All the recently produced WFCO’s - the ones that end in -ad are auto detect. That’s what came in our 2022. You can check the auto detect feature if you have an amp meter on or in the battery.
Here’s how they are programmed: When the power converter is first connected to incoming AC, it starts a test of how quickly the battery can charge. If the battery can accept over 20 amps rate for 30 seconds ( it might be 40 seconds, but you’ll see) the converter assumes it’s lithium, and cranks up the voltage and current to a 55amp rate.
Only a lithium battery has a low enough impedance to accept a constant input greater than 20 amps for more than a short period of time, but, I found that the ETI installed wiring between the converter and battery was too long, so it would raise the impedance enough to where the auto detect would think it was a lead acid battery and charge it at a lower rate. Once I relocated the battery switch and removed 2/3s of the wire, I got the auto detect to virtually always discover that it’s connected to a lithium battery.
If you have an ETI installed WFCO converter, I’d check the part number. If it ends in an -ad, the switch is irrelevant. But you might need to do some rewiring for it to actually run in lithium mode….
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