Inverter for used Tesla module (6s)

Jacob89

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Joined
May 11, 2019
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Hi all. I've just purchased a used 24v (6s) tesla battery module. I bought it because I haven't been able to easily source enough used cells cheaply enough for it to be worth putting together my own pack.
The problem of course is that it is only a 6s pack, and for a 24v system a 7s configuration would be better. It wouldn't be an issue except the minimum input voltage for most 24v inverters seems to be around 21v, and since I don't want to charge my pack much past 24.5v, that would allow me to use only maybe 50-60% of the capacity of my pack.
For cost reasons I've been thinking about using an MPPsolar PIP-3024MSE. But the minimum input voltage for it is 21v, and also the minimum that the charge voltage can be set to is 25v, which is a bit higher than I am comfortable taking my pack.I understand though that some people are running alternative firmware on the PIP inverters, so I was wondering if there was any alternative firmware that would allow me to change the minimum input voltage to 19-20v and prevent the charge controller from going above 24.5v. If not I though I could use a voltage relay to disconnect my panels from the inverter when the voltage hits 24.5, or turn on a diversion load to prevent the voltage climbing any higher. But that doesn't help with the minimum voltage issue.

Alternatively I could stretch my budget and get a Victron Multiplus 24/3000, which would take care of the low voltage issue (they go down to 19v), but I would have to stretch even further for a separate charge controller.
 
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