The v2 uses IRFZ24N FETs in the output stage, so it is more sensitive to higher voltage.
I have the v2 working and I have been using 12.5V from the beginning.
I also limit the current consumption, initially 6.0 A to 6.5 A at the moment.
So, I'm a cautious person and I try to experience the correct use.
I have been using it for 16 months and the FETs I have installed are working after more than 8 thousand connections.
In the case of the v3, you can safely use 13.8V, where the output stage FETs are IRF510 type.
In this case, I would limit the current consumption in the same way as in the v2.
What is the correct value, you have to set it with experience.
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Gyula HA3HZ
HA3HZ