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Lithium battery charging

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 Joe
(@Joe)
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Joined: 1 year ago
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Topic starter  

Hey Mike, what do you think would be the best way to charge my Lithium batteries in my RV while on the road? I think I may need to install a specific converter to charge them while driving as from what I understand my current one is not optimal for Lithium batteries. Let me know what you think. Thanks


   
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 Mike Sokol
(@Mike Sokol)
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Joined: 1 year ago
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What kind of RV do you have? If it a Class A or C motorhome with the engine in the RV, or is it a tow-behind or 5th wheel with a separate tow vehicle?


   
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 Joe
(@Joe)
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Topic starter  

Hi Mike, I have a tow behind TT that I'm towing with a GMC 2500HD. It had a towing package that includes two batteries along with an HD alternator.


   
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 Mike Sokol
(@Mike Sokol)
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According to CarGenerator, your vehicle alternator should be able to power a 2,000-watt inverter. Read more at CarGenerator.com


   
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 Joe
(@Joe)
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Topic starter  

Thanks Mike but the real question is what is the best way to charge my Lithium battery while I'm driving? Do I need a specific Lithium inverter? Right now I use a

Victron Energy Blue Smart IP65 12-Volt 10 amp Battery Charger

After I get to where I'm going and can plug in. This works okay as long as I can plug in but sometimes I don't have that option. 

This post was modified 1 year ago by Mike Sokol

   
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(@mike)
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You’ll want something like a RedArc BCDC 1225D DC to DC charger that will boost your alternator voltage to full charge your Lithium battery while limiting the charging current to protect the alternator. You’ll also need to run a heavy wire and Anderson connector between your truck and trailer to handle the charging current. Note that even a 25-amp charger will fully recharge a 100 amp-hr battery in about 4 hours of driving. 

This post was modified 1 year ago by Mike Sokol

   
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 Joe
(@Joe)
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Joined: 1 year ago
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Topic starter  

Thanks, I'll look into it. I must say it can get a bit expensive to go the Lithium route. If I had to do it over again I'm not sure if I would. This may be a good subject for an article. I'm sure a lot of people would be interested in the overall cost vs benefits on switching over to Lithium. It's not as simple as it seems.


   
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(@mike)
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Yes, it's not as cheap as one and done... There's a lot of other systems to be considered when upgrading to Lithium batteries. 

This post was modified 1 year ago by Mike Sokol

   
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 Scott
(@Scott)
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Joined: 1 year ago
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Mike, would not having the direct charge from tow vehicle to trailer for lithium batteries(2) be a major problem? I was thinking of placing a breaker in the line to "disconnect" the charging so as to not install a DC to Dc unit in the tow vehicle. I will be able to use the solar / portable generator to top those batteries off. Is this something you has seen previously?


   
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(@mike)
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Joined: 5 years ago
Posts: 121
 

The problem with your plan is that the Lithium battery will try to draw excessive current that your alternator probably can’t supply. The circuit breaker can’t reduce the current, it can only trip on overload. So I’ll bet it will be tripping most of the time. 


   
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 Irv
(@Irv)
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@mike   Anderson connector --This typo will confuse those who aren't familiar with them.  Your post  of

11/28 @ 6:33 pm


   
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(@mike)
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Joined: 5 years ago
Posts: 121
 

Thanks…. One of my pro-sound colleagues is Craig Anderton, so my auto correct tends to swap in a T instead of an S… 🤣🤣🤣


   
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