T4 Leisure Battery LiFePO4 Conversion

[gothmog827]

Hello, I have seen that prices and options for LiFePO4 have come a long way this year.

I am looking to make the conversion to LiFePO4 from current AGM batteries.

I have a T4 California 1992, with the separation relay in the compartment by the left rear wheel.

Based on the information I have found in my research and this post, I will be needing to switch the separation relay with a DC-DC charger (charging booster).
I still have installed the original charger for EHU, which, as I am understanding, will not need to be changed?

So it is as simple as this?

We already have a solar panel installed with a Victron MPPT charger that has the option for a LiFePO4 profile.

Here are the options I have found on the market, so I wanted to confirm if these products would be recommended:

Lithium Battery:
We have the option to get 1x150 for 350 euros, or 2x100 for 430 euros.
https://es.eco-worthy.com/collectio...bateria-litio-lifepo4-12v-150ah-con-bluetooth
Dc-Dc charger:
1) https://eu.renogy.com/12v-40a-dc-to-…214%22%7D%5D%7D
2) https://es.eco-worthy.com/products/40a-d…=42332239429838

The advantage of the 2nd one is solar can also be attached, but as I said, we already have the solar installed.

This means the conversion (including the battery) can be made for a total of 450 euros (for 150A) or 530 for (200A).

Between options of 20A and 40A, which would you pick?
Are these above options suitable for the installation?

 

[SpuffingtonMe]

I'm no expert, but I've had a few installs done recently.

From what I'm aware, although your mains charger may work in the short-term, if is old and designed for lead acid/gel/agm batteries, the chances are that it will shorten the life of your LifePo4 batteries and you would be better off changing the mains charger to one which can also accept LifePo4 charging profiles.

As you say, DC-DC and MPPT controllers will give you that choice.

Personally, I would go for whatever is the largest capacity charging you can with the DC-DC charger. I've had 50amps on my last two vans. Given the capacity of batteries you're looking at, they will cope with a decent charge over a few hours of driving.