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Old 06-09-2024, 04:10 PM   #1
JohnnyB1966
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DC (display commander) battery voltage shows only one is charged

I have a really new 2023 Keystone Cougar 24SABWE. The Display Commander (DC) shows the battery voltage. Although we have two 100AH lithium batteries connected in parallel to power the trailer, the DC just shows the voltage of the first battery ("B1 13.5 V") and shows the second battery with 0.0 or 0.1 volts ("B2 0.1 V"). We don't have any kind of power problem, and I am just wondering if this is normal, and that what we are seeing is the combined voltage of both batteries displayed on the monitor. It is OK that the second battery voltage is not showing a charge?

I also use the VictronConnect iphone app. Its "SmartShunt" page (which shows the battery status) does not distinguish the two batteries - it just shows the overall charge of 13.48 V, and seems to indicate all is good.

So, what is going on?
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Old 06-09-2024, 04:51 PM   #2
RollaMo
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If your two batteries are 12volt, then they are connected in Parallel.

So, your display and even the Victron app just sees them as "One" battery.
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Old 06-09-2024, 04:59 PM   #3
chuckster57
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Are the trailer leads on opposite batteries?
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Old 06-09-2024, 05:45 PM   #4
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If you are asking does the postive (red) on one battery lead to the trailer, and the negative (black) on the other battery also lead to the trailer, the answer is yes. Not being a battery expert, I think this is the correct way to wire a parallel battery connection. Thanks!
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Old 06-09-2024, 05:53 PM   #5
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Quote:
Originally Posted by JohnnyB1966 View Post
If you are asking does the postive (red) on one battery lead to the trailer, and the negative (black) on the other battery also lead to the trailer, the answer is yes. Not being a battery expert, I think this is the correct way to wire a parallel battery connection. Thanks!
Yes, thatís the best way to wire up 2 12V batteries.
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Old 06-10-2024, 05:50 AM   #6
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Quote:
Originally Posted by JohnnyB1966 View Post
If you are asking does the postive (red) on one battery lead to the trailer, and the negative (black) on the other battery also lead to the trailer, the answer is yes. Not being a battery expert, I think this is the correct way to wire a parallel battery connection. Thanks!

that doesn't tell much actually and sounds like you are wired in series. if you have 12v batteries both positives have to connect together and go to the rv, and both negatives have to go together to the ground.

if you are wiring two 6V to make a 12v then yes the positive of one goes to the positive of the trailer, the negative of the other goes to ground and in-between the positive of one is hooked to the negative of the other.

here are a couple pics showing the difference I found on the net.
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Old 06-10-2024, 06:08 AM   #7
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I asked because some people with 2 12V batteries wire them in series and hook the trailer leads to one battery.
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Old 06-10-2024, 03:03 PM   #8
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If you have two 12 V batteries connected in parallel, it's impossible (without a level of chicanery you won't find outside a lab) for a meter to differentiate between the voltage of one battery and the voltage of the other.
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Old 06-10-2024, 04:38 PM   #9
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They are definitely in parallel. I think I now have an answer to my question. The trailer sees the parallel set of batteries as a single battery. Thanks.
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Old 06-10-2024, 04:41 PM   #10
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I would suspect your second set of leads from inCommand aren't even connected to anything, as there would be nothing to connect them to.
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Old 06-11-2024, 05:38 AM   #11
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I asked because some people with 2 12V batteries wire them in series and hook the trailer leads to one battery.
oh my, I have never seen that thank god haha.. the biggest thing I see is parallel and hooked to on battery so it isn't a balanced setup but that's just an inefficiency not a real big issue. or 6V wired in parallel when people up grade from the crappy dual 12v that the rv dealer sells them to 6V deep cycles
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Old 06-11-2024, 07:23 AM   #12
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My new Cougar doesn't have InCommand, but when I set up my Victron Smart Shunt, with 2 100ah LiFePO4 batteries, it says to add the capacity together, so it is setup as a 200ah battery. If they are connected in parallel, I don't see any way that each battery could be monitored individually.

What you are likely seeing is a one-size-fits-most approach with the system readings. For example, on units with an onboard generator, having two separate battery monitors would be expected, one for the generator starting battery and the other for the house batteries. Since you don't have a generator, the second battery status is like an appendix, it's there, but doesn't do anything for you.
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Old 06-11-2024, 09:42 AM   #13
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Originally Posted by NH_Bulldog View Post
My new Cougar doesn't have InCommand, but when I set up my Victron Smart Shunt, with 2 100ah LiFePO4 batteries, it says to add the capacity together, so it is setup as a 200ah battery. If they are connected in parallel, I don't see any way that each battery could be monitored individually.

What you are likely seeing is a one-size-fits-most approach with the system readings. For example, on units with an onboard generator, having two separate battery monitors would be expected, one for the generator starting battery and the other for the house batteries. Since you don't have a generator, the second battery status is like an appendix, it's there, but doesn't do anything for you.
Sort of the same as the "generic control panels" in trailers without In-Command. For the most part, the panels have a status indicator with two gray tanks, two black tanks and 1 fresh water tank. On trailers with only one gray tank or only one black tank, the "left over status indicator" isn't used, but may light none of the LED's or may light all of the LED's... Unlike the automobile industry where they design in a blank panel insert for things not included, the RV industry just leaves it there for new owners to wonder why it's there.....
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Old 06-16-2024, 08:01 AM   #14
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Originally Posted by JohnnyB1966 View Post
They are definitely in parallel. I think I now have an answer to my question. The trailer sees the parallel set of batteries as a single battery. Thanks.
IDK what type of BMS your batteries have, but my LiFePos have a bluetooth BMS, and I can read the state of each one from that.
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