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02-24-2021, 12:54 PM
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#1
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1 Rivet Member
2019 25' International
Lincoln
, Nebraska
Join Date: Dec 2018
Posts: 8
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Lithium batteries
Hello all, I've been a member of this forum for quite a while, but I tried to private message CMHM thanking him for his information on lithium batteries and asking a couple questions. The forum says I can't private message until I'm a trusted member of the forum. It said to introduce myself, so here goes.
We have a 2019 International Signature 25FB. I'm wanting to upgrade to lithium batteries. We do not have solar. CMHM had some great information.
My questions are: Should heavier cables be installed between the new converter and the batteries? Someone mentioned protecting the alternator in the tow vehicle. Can someone explain that to me?
Thank you very much.
Gordon Opp Lincoln, NE 402-617-1129. gordon.opp@woodsbros.com
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02-24-2021, 01:25 PM
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#2
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Rivet Master
2015 20' Flying Cloud
Kingsport
, Tennessee
Join Date: Aug 2015
Posts: 1,290
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__________________
-Leslie
WBCCI #1051
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02-24-2021, 01:51 PM
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#3
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Site Team
2009 25' FB International
2018 27' Globetrotter
Tavares
, Florida
Join Date: Mar 2014
Posts: 3,722
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Hi Gordon,
Here is a video from the series, Ask an Airstreamer. I found it informative and you might as well.
https://www.airstream.com/ask-an-air...power-systems/
BTW I visited a supplier we had in Lincoln often in my working days. Nice city (except in winter then not as nice)!
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02-24-2021, 11:16 PM
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#4
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Site Team
2017 30' International
Broomfield
, Colorado
Join Date: Apr 2009
Posts: 3,555
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Lithium batteries
No you do not need to change cables if all you are doing is dropping in new batteries and a new converter.
Regarding your tow vehicle, you will need to simply pull the 30A fuse for the trailer 7-way plug 12v constant charge line. This fuse is located under your hood in the engine bay or in your glovebox or what have you. Check your manual.
Why? Lithium’s have higher voltage than the lead acid battery in your tow vehicle. You will actually reverse current and drain your lithium’s if you leave them connected to the tow vehicle without the engine running. Plus your alternator does not put out the correct voltage to charge lithium when it is running. There is a list of other issues but those are the main ones.
That is the simplest and most economical approach (pull the fuse). If you want to charge your batteries from the tow vehicle then you need to add a DC-DC converter to the system.
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02-25-2021, 05:06 AM
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#6
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2 Rivet Member
2019 30' Flying Cloud
Trophy Club
, Texas
Join Date: Sep 2019
Posts: 84
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Following
__________________
“Top”
2019 Flying Cloud 30 RBT Flying Warrior
2021 2500HD Z71 High Country 6.6l Duramax Warhorse
Hensley Arrow
“Tomorrow is not promised”
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02-25-2021, 09:20 AM
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#7
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4 Rivet Member
2018 30' Flying Cloud
Anchorage
, Alaska
Join Date: Sep 2018
Posts: 442
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Quote:
Originally Posted by wulfraat
No you do not need to change cables if all you are doing is dropping in new batteries and a new converter.
Regarding your tow vehicle, you will need to simply pull the 30A fuse for the trailer 7-way plug 12v constant charge line. This fuse is located under your hood in the engine bay or in your glovebox or what have you. Check your manual.
Why? Lithium’s have higher voltage than the lead acid battery in your tow vehicle. You will actually reverse current and drain your lithium’s if you leave them connected to the tow vehicle without the engine running. Plus your alternator does not put out the correct voltage to charge lithium when it is running. There is a list of other issues but those are the main ones.
That is the simplest and most economical approach (pull the fuse). If you want to charge your batteries from the tow vehicle then you need to add a DC-DC converter to the system.
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There is a jumper in the Airstream’s DC panel that ties in the charge line from the vehicle. In mine it goes to CB3. Removing that jumper is a better idea than removing the fuse in your TV, IMO. That way your trailer will be fine with any TV and your TV will still be fine for any trailer.
If the OP doesn’t have solar though, it’d probably be a good idea to just add the DC/DC converter so they can charge while towing.
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02-25-2021, 12:14 PM
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#8
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,653
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I just watched a LoLoHo video where they upgraded the alternator in their Tow vehicle after adding Lithium batteries and solar.
Changing from lead acid to Lithium batteries is more of a process than a battery swap.
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02-25-2021, 09:00 PM
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#9
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4 Rivet Member
2021 27' Globetrotter
Malibu
, California
Join Date: Dec 2020
Posts: 400
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Hi Gordon,
Sorry you couldn't direct message me, but I am as new to this as you are. The PDF I attached to the other post is basically what is given to Airstream dealerships for the upgrade.
The part with the tow vehicle is new to me, and seems very important. Could anyone explain what happens if the fuse is not taken out?
Thanks
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02-25-2021, 09:07 PM
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#10
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Site Team
2017 30' International
Broomfield
, Colorado
Join Date: Apr 2009
Posts: 3,555
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Quote:
Originally Posted by CMHM;
The part with the tow vehicle is new to me, and seems very important. Could anyone explain what happens if the fuse is not taken out?
Thanks
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See post #4 above
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