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Lithium Battery Install

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Engineerlt

Lithium Battery Install
« on: July 31, 2022, 10:26:10 am »
Hello All
I figured I would put this out there for those of you interested in installing lithium batteries. So I purchased 2ea SOK 206ah Bluetooth/Heated batteries. I chose these batteries for several reasons, I could get the most amp hours in the space I had, they are serviceable (you can actually open them up) , the cost per amp hour was very competitive and they have a good reputation. I had to reconfigure the battery box for the new batteries. I removed the box and did some fabrication.

 Then the wiring, I installed a battery disconnect switch for each battery. I figured it would help make troubleshooting easier by being able to isolate each battery. I put the batteries in parallel using the post method, which is using a bus bar and running a the same length 1/0 wire from each post and then to the bus bar. From the bus bar I ran a 3/0 wire to a copper bus bar that was 1/4in thick by 1in wide and 10in long. This was setup to accept the ANL fuse holders for Solar (40amp), HWH levelers (150amp),  generator (130amp), and  the inverter/power panel (300amp). I also installed a Renogy 40amp DC to DC charger. I chose this one as it is the simplest to operate and gives you the option to go from 40 amps to 20 amps and I figured this might be useful if you had a large electrical load on the alternator.

 So installing the DC to DC charger means you have to disconnect the normal way the alternator charged the house battery. This was done very simply by removing a couple wires from the solenoid located under the coolant overflow bottle. The biggest part of the installation was running the wires.

  I did have a "Oh Heck" moment. After charging the batteries, I discharged them down to the bottom of 10.5 Volts. I wanted to see if the rated capacity of the batteries matched actually capacity. The answer is yes actually 418 amps. The issue was charging the batteries back up, I have a WFCO 9855LIS converter which replaced the stock 55amp Parallax converter, which wasn't rated for lithium batteries. So a 55 amp converter for a 55 amp converter. Well PC's wiring was under sized for the converter, they ran 8 AWG. I guess they figured the converter would never put out rated capacity charging lead acid batteries. So what happened, lithium batteries are almost like a direct short and take as much amperage as the BMS will allow. So the converter went to maximum amperage and the wires from it got hot. So I shut it down and changed out the wire to the maximum the converter lugs would carry and that was 2 AWG. No issues now...

Here are a couple pictures, if you have any questions just message me and I will be happy to help if I can.

Very Respectfully
Lance
« Last Edit: July 31, 2022, 10:29:50 am by Engineerlt »

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fandj

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Re: Lithium Battery Install
« Reply #1 on: August 01, 2022, 06:30:12 pm »
Lance,
As expected from seeing some of your other PC upgrade projects,  the Lithium battery installation appears very neat and well thought out.  You should have ample electrical storage for most anything you choose to power.


I hope you provide a follow up after the batteries, solar panels, etc. are installed and you have a few off grid camping experiences to share.


Fred

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jim.godfrey

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Re: Lithium Battery Install
« Reply #2 on: August 01, 2022, 07:44:31 pm »
Lance, I think the back plane for your isolation switches would have looked better in plywood. roflol

Nice work as per usual!

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Ron Dittmer

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Re: Lithium Battery Install
« Reply #3 on: August 01, 2022, 10:49:53 pm »
Ron (& Irene) Dittmer

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parkgt

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Re: Lithium Battery Install
« Reply #4 on: August 02, 2022, 07:35:34 am »
Lance knows is stuff and is willing to share his knowledge.  I am following his lead on some major upgrades.  His help has been crucial to me having the courage and guidance to undertake this project(s).  He has had to spoon feed me on much of the electrical considerations and described how to to many steps when I was uncertain.

I have a ways to go, but with his help I think I will make it!

Here is a list of what I am doing and the things he has helped me plan to get done.

Second A/C in back. Both will be the Recpro 3400 Houghtons.
Flexarmor roof coating, with unitstruts for 400w of solar panel.
Charge controller
DC to DC charger
Auto Gen start
Victron Inverter
2 - 206ah SOK batteries
Upgraded wiring as required

A major hurdle is having a enlarged battery box.  Below is the new one I built.


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bobkbusch

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Re: Lithium Battery Install
« Reply #5 on: August 30, 2022, 02:18:23 pm »
Looks like a well thought out and very capable setup Lance!  I'm still considering putting a DC-DC charger in my 2022 2552, but I don't quite understand the wiring.

As it is installed from the factory, it goes through the solenoid and breaker under the coolant bottle in the engine compartment, to...I don't know where...then eventually to the coach batteries.  I have a Victron Smart Shunt in my setup and never saw more than 20 amps coming from the alternator.  However, now I don't seem to be getting any charge from the alternator and don't know where to troubleshoot.  (Battery charging to the chassis/engine battery is working well.)

