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01tundra

Middle, TN

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Posted: 09/22/20 09:03am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

I think the issue is over voltage to the LI battery bank, not protection of the alternator.


LI batteries have been known to burn up some alternators due to the high charging demand, they've also been known to draw down tow vehicle batteries due to the higher resting voltage of LiFePO4 vs LA, if left hooked up with the engine off with a constant hot charge wire.

There is no overvoltage worries due to the voltage drop on inadequate factory wiring for charging purposes. If you upgraded you wiring such that you could get higher than 14.6V at the batteries then the BMS would kick in on high voltage.

For MY application the DC charger is there to actually provide enough amps to charge the batteries while running and isolation from the TV when the engine is off.

DC chargers have many benefits and one is absolutely protecting the alternator -

https://www.victronenergy.com/blog/2019/......../07/careful-alternator-charging-lithium/

* This post was edited 09/22/20 10:37am by 01tundra *


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Posted: 09/23/20 09:31am Link  |  Quote  |  Print  |  Notify Moderator

I think it is the other way around, an LiFePO4 battery will actually (slightly) charge the the starting battery, and draw itself down if left connected to the tow vehicle. The LiFePO4 sits at 13.2 - 13.3V, compared to 12.6 - 12.8V for the lead acid starting battery. As a result there might be a small current that flows to the truck battery, and any parasitic loads from the truck will be carried by the lithium battery.

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