jjrbus
FT Myers FL
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I have a new to me 02 Roadtrek on a Chevy chassis.
There is what looks to be a newer 4 post isolator,
I see no name brand or specs on it.
I have been RV'ing long time and never had an isolator before
and assumed they charged the vehicle battery when on shore power.
I am plugged in for a couple weeks
and everything is functioning properly.
My house battery is showing 13+ volts at the isolator terminal
and the vehicle battery is reading 12.25 volts at the isolator terminal.
Should this be charging the vehicle battery on shore power??
* This post was
edited 02/11/23 11:22pm by an administrator/moderator *
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Grit dog
Black Diamond, WA
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Joined: 05/06/2013
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I don’t know much about Cs but I wouldn’t think it typical
to charge the start battery off the RV converter.
Is it a voltage sensing isolator?
That latches and charges house battery when it sees charging voltage
from the vehicle. (IE vehicle running). Seems more plausible.
* This post was
edited 02/11/23 11:27pm by an administrator/moderator *
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wolfe10
Florida
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Most battery isolators charge both battery banks from the alternator when the engine is running.
Pretty easy to put your digital voltmeter on it and see whether it charges when the engine is running and/or when on shore power.
Yes, there are some battery combiners that will charge both banks anytime voltage is about a set level (indicating some charging source is on).
And, with any 19 year old vehicle, I would not ASSUME!
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240
Diesel RV Club:http://www.dieselrvclub.org/
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wa8yxm
Davison Michigan (East of Flint)
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Ok now the isolator is either a diode block (3 large posts one small and cooling fins) or a Solenoid (2 large posts two small ones)
First case: Diode iosolator: A diode is like a check valve on a water line. Current flows one way (The arrow points towards NEGATIVE or in this case the batteries) and the short charger cannot push power into the chassis battery.> Thankfully these are kind of rare.. though I have used them.
For the Solenoid... That's not the part that controls itself.. There is some means of controlling the solenoid.. Some are controlled by the alternator (If it's outputting the solenoid pulls in and charges) Most today are controlled by a computer... If it's the ECC (Engine Control Computer) than no.. there is no reverse charge
If it's an Intelletec Battery Control system or other type of B.I.R.D. (Bidirectional Isolator Relay Device) then yes.
How to tell the difference.
After a period of NOT PLUGGED IN (even 30 minutes to an hour will do)
Method 1: Turn on lights..then plug in and if say 1-5 minutes the lights brighten (I mean VEHICLE lights by the way) It's Bi-Directional
Method 2: (Better) Hook up digital voltmeter to a "Vehicle" test point.. You may have a fuse block under the dash or the battery itself.. NOTE voltage (Should be around 12.5 or 12.6) Now plug in and come back and see if it has gone up.. NOTE you may have to wait a short time (like 30min to an hour).. If it's now 13+ you have a Bi-Directional Isolator.
Method 3... IF the 12 volt accessory outlet in the dash is a "Chassis" device (often is) and hot with ignition off... There are plug in voltage indicators Some are digital Some are Multiple light...
Again if shore power charges the chassis. they will show an INCREASE if you plug in 30 minutes after shutting engine off.
I will save you some search time on that last option
https://www.amazon.com/Zeltauto-Cigarette-Lighter-Digital-Voltmeter/dp/B00VL9JZ0K/ref=asc_df_B00VL9JZ0K/?tag=hyprod-20&linkCode=df0&hvadid=312064685033&hvpos=&hvnetw=g&hvrand=15882270661183137423&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9017021&hvtargid=pla-568712381669&psc=1
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times
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Bobbo
Wherever I park
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When I had a Winnebago Class C motorhome, the chassis battery did not charge when plugged into the pedestal. After killing one chassis battery, I installed a Trik-L-Start to remedy that. I never had another problem with it. While that particular product appears to no longer be available, something similar should be.
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB
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theoldwizard1
SE MI
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First. Battery "isolators" are old school. With modern vehicle charging systems, you will never be able to achieve 100% SOC on your house battery bank no matter what size wire you use.
Get rid of your isolator and replace it with a DC-DC charger. No, this will not charge you vehicle battery. Go buy an inexpensive battery tender or carry jumper cables that can go from your house battery bank to your vehicle starting battery or buy one of those hand held battery boosters.
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jjrbus
FT Myers FL
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Thanks for the responses, greatly appreciated.
Upon checking this is a diode type unit and does not and is not suppose to charge the vehicle battery from shore power. I assumed it did and even though sitting for a while it has never failed to start, luck I guess.
My 94 Toyota had the old fashioned Cole Herse isolator, looked like a Ford stater solenoid. I added a switch to connect the house side to the vehicle battery and turned it on when on shore power. Can I add a simple switch and wires
to this isolator to connect batteries when on shore power?
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wolfe10
Florida
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jjrbus wrote:My 94 Toyota had the old fashioned Cole Herse isolator, looked like a Ford stater solenoid. I added a switch to connect the house side to the vehicle battery and turned it on when on shore power. Can I add a simple switch and wires to this isolator to connect batteries when on shore power?
Yes, you can add a solenoid-- common on most rigs and referred to as a battery boost or battery combine solenoid.
Be sure you get a CONSTANT DUTY solenoid rated at least 25% more than the max amp load it will be seeing.
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pianotuna
Regina, SK, Canada
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Joined: 12/18/2004
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Hi,
I added an addition solenoid rated at 200 amps continuous. For the starter battery I added a Trik-L-Start. Today I'd chose a dc to DC charger.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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jjrbus
FT Myers FL
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I do not understand why I would add a solenoid? Wouldn't I add a wire between the 2 battery terminals on the isolator with an inline 12 volt
switch??
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