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Topic: Another lithium battery question (Read 633 times) previous topic - next topic

Another lithium battery question

I'm thinking of 2 300 AH LITHIUM batteries with a200 Ah BMS. The question is all the lithium battery folks say not to use them for starting, as the load is to great. With that said, we all know know that there are times that the boost sw is necessary to
Make good things happen. Has anyone had any issues doing that? Just asking questions before dumping a bunch of $$&, and the having oh by the way problems. Thanks
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: Another lithium battery question

Reply #1 –
Not with the 3 200 ah ones I have.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Another lithium battery question

Reply #2 –
Just trying to cover all my bases, don't need any O S$&@T moments.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: Another lithium battery question

Reply #3 –
Look at the max current limits of the batteries you are looking at.  I had considered lithium's when I did my house battery replacement a few months ago, but stuck with AGM's.  The Battle Born 8D lithium's are rated for 300A continuous, 500A for 30 sec and 500A+ for 1/2 second.  With two, that would give you an additional 1000A for cranking when needed.
 
270Ah 12V LiFePO4 Deep Cycle 8D Battery | Battle Born Batteries
Keith
2003 U320 38' #6197

Re: Another lithium battery question

Reply #4 –
Quote from: WS6_Keith –
The Battle Born 8D lithium's are rated for 300A continuous, 500A for 30 sec and 500A+ for 1/2 second.  With two, that would give you an additional 1000A for cranking when needed.
 
270Ah 12V LiFePO4 Deep Cycle 8D Battery | Battle Born Batteries

I have not timed how long my starter turns before engine starts, but I would think it would be more than 1/2 second
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Another lithium battery question

Reply #5 –
My understanding from the manufacturer I went with is that they should not be used for starting.  I went ahead with the installation and took a three month trip across the country.  Thank goodness I never needed the boost.  I will use it in an emergency.

I just put the start batteries on a trickle charger when we parked for over a week at any one spot. 

When I bought my coach, they were using the boost (Gel Batteries) to start.  I just cleaned and tightened connections to the battery and starter until it started more easily.

I am apprehensive of using the boost with my set-up.  I have not needed to as of yet.

-FT
2001 U270- 34'
with Aqua-hot
Travel Safely
Have Fun!!

Re: Another lithium battery question

Reply #6 –
Been using boost to start the ISM almost exclusively for 4 years with my 6 100 ah Battle Born house cells. 

Electricity takes the path of least resistance so with the start batteries right next to the starter, and the house batteries 30' away, the lithiums are the path of most resistance and the start batteries pull most of the current.  i.e. in boost mode, the BB's are giving a voltage boost to the start batteries more than a current boost.  Prove me wrong.
2001 4010 U320 build #5865 "Bluto-d-Bus" since 09/18
2006 Honda Element ESP Toad
Full timing since 2016 in Western MT
Copilot: Sitka
1975 GMC 260 Avion: sold

Re: Another lithium battery question

Reply #7 –
Quote from: turbojack –
I have not timed how long my starter turns before engine starts, but I would think it would be more than 1/2 second

500A for 30 seconds.  2 batteries = 1000A for 30 seconds...plus your chassis batteries.  Still not enough? 
Keith
2003 U320 38' #6197

Re: Another lithium battery question

Reply #8 –
I'm running 4s 6p 3.1v 120 ah lifepo4  for a total of 720 ah. That is 24 cells in the bank. I can put 2 more banks in the space. Also I use a 200amp bms. I use the boost switch on the first start of the day. After that the red tops work fine. No problem with the lifepo4 so far. As stated it is about the surge 14.6 v . My ISM turns real fast with the boost. Probably going to change the starter to a gear reduction in the future.
99 U320 40
97 Jeep wrangler toad
Now full time 8 months
Starting a new brick and wood home
Chattanooga, Tn

Re: Another lithium battery question

Reply #9 –
Quote from: Woody & Sitka –
Been using boost to start the ISM almost exclusively for 4 years with my 6 100 ah Battle Born house cells. 

Electricity takes the path of least resistance so with the start batteries right next to the starter, and the house batteries 30' away, the lithiums are the path of most resistance and the start batteries pull most of the current.  i.e. in boost mode, the BB's are giving a voltage boost to the start batteries more than a current boost.  Prove me wrong.
I'm curious why you think your healthy chassis batteries need help from the house bank. Most class 8 tractors with engines bigger than yours only have chassis batteries.
2008 Nimbus 342
Build# 6464
ISM 500
Allison 4000 w/retarder
2021 Jeep Grand Cherokee

Re: Another lithium battery question

Reply #10 –
Gel cells have a lot of internal resistance compared to flooded or lithium cells.  If you haven't spun an ISM with stock starter, boosted by the house bank, particularly 13.5V lithium house bank, you don't know what you're missing. 

Quote from: Res777 –
I'm curious why you think your healthy chassis batteries need help from the house bank. Most class 8 tractors with engines bigger than yours only have chassis batteries.
2001 4010 U320 build #5865 "Bluto-d-Bus" since 09/18
2006 Honda Element ESP Toad
Full timing since 2016 in Western MT
Copilot: Sitka
1975 GMC 260 Avion: sold
 

Re: Another lithium battery question

Reply #11 –
With 720 ah of lithium there's no spinning ( if boosted )  I can barely let go of the key fast enough.    But then I do have over 2400 cold crank amps for starting. 
    Rarely need to boost....
Robert and Susan
 1995 36' 280 WTBI 8.3 3060r
 1200 watts on the roof, 720 Ah of lithium's
 Build # 4637. Motorcade # 17599
        FMCA  # 451505
        18  Wrangler JLUR