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 > Are lithium batteries worth the cost?

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Avid Fox

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Posted: 04/20/21 06:46pm Link  |  Quote  |  Print  |  Notify Moderator

I can carry two group 29s in my AF1150.

Are they worth it?

jimh425

Western MT

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Posted: 04/20/21 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

It just depends on how far you want to draw your batteries down. Another option is to add batteries in the corner of your bed and connect them all together.

Should be a fun thread.


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Avid Fox

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Posted: 04/20/21 07:01pm Link  |  Quote  |  Print  |  Notify Moderator

jimh425 wrote:

It just depends on how far you want to draw your batteries down. Another option is to add batteries in the corner of your bed and connect them all together.

Should be a fun thread.


I have a sine wave inverter for electric blankets and coffee. I can get two nights out of the two batteries I have now. After that, it becomes iffy, and the fridge starts talking to me about low voltage...

Double that capacity would be awesome. LI batteries weight half as much as regular deep cycle also.

time2roll

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Posted: 04/20/21 07:14pm Link  |  Quote  |  Print  |  Notify Moderator

If you need the power I believe they are worth it. I plan to build my own and save some money.

Something like this: https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30231150.cfm


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Avid Fox

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Posted: 04/20/21 07:52pm Link  |  Quote  |  Print  |  Notify Moderator

I'm not sure I understand the charging setup.

My f350 has dual alternators that can deliver about 380 amps if needed. I already have giant charging cables back to the camper via a solenoid. Which work great BTW.

Do I need to limit the LI recharging to amp ratings and cable sizes, or just make sure the voltage is within range of 13.2 to 14.4? The Ford always delivers 14.4 to start, then backs off to 13.2 eventually when it senses they are fully charged. Will that work, or do I need something more fancy?

* This post was edited 04/20/21 08:05pm by Avid Fox *

time2roll

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Posted: 04/20/21 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

14.4 volts is fine for charging. Best to limit charging to 50% to 30% of capacity on a regular basis. So a 200 Ah battery should be charged at 100 amps or less. Not going to hurt to put it in and see what happens a few times. And of course check with what is recommended by the manufacturer.

theoldwizard1

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Posted: 04/20/21 10:42pm Link  |  Quote  |  Print  |  Notify Moderator

The big "win" on lithium batteries is that can be discarged down to near 0% SOC, repeatedly without damage. Lead acid should not be discharged below 50%, and for maximum life, not below 80%.

The second "win" is longevity. Any comparison between the two chemistries will take in to account that lithium batteries last 4 to 6 times (maybe more) longer.

Avid Fox wrote:

Do I need to limit the LI recharging to amp ratings and cable sizes, ... or do I need something more fancy?

Some lithium batteries have built in charge controllers. Bare cells (which are much cheaper) do not. For optimal battery charging from your vehicle, even with lead acid batteries, you should use a DC-DC charger.

* This post was last edited 04/21/21 08:24am by theoldwizard1 *   View edit history

StirCrazy

Kamloops, BC, Canada

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Posted: 04/21/21 06:08am Link  |  Quote  |  Print  |  Notify Moderator

Avid Fox wrote:

I'm not sure I understand the charging setup.

My f350 has dual alternators that can deliver about 380 amps if needed. I already have giant charging cables back to the camper via a solenoid. Which work great BTW.

Do I need to limit the LI recharging to amp ratings and cable sizes, or just make sure the voltage is within range of 13.2 to 14.4? The Ford always delivers 14.4 to start, then backs off to 13.2 eventually when it senses they are fully charged. Will that work, or do I need something more fancy?


I would ut in a DC to DC charger. seeing you have dual altanators you can go with a larger one like a 60amp if your cables will handle it, but thats the best wy to charge the LFP batteries. you would also need to make sure your converter in your camper has a "lithium" setting if not just change it out for a charger section that does.

I dont know about down there but for the AH up here lithium is about the same cost as deicent high quality deep cycle batteries now (for the same usable capacity)

Steve


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2016 Cougar 330RBK

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utah

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Posted: 04/21/21 06:52am Link  |  Quote  |  Print  |  Notify Moderator

jimh425 wrote:


Should be a fun thread.


[emoticon]


Kenny
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mbloof

Beaverton, OR

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Posted: 04/21/21 06:53am Link  |  Quote  |  Print  |  Notify Moderator

The last time the #27 battery in my camper needed replacing, I went with a Battleborn. Here's my thinking:

- Lifetime cycles, while quality FLA's were rated at 300-900 lifetime charge/discharge cycles, the Battleborn was rated at +3000 cycles

- Capacity, the FLA's only have a usable %50, the Battleborn is nearly %100 usable capacity.

Charging - given the three possible charge sources, my solar controller had a LI setting compatible with the Battleborn, truck-2-camper charging was never really used (or upgraded to be useful) and the onboard Progressive Dynamics converter/charger was replaced with a LI compatible model (~$250).

To conclude, while the Battleborn cost ~2-3x what a quality FLA would cost, I believe it will last longer, have more capacity and be truly "maintenance free".


- Mark0.

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