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German Powerwall 280xLG 18650MJ1 7s40p+ 450Wp Balcony PV System and a small question
(04-12-2019, 09:50 AM)stevelectric Wrote: I think I somehow did not get your question right. A battery (pack) in my setup is 7s40p. After building it will have around 4.1V per cell, 28.7 at the terminals since the cells are almost fully charged. So I just need to wait until the existing packs to reach that same voltage which will happen some sunny day after noon to connect the new pack.

Balancing happens inside of the pack in my setup, therefore I don't need to check each parallel block voltage. But since a newly built pack should not be terribly disbalanced, I would not expect issues here.

I made good experiences joining them on high SoC, I don't think it matters much. Many BMS only balance on high SoC. My guess would be that the difference on voltages is less important on high SoC, therefore the equalizing currents are smaller. Between 3.6V and 3.7V the SoC difference is larger than between 4.1V and 4.2V.

Ok, you connected an existing 7s40p battery to another one in parallel?
In my case I use active balancing for each of the 7 p40 pack and want to use it further. So I need to upgrade the 7s40p battery to (for example) 7s80p.

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RE: German Powerwall 280xLG 18650MJ1 7s40p+ 450Wp Balcony PV System and a small question - by drbacke - 04-12-2019, 11:00 AM

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