone for your input, irv2.com is great!!
Glad to hear that you got it going Dean! So you have a volt meter with you? If so, after charging them, see what the voltage is after shutting off the genset. Thanks for the up date!
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