Battle BornLithium 100 AH

e9999

You want to do what...?
Moderator
 
 
Joined
Sep 21, 2003
Messages
16,757
Location
US
back of the envelope: Fridge draws 5A, works 1/3 of the time: 30/5*3=18 clock hours
 

e9999

You want to do what...?
Moderator
 
 
Joined
Sep 21, 2003
Messages
16,757
Location
US
Nernst and all is for the front, have a go ...
 
Joined
Jun 15, 2016
Messages
225
Location
Denver
@Prairie Swamp No experience yet, everything just came today. I have the MT45 combi. Just some fuzzy 'perfect-world' math, but if the fridge is drawing 2 amps/hr that should give me 15 hours. Hoping to add a small solar setup later on.
 
Joined
Aug 22, 2015
Messages
1,088
Location
Ohio
Ok thanks. My MT45 draws 2.4 amps when running. After that like Tony said it all depends. Ambient temperature, how often you open it, etc. In 70 degrees F mine runs about 33 percent duty cycle. So in 12 hours (overnight) that's say 15 amp-hours which is the max draw down on a 30 Ah battery. I think I'll go 50 Ah to be safe. Thanks.
 
Joined
Jun 15, 2016
Messages
225
Location
Denver
Yes I may very well be upgrading in amp hrs after this. We'll see! Another thought I had was to install a relay to switch to starting batteries after the lfe drops to a certain voltage. I really only need it as an overnight buffer.

-edit-
Also, I think lfes have a higher usable draw down percentage, maybe more like 80%. Still 12hrs at 2amps/hr. All hypothetical, happy to be the 30ah mt45 guinea pig.
 
Last edited:

e9999

You want to do what...?
Moderator
 
 
Joined
Sep 21, 2003
Messages
16,757
Location
US
keep in mind that some of those LiFeP batteries have built-in protection circuits and with mine at least the manufacturer strongly discourages having more than one battery connected to the load. Presumably because the protection circuits can't handle parallel connections. Don't know why. But the point is that you may not want to assume that you can just add a bunch of those in parallel later on if they don't have enough capacity to start with.
 
Joined
Oct 27, 2003
Messages
9,610
Location
North Cadillac
keep in mind that some of those LiFeP batteries have built-in protection circuits and with mine at least the manufacturer strongly discourages having more than one battery connected to the load. Presumably because the protection circuits can't handle parallel connections. Don't know why. But the point is that you may not want to assume that you can just add a bunch of those in parallel later on if they don't have enough capacity to start with.
I know in the sailboat world they do that all the time. 10-20 LiFeP batteries hooked together in parallel being used and charged via solar and wind generators.
 

AndrewHadji

GOLD Star
Joined
May 10, 2015
Messages
1,626
Location
NC
i picked up the battle born 12 v 100 ah and have it paired with a bcdc1225d redarc with lithium profile, so far so good, better than my 2 x 100 ah agms... i have yet to look back
 

RFB

97 FZJ80 LIFTED SC DUAL BATTERIES,37s
GOLD Star
Joined
Mar 7, 2017
Messages
3,129
Location
Nahant Ma.
i picked up the battle born 12 v 100 ah and have it paired with a bcdc1225d redarc with lithium profile, so far so good, better than my 2 x 100 ah agms... i have yet to look back
Ok so I went with the reLion 100AH lithium LT(low temp) it can still be charged in cold weather because it has heating element built in Ill also be using the BCDC1225D but I may keep both my AGMs up front with a blue sea ACR dealing with them. Not sure yet but I have everything to install either way .
 

RFB

97 FZJ80 LIFTED SC DUAL BATTERIES,37s
GOLD Star
Joined
Mar 7, 2017
Messages
3,129
Location
Nahant Ma.
i picked up the battle born 12 v 100 ah and have it paired with a bcdc1225d redarc with lithium profile, so far so good, better than my 2 x 100 ah agms... i have yet to look back
do you have a diagram of your wiring layout? or did you have it done.
 

AndrewHadji

GOLD Star
Joined
May 10, 2015
Messages
1,626
Location
NC
pretty much followed the instructions for the bcdc1225, ill see if i can find online. if it has a relay for the solar, its the older model, the newer model does not need a relay to connect solar.
 

RFB

97 FZJ80 LIFTED SC DUAL BATTERIES,37s
GOLD Star
Joined
Mar 7, 2017
Messages
3,129
Location
Nahant Ma.
its a newer model and no relay for solar.
 

RFB

97 FZJ80 LIFTED SC DUAL BATTERIES,37s
GOLD Star
Joined
Mar 7, 2017
Messages
3,129
Location
Nahant Ma.
Purchased a small 30ah LFE battery to run the fridge overnight. Bought a relay thermostat to disable charging below freezing. I hear some of the larger starter LFEs have heater elements in them... Not 100% sure on that though.

Im planning on charging it directly off the alternator with an isolation manager designed not to float the LFE. Should have that up and running in a week or two.

Also in my research I found this vid, thought it worth sharing:

good video but the technology from 14 to now is voodoo witchcraft leaps and bounds ahead
 
Joined
Jun 15, 2016
Messages
225
Location
Denver
Used my 30AH LFE over the last week out camping. Weather was on the cool side. Was stationary for more than 48 hours at one point. Ran the alternator at idle for a few minutes each day to be safe. No problems whatsoever keeping my Engel 45 going. Was convinced I'd need solar to make it work, but it seems to charge pretty quickly off the alternator. More use and hotter weather will tell if its a good long-term solution.
 
Joined
Oct 27, 2003
Messages
9,610
Location
North Cadillac
yea, toss a panel on there and you can sit for days. It really is a game changer for long camping trips. I know I have had my setup on the beach running with the fridge, stereo on, and a crock pot cooking a pork butt all day long.
 
Joined
Jun 15, 2016
Messages
225
Location
Denver
I think solar is on the short list for purchase. Here's a pic of my setup. Still some room for a solar controller.

- Ignition controlled fuse block and relay
- Coach/lfe fuse block
- Battery isolation manager for LFE batteries
- Adjustable thermostat to cut BIM charging below 0 celcius
- 30AH LFE (lower right corner)
- Crappy inverter

1985118


Oh, also I was just at Overland Expo and it was a little shocking to learn most vendors aren't familiar with LFE technology. I walked in with my wallet ready for a solar setup.
 
Joined
May 25, 2016
Messages
73
Location
Chapel Hill, North Carolina
I think solar is on the short list for purchase. Here's a pic of my setup. Still some room for a solar controller.

- Ignition controlled fuse block and relay
- Coach/lfe fuse block
- Battery isolation manager for LFE batteries
- Adjustable thermostat to cut BIM charging below 0 celcius
- 30AH LFE (lower right corner)
- Crappy inverter

View attachment 1985118

Oh, also I was just at Overland Expo and it was a little shocking to learn most vendors aren't familiar with LFE technology. I walked in with my wallet ready for a solar setup.
Thanks for the details - this is very similar to the direction that I want to go. See you have a Wits End rear quarter panel mount. Will the original panel cover fit over this set up? Also, which 30ah battery are you using? Thanks!
 
Top Bottom