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Old 04-12-2014, 03:30 PM   #1
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6 Volt Batteries

I just put a pair of 6 volt deep cycle batteries in my 2014 2903 Bay Star. When I plug it in my shop to either a 15 amp or 20 amp it makes that sort of thump noise. It then has almost a small humming noise from the compartment where the cord is. Not in the coach itself just by the compartment. It is a 50 amp cord from my MH to a pigtail to the outlet in the shop. I think I am repeating myself but want to be sure the noise I hear is normal and that I am not doing any damage to the unit. Should not make a difference 12 volt to 6 volt should it? Plug in and charge? Thanks again for helping me!
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Old 04-12-2014, 03:34 PM   #2
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Sounds like you have batteries hooked up wrong,
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Old 04-12-2014, 03:53 PM   #3
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What Batteries were in it and by did you add batteries? Take a pic or make a drawing of your current set up, take a pick of drawing and post it here. And yes, its a big difference!
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Old 04-12-2014, 04:19 PM   #4
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6 Volt Batteries

I replaced 2 12 volt deep cycle batteries with 2 Trojan T-105 deep cycle 6 volt batteries. I was told when camping with out power they would hold a charge longer. I put all positive to one battery and all negative to the other battery. These have another post on each battery that I put a jumper on from positive to negative. Does that sound correct? Lights, water pump etc. seem to work fine so I assume it is all right. Let it sit for a 1/2 a day and then drove it in and plugged it in. My other batteries also made a thumping noise but I did not notice a humming noise. It is a very slight humming noise and I really don't know if the 12 volt batteries had the same noise or not. Definitely had the thumping noise though.
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Old 04-12-2014, 04:26 PM   #5
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The thumping noise is the transfer switch, most likely the humming noise is too. The relays in the transfer switch can hum. If you're not popping your 15 or 20A breaker you're fine.
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Old 04-12-2014, 04:26 PM   #6
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Who ever told you replacing 2-12 volt deep cycle batteries with just 2-6 volt
batteries is wrong in almost all cases.
If 4-6volt batteries were used then yes a big difference.
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Old 04-12-2014, 04:29 PM   #7
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Sounds like you did it correct correctly. If you have a Surge protector, that's the noise you hear thumping. The surge protector maybe humming. You are putting more amps into those batteries than your other ones, they are rated 225 Ah.

I think you are just fine.
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Old 04-12-2014, 04:31 PM   #8
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Old 04-12-2014, 04:35 PM   #9
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Old 04-12-2014, 04:36 PM   #10
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Hi roadtraveler,
Consider going to The 12volt Side of Life (Part 1)
Scroll about 1/3 of the way down the page. There will be a diagram showing you how 2 6 VDC batteries should be connected. Next to the 6 VDC diagram there will be a diagram for 12 VDC batteries. If your 6 VDC batteries are connected as in the diagram, you are good to go. The humming is what has been previously posted. My transfer switch and/or charger hums when connected to low voltage supply.
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Old 04-12-2014, 04:46 PM   #11
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My transfer switch hums because it doesn't know the words.
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Old 04-12-2014, 04:46 PM   #12
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Quote:
Originally Posted by GaryKD View Post
Hi roadtraveler,
Consider going to The 12volt Side of Life (Part 1)
Scroll about 1/3 of the way down the page. There will be a diagram showing you how 2 6 VDC batteries should be connected. Next to the 6 VDC diagram there will be a diagram for 12 VDC batteries. If your 6 VDC batteries are connected as in the diagram, you are good to go. The humming is what has been previously posted. My transfer switch and/or charger hums when connected to low voltage supply.
Thanks you for your help. I did call Newmar and they confirmed so all is well I think. They said 2 - 6 volt is equivalent to 3 + 12 volt batteries. I hope so! Thanks again.
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Old 04-12-2014, 04:52 PM   #13
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Hi roadtraveler,
You are very welcome.
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Old 04-12-2014, 05:36 PM   #14
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Quote:
Originally Posted by roadtraveler View Post
I just put a pair of 6 volt deep cycle batteries in my 2014 2903 Bay Star. When I plug it in my shop to either a 15 amp or 20 amp it makes that sort of thump noise. It then has almost a small humming noise from the compartment where the cord is. Not in the coach itself just by the compartment. It is a 50 amp cord from my MH to a pigtail to the outlet in the shop.
roadtraveler

DISCLAIMER: the following information does not mean there is nothing wrong with your coach!

I have owned my coach for 14 years and I tell you that the noises you describe are normal, (on my coach).
It has always sounded "sort of thump noise", (from the compartment where the inverter/charger and tranfer switch live), when I plug into, or turn on, shore power, (whether 15, 20, 30, or 50 amp).
When shore power is going to my coach I can hear a constant "small humming noise from the compartment", (and always have).

If you did not hear the "thump" and "hum" before you changed the batteries there may be something wrong.

Mel
'96 Safari, 132k miles
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