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Old 06-10-2021, 04:51 PM   #1
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Lifepo4 battery install on 2005 Fleetwood Expedition 38N

can you replace wet cell batteries with lifepo4 batteries on a 2005 fleetwood expedition without a dc to dc charger to protect alternator?
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Old 06-10-2021, 05:05 PM   #2
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DependsÖÖ

How many batteries?

What is the gauge wire running from alternator to charge solenoid?

How far down will you discharge the lithium batteries before driving?

If you just go park to park (not boondocking) the batteries will not need much current to top them off and will not overtax the alternator.

You could also just start your generator while driving and charge them that way.
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Old 06-10-2021, 08:01 PM   #3
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For as much as you are spending on lifepo4 batteries you should put the dc to dc charger in. $170 for a 40amp renogy. Your converter has to be able to charge the batteries too. So make sure you can change charge settings on it too.
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Old 06-12-2021, 04:25 PM   #4
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I have the Freedom 458 Xantrex inverter and my understanding is you can use the AGM setting to charge lifepo4 batteries. I was just wondering if anyone has made the conversion on a 2005 Fleetwood Expedition 38N and what it entails.
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Old 06-16-2021, 06:59 AM   #5
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Quote:
Originally Posted by mcflop View Post
I have the Freedom 458 Xantrex inverter and my understanding is you can use the AGM setting to charge lifepo4 batteries. I was just wondering if anyone has made the conversion on a 2005 Fleetwood Expedition 38N and what it entails.
AGM setting will charge lifepo4 but the 2 batteries do take a charge differently. I would get a lifepo4 chargers for lifepo4 my fave is from Victron Energy with bluetooth. Victron also makes a smart shunt that is bluethooth. With both you can tell exactly the state of your batteries right on your phone.
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Old 06-17-2021, 09:14 AM   #6
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I have looked at Renogy dc to dc chargers that will protect the alternator. Does this perform the same function as what you are talking about.
Thanks
John
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Old 06-22-2021, 04:29 PM   #7
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Li-BIM 225

I used a Li-BIM in my '00 American Tradition. I have a pdf write-up of the project with some images and diagrams but it seems it is too big to post here. The images may not apply to you anyway so below is the summary I have completed explaining why it was needed and it's benefits. I am sorry if it didn't copy clean.

Integration of a Li-BIM 225 into an Intellitec BBC Model 00-00578.

The Li-BIM 225 is a battery isolation manager to monitor and maintain a connection, as necessary, between chassis battery banks and coach battery banks. It is advised for Lithium coach battery banks over 300AH.
1.) Boondocking - The higher voltage curve of the LiFePo4 would result in the coach bank being above the >13.3v BCC requirement and keep the banks combined virtually all the time. Not an ideal use of coach battery capacity if off grid. The Li-BIM keeps the banks separate unless the chassis is <12.5 and the coach >13.5. Then it connects to charge for an hour and disconnects and repeat as necessary.
2.) Shore power - Again this would result in the banks combined full time by the BCC. This would lead to an improper charging profile (higher voltage than spec) and potential damage to the chassis bank. Resolved by the Li-BIM the same way as #1 above.
3.) Driving - BCC would combine banks for charging which is okay on the surface. However, if the coach bank is sizable (400 AH+) and is significantly depleted, the ability for Lithium to accept massive current with little resistance would cause the alternator to be overworked and could result in the alternator overheating (and possibly worse, read alternator fire). The Li-BIM would cycle the bank connection to 15 min connected/charging to 20 min disconnected and would repeat so long as coach bank was <13.3 (otherwise keep disconnected). This would have the added benefit of lightening the load on the alternator.
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Old 06-25-2021, 07:00 AM   #8
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I've been considering replacing 2 of my house batteries with Lifepo4 as well. Still want to keep the lead/acid as a starter. I hadn't considered the alternator over working. Thanks for all of the updates!
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