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Post by riobob on Sept 2, 2024 11:50:12 GMT -5
On other forums and on threads, I find many references to the LiFePo4 batteries having alternator charge issues where the BMS shuts down charge. In looking at the wire configuration on my Venture SN231 It would appear that when this happens, for whatever the disconnect within the bms happens, there is no functioning Break Away voltage at the trailer.
Have others solved this question?
Is there actually an issue with the vehicle alternator in today's vehicles?
thanks
Advice appreciated.
Bob
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Post by riobob on Sept 24, 2024 9:27:04 GMT -5
I did not receive a reply on any of the 4 forums. In an effort to be compliant with my TT I have installed a break away battery and charge box from e-trailer. The 3 wire install eliminated the 'risk' associated with LiFePo4 battery disconnecting. There were 3 wires, I cut the red wire to the break away switch, black to the side from the trailer, blue to the side (red) to the switch and white to ground, this allows the battery in the box to charge from the vehicle or TT converter but on break away my trailer electric brakes have a dedicated power source. this box has a test button on top that will be a check on my checklist. Attachments:
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Post by spiderbobr on Sept 25, 2024 8:41:07 GMT -5
I have not gotten into the lithium batteries as yet, so I'm still trying to wrap my mine around what you are saying. I have heard that a lot of automotive chargers have a problem charging the batteries but, what does your rewiring have to do with the. break-a-way switch, should not the battery still operate that switch when needed?
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Post by riobob on Sept 25, 2024 19:06:58 GMT -5
that was what i posted, seems there are a number of posts on other sites that indicate yes and others no, D.O.T. would not answer yes or no , in order to assure myself, I installed the power system for the brakes. I do not have a good way to test, and since many farm trailers (horse, cattle and flat beds) where i live use these units i figured this is a risk free way to be comfortable.
the Battery Management System disconnects charge with over voltage, my understanding is that is 14.8V in most cases so if it is cold and the alternator cranks out 15.5 not sure if the batteries are available or disconnected. With this unit I am safe.
again not worth any additional risk to me.
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Post by riobob on Oct 8, 2024 10:56:04 GMT -5
there are a number of posts on the rv forums and the gmc/chevy forums that indicate a brake issue with the tow vehicle. The GM reply is to disconnect the solar converter. With lithium batteries at 14.6 this is a likely error by GM engineers. What is needed is a blocking diode at the 12 volt supply from the tow vehicle. Most likely not gonna be the gmc fix. So if you are towing with a gmc vehicle, you have a couple of solutions. the large blocking diode could be installed on your Trailer, 12 v in on one side and the other connected to the rv, this will then allow safe operation of the break away. I choose the seperate battery and re-rout the tow vehicle charge to that battery, leaving my solar in tact. There is a recall on the break controller in 2500/3500 series but i am guessing that is also a bandaid since the 14.6 from the LiFePo4 batteries could still back feed. Advice, do your research. gmauthority.com/blog/2024/07/gm-to-fix-chevy-silverado-hd-intermittent-trailer-brake-loss-issue/ |
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Post by spiderbobr on Oct 9, 2024 9:01:56 GMT -5
I just recently. bought a new tow vehicle 3500, which uses a Lithium battery as the chassis battery. I didn't realize until after buying the vehicle that it didn't have a brake controller. I'm now in the process of trying to have the controller installed as a factory item. They are giving me the runaround for this. It seems the dealer keeps getting information from the manufacture that doesn't follow previous information. Perhaps the brake controller along with the brake a way switch is part of the conversation. I'm going to pursue this with the dealer and see where it goes.
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Post by riobob on Oct 30, 2024 10:03:22 GMT -5
i have the breakaway and 12 volt from the tow vehicle isolated from my lithium. after reading all the crazy gmc stuff i wanted to ensure all was safe towing. the lithium are solar charged so not worried on their condition figure the 12 volt from the tow vehicle would charge the break away.
Of note there are posts where folks installed a blocking diode on both the 12 volts and brakes at the travel trailer to ensure no feedback.
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