Lithium Battery/Charger Question

[coglesby]

The cable goes from the converter/charger to the breaker/fuse panel then from the breaker/fuse panel to the battery cutoff switch then from the cutoff switch to the auto reset breaker then to the battery. Based on that what is the estimated length of cable?

 

[coglesby]

was the 0.9V drop measured at the same time 23A was flowing. With #6 that seem like too much drop. Please verify the wire gauge for each run which should be stamped on the cable.

From your measurements there is no voltage drop across the battery cutoff so removing it won’t help

 

[TexasToyTrike]

The cable goes from the converter/charger to the breaker/fuse panel then from the breaker/fuse panel to the battery cutoff switch then from the cutoff switch to the auto reset breaker then to the battery. Based on that what is the estimated length of cable?

My best estimate is that it’s 10-12’. I’m estimating because I would have to drop the poly and unscrew the base of my bed to SEE all of the wire.

 

[coglesby]

That seems like excessive voltage drop but bottom line is you can solve the lower charge current by simply moving your converter or battery to minimize the distance.

On the WFCO, if you unplug from shore power and plug back in with a full battery it will drop back into lead acid mode. If I were you I’d insist on the jumper.

 

[TexasToyTrike]

That seems like excessive voltage drop but bottom line is you can solve the lower charge current by simply moving your converter or battery to minimize the distance.

On the WFCO, if you unplug from shore power and plug back in with a full battery it will drop back into lead acid mode. If I were you I’d insist on the jumper.

Appreciate the recommendations. I will certainly do a test to charge up the battery to 100% and the unplug and then reconnect to see what happens with the Lithium profile mode. I’ll let you know the results.

I understand what you are suggesting about moving the charger and battery closer together. This 30g trailer really has VERY limited space to do that. The power distribution (charger) is located in the front bedroom dresser drawers with a small pocket of space behind it. The battery is mounted on the A frame. It has no basement storage area and the generator is mounted under the bed. The one (and only) small side storage area would actually be further away. It’s the one thing I really don’t like about this trailer

If I could rewire the trailer with 4 awg wire, wouldn’t that effectively accomplish the same thing as shortening the wire (moving charger and battery closer together). Wouldn’t this lower resistance of the wire between the two?

 

[coglesby]

Yes it would. For 15’ of wire and 55A you’d get 0.5v drop with #4, 0.4V with #3 and 0.3V with #2.

 

[coglesby]

Appreciate the recommendations. I will certainly do a test to charge up the battery to 100% and the unplug and then reconnect to see what happens with the Lithium profile mode. I’ll let you know the results.

I understand what you are suggesting about moving the charger and battery closer together. This 30g trailer really has VERY limited space to do that. The power distribution (charger) is located in the front bedroom dresser drawers with a small pocket of space behind it. The battery is mounted on the A frame. It has no basement storage area and the generator is mounted under the bed. The one (and only) small side storage area would actually be further away. It’s the one thing I really don’t like about this trailer

If I could rewire the trailer with 4 awg wire, wouldn’t that effectively accomplish the same thing as shortening the wire (moving charger and battery closer together). Wouldn’t this lower resistance of the wire between the two?

I misspoke. It only returns to lead acid mode if you disconnect battery and shore power. So if you have the battery disconnect key removed and unplugged shore power, it’ll return to lead acid mode.

Edit: at this point I’m not sure what the conditions were, I just know it reverted to lead acid. Interested to see what happens if you just unplug and replug shore power. I have the lithium jumper now so I can’t do any testing