mkevenson
No camping, sheltered in place, soooooo time to fiddle with the trailer.
I have a lithium battery that I charge with a 3rd party charger designed for all batteries including lithium. I also have the stock converter/charger that is charging the battery. I have been told by the battery dealer that the lithium battery is smart and will not be overcharged. The reason I am using the dedicated charger is to take the lithium battery to 100% charge which I have been told by will not be done by the stock charger in the trailer. Also to allow a maintenance ( trickle) charge which the Retro charger does not do.

In an attempt to limit charging with only the 3rd party charger, I installed a battery disconnect switch. When the switch is off the battery is isolated from the trailer but still being charged by the dedicated charger. All is good so far, UNTIL, I add a battery monitor which has one hot lead going from battery + to the monitor and one wire going from the - side of the battery to the monitor. With this wiring scheme, the battery disconnect switch is bypassed and the trailer is no longer isolated from the battery, thus allowing both battery chargers to charge at the same time. Any ideas as to how I can use everything properly.
Hope that you all are safe in these trying times.
Mark
Please buy Made in USA
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sunvalleyjoe
sound like you need to be at Yucca Flats when you try it out!! Got my humor from a fellow Retro owner who lives in Santa Rosa area!!! Take care GBA!!SVJ
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mkevenson
YUUUUUUCA flats? HAAAAA HAAAAA. Polishing the baby mooooons! We are safe so far. Amazon is our friend, if a bit slow, these days. Wonder if I'll remember which ile my favorite food is on when we get released!
Mark
Please buy Made in USA
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sunvalleyjoe
quite in our area .we have all the grand kids our property is completely fence and back 1/3 is all theirs bike riding and sno sledding before it melted take care my friend and stay safe. GBA!!!!!!!SVJ
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2ty
Mark, Lithium batteries have an extremely low self discharge rate as compared to Lead/Acid varieties. If your battery switch completely disconnects it from any external loads then there is no need of a maintenance charger.  Running that charger for a few hours every 4 or 5 months should sufficient.  You are correct that most OEM chargers that are designed for Lead/Acid batteries will not fully charge your Lithium battery, however most work fine when used to maintain a Lithium because Lithiums in storage are happiest when partially discharged anyway!  That gives you 2 choices; disconnect but top off periodically, or leave it connected and use the OEM charger to maintain it partially charged.  I don't understand how the monitor would bypass the disconnect switch from the trailer loads, more explanation of your wiring is needed.
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mkevenson
2ty, thanks for your comment. Ahh the battery disconnect switch, another problem for an amature like me. I am using a battery monitor, provided by the lithium battery company , Relion . It is wired directly to the Neg post of the battery as well as to the pos. post from whence it gets power for the display. When the monitor is included in the circuit, the battery switch is not effective in isolating the battery from the trailer. I have spent a lot of time on this project including phone conversations with the Relion tech rep. His final comment was that I have everything wired correctly and should go to a PRO for help. A liability issue, I suspect. Easier said than done, in this community. I have taken the disconnect switch out of the equation .
Mark
Please buy Made in USA
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2ty
Evidently, your battery monitor is more than a simple voltmeter, probably a unit that includes a current shunt to measure AH in/out of the battery.  In order to accurately measure voltage, it SHOULD be connected directly to the battery to avoid seeing the voltage drops that would occur, under load, in the disconnect switch and associated wiring.  I just looked at the Relion monitor manual.  The shunt is on the negative side of the battery and there is a small wire to the positive side to power the monitor and provide a voltage sample to it.  If your disconnect switch is on the positive side and the small wire connects directly to the battery then there shouldn't be a problem.  The OEM charger and the trailer loads will be isolated from the battery.
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mkevenson
Yes, it has a shunt. Neg cable that went to battery now goes to shunt.
Other side of shunt now goes to neg battery terminal. Positive lead from battery pos terminal to shunt. This is a Relion battery monitor. Schematics and wiring on relion.com. so if I under standard your post, better to put the battery disconnect on the positive cable coming from the battery?
Mark
Please buy Made in USA
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mkevenson
Relionbattery.com
Mark
Please buy Made in USA
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2ty
My feeling is that it is better to keep all of the monitor wiring on the same side of the switch.  Since the small wire should be connected directly to the battery (+) then it follows that the switch should be on the (+) side between the battery and the trailer leaving the small wire connected to the battery (+).  This will leave a very small load on the battery but will otherwise isolate the battery from the trailer loads and the OEM charger.  You should recharge the battery just before a trip and every few months otherwise.
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