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12vdc charger for 4s lifepo4 portable battery
#1
I'm looking for a 12vdc input charger that runs off the cigarette plug in a vehicle to charge a 37ah 4s lifepo4 portable battery. I'm also planning solar but I'd like to be able to run it off the engine when mobile. I've been searching around and so far have only come across lower power options (1.5 amp charge rate). I'd like something in the 5-10amp range so that I can charge relatively quickly.

This is a miscellaneous portable pack that will power QRP ham radios and cell phones. Nothing crazy just looking for diverse ways to keep it charged! Thanks.
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#2
Most RC smart chargers are DC-powered, just pick one of your choice. I'd recommend an iCharger 106B+ for this purpose. Or rather the new iCharger X6, I always forget about that one...
LEDSchlucker likes this post
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#3
Can those chargers be plug and play? I'd like to just plug in the cigarette port and then into my box.
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#4
No.

If you want a plug and play solution then I'd suggest buying a Victron PPP-40 battery. This one offers built-in, plug and play solutions to be charged from all kinds of sources.
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#5
If a charger can run from a range of like 6V - 16V (as there a lot of them that can have such a range, and even higher), then they will run on DC voltage from your vehicle. You just need to use the proper connector to hook it up.
I personally wouldn't use the cig lighter port for charging close to 10A. or even really higher than 5A. Unless the port is specifically called a "Aux Port" or "Accessory Port". Otherwise, the wires are usually fairly small and you'll get voltage drop on the wires under high amp draw.

If you don't have an Aux Port, then install another port that "can" handle those higher amps and use heavier gauge wire.

I've seen fuses for the "cig"port being only 5A.
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#6
The main reason I want to charge off an aux port is for long trips in the Type 3 Wildland fire engine. Those are wired for like 20-amp ports! The problem is that when we stop or anytime the engine is off the entire battery system and aux power gets shut off. So being able to charge a large battery at a faster rate and then use that smaller battery to run electronics and charge accessories would be handy. Also being able to run QRP ham radios for a few hours would be nice! I bought some of those lifepo4 cells from battery hookup to make a 4s10p with 3700mah 26650 cells. Should net me around 475wh.

Can I just use a buck/boost and bulk charge it to close to the top end voltage? I was thinking about adding a victron mppt controller for remtoe operation. Can I just wire in the dc from the vehicle to the mppt charger? What would happen if I did that?
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#7
20A! Nice. Shouldn't have any issue with those then Tongue

That's a good idea to quick charge a pack, then run smaller stuff off that pack. Should work.

Or you could just sneak in a and turn the ignition key to On when ya wanna charge your cell Tongue
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#8
And then offer your generous assistance to start the engine with your battery when the starter battery is completely flat! Big Grin
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#9
(02-07-2019, 04:44 AM)Korishan Wrote: 20A!  Nice.   Shouldn't have any issue with those then  Tongue

That's a good idea to quick charge a pack, then run smaller stuff off that pack. Should work.

Or you could just sneak in a and turn the ignition key to On when ya wanna charge your cell  Tongue

HAHA! Last time we were out we had to replace the batteries! Too much time on and totally killed them!! Good thing it only has 3 950CCA starting batteries.

(02-07-2019, 12:57 PM)DarkRaven Wrote: And then offer your generous assistance to start the engine with your battery when the starter battery is completely flat! Big Grin

It would probably crank it over a couple times! That would be quite the load!
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#10
Ok so looking at the hobby chargers I think that is what I am going to go with.

Here is the imax b6 https://hobbyking.com/en_us/turnigy-reak...arger.html
I like that one but it is only 50 watts of charge

I also found this one: https://hobbyking.com/en_us/turnigy-reak...arger.html
That has a higher charge current. Looks like I should be able to charge at 10 amps. This is going into a 4s10p lifepo4 26650 pack with 3.7ah cells. 1 amp charge per cell is conservative for the cell life but maximize my charge time. Does turnigy make a decent charger?
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