lithium battery

[barnyard]

can I replace the lead acid battery in 2008 2720with a lithium battery without problems ? will the stock TM charger correctly charge Battery

[dspiveysr]

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1The stock charger most likely does not support lithium. I replaced the converter in my 2007 2070 with this one..
VEVOR WF-8955-AD-MBA Main Board Assembly, 55 Amp, Three-Stage RV Power Converter Replacement Unit, Compatible with Lithium Lead Acid Battery

[dspiveysr]

I replaced the stock converter in my 2007 2720 with the VEVOR model from Amazon and have been very satisfied. I installed 2 140AH Redodo batteries as well as a Redodo DC/DC converter, giving me the ability to use solar panels as well as proper charging from the tow vehicle.. I have opted to use portable panels rather that permanently installed ones.

Redodo 12V 40A DC to DC Charger with MPPT

VEVOR WF-8955-AD-MBA Main Board Assembly, 55 Amp, Three-Stage RV Power Converter Replacement Unit, Compatible with Lithium Lead Acid Battery

[Wavery]

Originally Posted by barnyard

can I replace the lead acid battery in 2008 2720with a lithium battery without problems ? will the stock TM charger correctly charge Battery

Check the "Owner's Manual" for your camper's converter. It may have an option to charge AGM batteries. The algorithm is nearly identical to lithium and should charge your battery just fine.

If it does not have the AGM option, you can just replace the converter's charging unit. I recommend this one:
https://www.etrailer.com/RV-Power-Co...YaAojaEALw_wcB

You don't have to install it inside the converter box. You can install it anywhere close to the battery that you can get 110V. It's just a battery charger, no more, no less.

[MBushaw]

Even an old power controller will charge lithium batteries to over 80%. This in combination with a plug in battery maintainer that does recognize lithium should keep your batteries in good condition. Let the solar and whatever shore power you can get to keep the batteries going, use the maintainer at home or on the road if you can.
If you boondock a lot then you should probably upgrade, otherwise just get the maintainer and you’ll be fine.

[rickst29]

Wavery's suggestion is good. Progressive Dynamics makes very good converters (designed AND built in USA), but the output voltage can't be adjusted by cellphone. When you set the battery type as "Lithium", the output voltage in new models is 14.4 volts. In older models the output voltage is 14.6 volts.

Both values are higher than you want to have within long-term storage of Lithium battery packs ('LFP' , Lithium Ferro Phosphate). But a decent battery pack either pre-assembled or built form 4 individual cells at home, should include a "Battery Maintenance System" (BMS) which will manage cell balancing and limit charging to a limit you CAN change, without opening the trailer - you just hold your cellphone near your battery compartment (outside the aluminum skin) and specify a lower 'maximum charging limit voltage'.

During trips, you can use allow up to 3.60 per cell (14.4 total). That maximum must never exceed 3.65 volts, but 3.60 is already more than 99.5% full. Actual use of Tthe battery, within that last one-half of one percent, can create issues you don''nt want t0 have. So stop at 3.60, with 'balance' start slightly lower. A good PD converter will continue to offer more charging current, but the BMS will refuse to let any charging current into the battery.