cant charge my new Lithium upgrade

[2024traveler]

Does anyone that has a new 2024 Imagine 21bhe xls and have upgraded to lithium?? Supposedly this trailer is equipped with smart auto sensing technology inverter for lead or lithium. We have used it quite a bit over the last few months with no issue plugging into shore power. We just installed our new 300ah 12v lithium battery. What came with it was a 75ah lead acid battery. When I plug into shore power now to charge it the 30amp "battery disconnect" fuse blows. Almost like there is too much power now. I have tried 4 times with each fuse blowing in seconds. This lithium battery has a lot of power as it took me two weeks to drain it powering everything I could. The lead acid didn't even last a day. So I guess my trailer isn't so smart after all. Anyway Im hoping people have upgraded to lithium with this new trailer..

Thanks in advance

 

[triplethreat]

Welcome to the forum...looks like you are new here. You need to find out a couple of things about the battery issue...1st, I'm guessing you mean converter, not inverter. The converter is what normally charges the battery, taking 120VAC and "converting" it to a DC voltage which in turn charges the battery. When changing out to a LiFePO4 battery, they will charge at a high current rate, thus the fuse blowing every time you are trying to charge the battery.

So, you need to find out what size (in amps) that your present Converter/Charger is......probably a 55 am unit, but I'm guessing on that. The old lead acid battery would never tax the charger, the LiFePO will. If it's capable of putting out 55 amps, and your battery is low enough, it will try to feed the battery 55 amps. With a 30 amp fuse in place, that obviously is not going to work, as you've seen.

So first, find out the converter size. Second, you need to determine what size wire/cable is going from the converter to the the charging circuit for the battery. Ideally, it would be at least a 6ga. wire....but it may be smaller since that circuit is fused for 30A. For the charger to be able to charge the battery without blowing the fuse (if the charger is a 55 amp charger), you will need to go with a minimum of 6ga wire.....4ga would be even better. Then you would need to replace the fuse to a 55 or 60 amp fuse. If all of this is over your head, you will likely need to get someone that is knowledgeable to help you with this.

I'm also moving this thread to the proper location....Electrical Systems and Wiring.

 

[2024traveler]

Thank you, this was very helpful.

 

[triplethreat]

Thank you, this was very helpful.

Just as an example....I have a 302AH LiFePO battery that I built a few years ago. That battery has the "ability" to be charged at 150 amps....or half of the 302 AH rating. In my case, I have a 750W Converter/Charger that will produce 43.xx amps of current. When I am charging the battery and it is in Constant Current or bulk mode, I will almost always see 42.xx amps being drawn for charging. The amount of current being used is almost 100% of what the charger is capable of providing. If I had a 100 amp charger, that charge current would be in the 99.xx amp range.....as long as I had the proper size wire/cable for that much current and a fuse or breaker that would allow that much current flow

 

[Butcher]

Excellent response