Even a rough sketch wiring diagram would be helpful. 
« Last Edit: August 30, 2022, 05:46:39 pm by bobkbusch »

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CalCruiser

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Re: Lithium Battery Install
« Reply #6 on: August 30, 2022, 05:13:49 pm »

No alternator current to the house batteries due to a faulty  40A self-resetting breaker under the coolant reservoir is a common failure mode, not necessarily due to excessive amps. I carry a spare just in case. Refer to the engine  compartment part of the schematic linked here:
https://forum.phoenixusarv.com/index.php?topic=4781.0
Goin' where the wind goes...

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bobkbusch

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Re: Lithium Battery Install
« Reply #7 on: August 30, 2022, 05:58:33 pm »

No alternator current to the house batteries due to a faulty  40A self-resetting breaker under the coolant reservoir is a common failure mode, not necessarily due to excessive amps. I carry a spare just in case. Refer to the engine  compartment part of the schematic linked here:
https://forum.phoenixusarv.com/index.php?topic=4781.0

Excellent info, and the referenced schematic by Keelhauler is very helpful - thank you!

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parkgt

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Re: Lithium Battery Install
« Reply #8 on: September 12, 2022, 10:55:05 pm »
Major electrical upgrade completed!

Thanks to Lance Brant's constant, invaluable and cheerfully given guidance I finished up a two month long project.

Flex Armour on roof along with unistruts for 4 solar panels.

Installed two 206h SOK lithium batteries in a newly fabricated battery box.  Upgraded wiring all around.

Second A/C unit on a separate plug 13500 BTU RecPro 3400.  Very quiet and more efficient.
Replace primary A/C with another 3400 which can run off battery bank/inverter for over three hours.

Victron Mulitplus 2kVA 120 inverter, which includes a 50 amp charger.  New remote panel.
Victrorn 30amp DC to DC charger with on off switch.
Victron  30 amp solar charge controller for the 4 100 watt Renogy panels.
Victron BMV-712 Smart battery monitor, with relay connected to auto start gen at low SOC if needed.

Onan AGS+ auto gen start with battery sense and temp starting.

It involved countless hours and a fair amount of money.  The end result is a more flexible, capable and robust system than our 2018 2552 had. It should more than cover all our use cases.  Seems like it is ready for anything we could imagine needing to do.

Next up getting a 2014 Honda CR-V setup as a toad.
« Last Edit: September 13, 2022, 08:04:33 pm by parkgt »

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Woodchuck

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Re: Lithium Battery Install
« Reply #9 on: September 13, 2022, 07:53:18 pm »
PARKGT, Just wanted to let you know about a 2014 CRV  EXL loaded listed on Tiffin Classifieds. The car is ready to tow with low miles. This website is open to the public, google Tiffin Classifieds. Glad to see that Lance helped you through some tough stuff. This fourm will miss his knowledge & respectful manner. A friend & Great Guy! I tried to PM you but you were off line.  :) Chuck  P&S: just looked & there's two for sale now.
« Last Edit: September 13, 2022, 08:14:13 pm by Woodchuck »
Chuck & Sheila

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parkgt

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Re: Lithium Battery Install
« Reply #10 on: September 13, 2022, 08:02:33 pm »
Thanks for the reply, might have gone that way, but too late now.  I picked up a 2014 with only 44k one owner miles.  It is in as new condition and doesn't have any tow miles on; those don't show on the odometer.

Just like doing my own electrical upgrade, setting it up myself will mean I will understand it all and know how to work on any of it.  Sometimes that can be beneficial enough to justify the effort.

Yes, it is shame Lance felt it necessary to leave this forum.
« Last Edit: September 13, 2022, 08:05:34 pm by parkgt »

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2 Frazzled

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Re: Lithium Battery Install
« Reply #11 on: September 14, 2022, 04:45:12 am »
I obviously missed something. What happened to Lance? Is there a post about his leaving?
John, Holly, and sometimes Chloe.
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parkgt

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Re: Lithium Battery Install
« Reply #12 on: September 14, 2022, 06:42:44 am »
I believe Lance is too nice a guy to publicly air the negative interactions he had with some other know-it-all members.  He is on the FB group from time to time.

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Woodchuck

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Re: Lithium Battery Install
« Reply #13 on: September 14, 2022, 12:42:55 pm »
Well said!
Chuck & Sheila

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Re: Lithium Battery Install
« Reply #14 on: September 15, 2022, 03:22:55 am »
That is a shame. It's a wealth of information lost to other members and, I believe, a loss to him too. It's nice to belong to a pack. I've met and really like Lance (wife and doggo too). I hope we meet again somewhere down the road.
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