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04-29-2017, 09:31 AM
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#1
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Member
Join Date: Apr 2013
Posts: 56
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Battery voltage
Was wondering why on my cs 3953 the voltage differs from shore to engine power.
Engine off I get about
13.1 on chasis
12.9 on house
Engine on
14.0 on chasis
13.9 on house
I just do not know enough yet about this complex electrical system.
Or plumbing, ac, water, etc.
Thanks for all the help I get by reading this forum
__________________
Bobby And Myrna, 2014 Newmar Canyon Star 3953
5 Star Tune, CHF, Maxim Sumo Springs, Blue Ox Rear Trac Bar, Roadmaster Steering Stabilizer, RV Comfort System Heat, Magna Shade Sun Screen, Victron Battery Monitor
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04-29-2017, 09:37 AM
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#2
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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Probably because your alternator is charging your batteries at 14.7 volts which is normal
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[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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04-29-2017, 12:44 PM
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#3
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: Aug 2015
Posts: 3,180
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Anything above around 12.6v (sitting idle, no load) is coming from somewhere...
The chassis...Alternator, Small Solar panel on the roof.
The house...Inverter Charger (Shore or Generator), possibly aftermarket SOLAR.
Then the trick...the two can be joined together by the bi-directional relay when certain conditions are met.
Extra reading, if interested.
http://www.intellitec.com/assets/pdf...-00362-000.pdf
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Charlie & Ronni
2016 Ventana 4037
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04-29-2017, 01:03 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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Your shore power readings indicate the charging system that operates when on shore power is in float or minimum charge mode. To avoid overcharging that would result in electrolyte loss from the battery cells.
With the engine started , the chassis battery has been drawn down by the load of the starter and the alternator is running a higher charge rate to build the battery back up.
I see nothing unusual about your readings , are you having a specific problem ?
If you turn on a number of interior lights in the coach , the shore power charging system should , ramp up to cover the added load.
For more info visit this site.
The 12volt Side of Life (Part 1)
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-29-2017, 01:26 PM
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#5
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Member
Join Date: Apr 2013
Posts: 56
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Thanks to all for the replies. Skip, I am not having a specific problem, just was curious about the difference. Since I left my lights on the first night out I am a little anxious about batteries and such. No fun having to get a boost on day number 2.
__________________
Bobby And Myrna, 2014 Newmar Canyon Star 3953
5 Star Tune, CHF, Maxim Sumo Springs, Blue Ox Rear Trac Bar, Roadmaster Steering Stabilizer, RV Comfort System Heat, Magna Shade Sun Screen, Victron Battery Monitor
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04-29-2017, 03:12 PM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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The 0.1 /0.2 volt difference , could just be from the length of the charge wire to the batteries ; and shouldn't be a problem.
You say you had to get a boost ?
Isn't your coach equipped with a " Boost " or "Emergency Start " button on the dash ?
There are many links in the " Sticky " posts in the top of the list in the Newmar owners forums , that can help you understand your coach's systems.
Look at " Quick Mods and Easy Fixes 1,2 & 3 " for information on all things Newmar.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-29-2017, 03:16 PM
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#7
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Member
Join Date: Apr 2013
Posts: 56
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Yes it does have a battery boost button. May I just used it wrong but I pushed it and it did not help.
Held it down to start but still nothing. Looking back maybe I should have held it down for a while to let it charge up some.
__________________
Bobby And Myrna, 2014 Newmar Canyon Star 3953
5 Star Tune, CHF, Maxim Sumo Springs, Blue Ox Rear Trac Bar, Roadmaster Steering Stabilizer, RV Comfort System Heat, Magna Shade Sun Screen, Victron Battery Monitor
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04-29-2017, 03:22 PM
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#8
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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There may be an issue with where the boost switch gets it's power . If the switch needs power from the chassis battery and it was totally dead , then you'd have no operation of the interconnect relay.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-29-2017, 03:24 PM
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#9
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Member
Join Date: Apr 2013
Posts: 56
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If I remember correctly the panel above the door showed about 8.5 volts on the chassis battery.so that is dead dead
__________________
Bobby And Myrna, 2014 Newmar Canyon Star 3953
5 Star Tune, CHF, Maxim Sumo Springs, Blue Ox Rear Trac Bar, Roadmaster Steering Stabilizer, RV Comfort System Heat, Magna Shade Sun Screen, Victron Battery Monitor
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04-29-2017, 03:31 PM
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#10
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Quote:
Originally Posted by Memphisbobby
If I remember correctly the panel above the door showed about 8.5 volts on the chassis battery.so that is dead dead
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If it were mine, Plug it in and let the batteries charge up, and if no shore power, start the genset and run it for a couple of hours to put a charge back in those batteries. Trying to charge them all with the engine's alternator will put a big load on it and it will really get hot........and this will take the life right out of it...........
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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04-29-2017, 03:42 PM
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#11
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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Quote:
Originally Posted by Memphisbobby
If I remember correctly the panel above the door showed about 8.5 volts on the chassis battery.so that is dead dead
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That could easily have been dead enough ; that the interconnect wouldn't work.
Anything below 11volts will shut down a lot of systems .
BTW: I carry a set of jumper cables , long enough to reach from the coach batteries to my toad ( my batteries are behind the right rear wheels ) so I can jump start the toad without unhooking it , or vice versa. But on the coach all the batteries are on one tray so easier ; unless both sets of batteries were dead; to join the banks together, with the cables.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-29-2017, 03:43 PM
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#12
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Member
Join Date: Apr 2013
Posts: 56
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Skip, I do now
__________________
Bobby And Myrna, 2014 Newmar Canyon Star 3953
5 Star Tune, CHF, Maxim Sumo Springs, Blue Ox Rear Trac Bar, Roadmaster Steering Stabilizer, RV Comfort System Heat, Magna Shade Sun Screen, Victron Battery Monitor
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04-29-2017, 03:46 PM
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#13
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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Quote:
Originally Posted by Memphisbobby
Skip, I do now
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Safe travels.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-30-2017, 01:06 PM
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#14
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Senior Member
Newmar Owners Club Freightliner Owners Club Carolina Campers
Join Date: Apr 2013
Posts: 112
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I always use the Battery Boost switch to gang the house and chassis batteries together on engine start. If we are not plugged into shore power, I bring the generator on-line before starting the chassis engine. Induction heaters can put a significant load on the chassis electrical system until temperature is reached so I hold the Boost switch until the induction heater stops cycling.
Happy travels!
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DC3Carl
Carl and Gayle and Bandit
2012 Dutch Star 4342
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