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German Powerwall 280xLG 18650MJ1 7s40p+ 450Wp Balcony PV System and a small question
#4
To answer you question about adding second hand cells. I don't believe it will shorten the life expectancy. Just be very careful of cells that show signs of self discharge. Also if you want to further increase the life expectancy do not use the full capacity of the battery. By only charging to 4.1v you will significantly increase the cycle life. As there is is only a small gain in usable capacity going from 4.1-4.2v. Same goes for the cutoff voltage, there is very little capacity left after about 3.5v (say about 3.2-3.3v under load).

By only charging to 4.1v and cutting off at say 3.3v you will loose maybe 20% of capacity.

The same also works for discharge current. By not drawing large currents from your batteries this will also increase their life expectancy.

For more information Battery University has an excellent article detailing how to prolong lithium based batteries.
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RE: German Powerwall 280xLG 18650MJ1 7s40p+ 450Wp Balcony PV System and a small question - by Geek - 04-04-2019, 03:17 AM

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