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Old 08-23-2019, 12:26 AM   #1
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Swap for lithium?????

I have a 2001 Damon Intruder. It is currently using two 6 volt golf cart batteries. I think I know the answer to the following, but thought Id better check it out to be sure...

Can one replace the lead acid batteries with lithium batteries without changing the charging system ( a simple swap out)?

I doubt this is possible, but thought Id check out just to be sure.
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Old 08-23-2019, 01:00 AM   #2
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Yes, there are drop-in replacements but sit down before you look at the price.
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Old 08-23-2019, 02:29 PM   #3
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But would the existing changer system ( converter) work with lithium? I have read some company descriptions which make it sound “iffy”.
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Old 08-23-2019, 02:58 PM   #4
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Originally Posted by Rcyoung View Post
But would the existing changer system ( converter) work with lithium? I have read some company descriptions which make it sound iffy.
If they are "drop in" replacements - yes. That means they have an integral Battery Control Module which handles the charging/discharging intricacies.

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You do not need a special charger to charge your LFP deep cycle battery. As I mentioned above the battery prefers to bulk charge at 14.4 volts and float at 13.6 volts. Most standard chargers can handle these settings. There are some made for lithium chargers available on our store page and they will charge faster than a regular charger in most cases.
https://battlebornbatteries.com/buy-...po4-batteries/
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Old 08-30-2019, 07:46 PM   #5
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What kind of inverter/charger do you have?
The reason I ask is that your inverter/charger may be programmable, allowing you to optimize the settings to be more comparable with the LiFePo batteries.
For example, if you have an inverter/controller with a control panel in the RV, you should be able to change the Battery Type from "Flooded" to "AGM" which will get you closer to the optimal charging profile. If you also have the choice of "Custom" , then that should bring up sub menus for all of the specific parameters, which the battery manufacturer can/will provide.
I have a Magnum inverter/charger but had to buy one of their control panels to access the Custom settings, because they weren't available through my factory Firefly control panel in our 2018 Palazzo.
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Old 08-30-2019, 08:38 PM   #6
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I would just go with AGM and call it a day
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Old 08-30-2019, 09:10 PM   #7
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Id just go with new flooded golf cart batteries. Mine last about 3 years of semi neglectful use. Can go through 3 sets for the price of AGM and I cant even imagine how many before matching the cost of lithium! Plus the flooded ones give you plenty of notice that they are approaching their demise. My experience with AGM is that they work great until one day they dont work at all. But, whatever works best for you is what you should do.
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Old 08-30-2019, 10:03 PM   #8
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Lithium batteries do offer another advantage: a huge savings of weight and space!
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Old 08-31-2019, 02:25 PM   #9
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Ive been thinking of going with lithium to replace my existing Interstate 6 volt batteries. The existing set up has a capacity of 225 amp hours, about half of which is usable. 200 amp hours of lithium would give me more usable capacity as you can discharge down to about 10%

I can reprogram my solar charger (Bogart SC-2030) to work with lithium. Not sure about my Progressive Dynamics converter. Need to do more research. Main issue is winter time. We store our coach outdoors and I think id have to pull the lithium batteries and drop in a cheap lead acid battery that would be kept charged with the solar panels such as I do today. I visit the coach every few weeks and run the engine and generator.

In the spring Id put in the Lithium batteries back in and reprogram the solar controller. Now all I have to do is budget the 2 grand for the batteries.
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Old 08-31-2019, 03:23 PM   #10
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Please let us know what you find out.
Lithium batteries are the "new kid on the block", and there seems to be a lot to learn about them.
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Old 08-31-2019, 03:37 PM   #11
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Running true deep cycle batteries down beyond 50% doesnt add that much cost, even though cycle life is reduced.

Weight is the main drawback to lead-based batteries. But lithium has more temperature issues, so a good case can be made for either choice depending on ones planned battery use.

Trojan chart attached for reference.
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Old 09-02-2019, 01:59 AM   #12
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Originally Posted by Rcyoung View Post
But would the existing changer system ( converter) work with lithium? I have read some company descriptions which make it sound iffy.
Integrated BMS lithium is ok with two exceptions, chargers that have a desulfation function (needs to be shut off) and charging when they are below freezing. Smarter BMS's will block these one way or the other but generally disconnecting the battery to do so.

Now you can also try and charge them too fast thats normally only the case with combiner type rigs and only the more advanced BMS's with integration deal with this (meaning the BMS is talking to the charger, battery monitor etc).

I have to say that lithium and a big inverter was the best quality of living upgrade I did. AC all night dry camping without a gen set running keeps a wife happy.
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Old 09-02-2019, 03:18 AM   #13
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How much solar on top, and how many lithiums to use the AC? And the inverter?
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Old 09-03-2019, 01:07 PM   #14
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How much solar on top, and how many lithiums to use the AC? And the inverter?
Thanks
Joe
1200w on top 4x200ah 12v Victrons and a 3kva victron inverter. I'm running a mac 3 ps so it's 1200w on high thats 30-60ah an hour once it's down to temp. Would look at the dc 9000's thats only 50a at 12v just expensive to buy into. The solar needs about 8 peak hours to recharge the 800ah without anything running.

A sunny day while traveling can keep the AC going from PV alone, cloudy and I get 40a from the alternator that tends to be enough to a little under with the fridge on AC as well. Dry camping nice weather generally do not need the gen set while still using AC/microwave/toaster oven.
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Old 09-03-2019, 08:39 PM   #15
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Originally Posted by Silas View Post
1200w on top 4x200ah 12v Victrons and a 3kva victron inverter. I'm running a mac 3 ps so it's 1200w on high thats 30-60ah an hour once it's down to temp. Would look at the dc 9000's thats only 50a at 12v just expensive to buy into. The solar needs about 8 peak hours to recharge the 800ah without anything running.

A sunny day while traveling can keep the AC going from PV alone, cloudy and I get 40a from the alternator that tends to be enough to a little under with the fridge on AC as well. Dry camping nice weather generally do not need the gen set while still using AC/microwave/toaster oven.
1200w and 4x200 takes up a lot of space. What's your rig, if you don't mind me asking?
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Old 09-04-2019, 07:29 PM   #16
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1200w and 4x200 takes up a lot of space. What's your rig, if you don't mind me asking?
Not realy that is on my now old 2009 Springdale 303bh TT the batteries fit nicely under the sink along with the inverter and the rest, 12x 100w panels fill the roof. My battery vendor (Victron) actualy has a new version of my 200ah comming out they dropped nearly half the weight and a bit physically smaller. No need to vent or maintain so a few feet back in a cabinet is fine.

New rig is a 2015 35sb still working on where things will go I fly down to drive it back in a week. Expect that will add a second 3kva inverter and alternator while reusing the rest. Have all winter to deal with that.
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