Beginners Guide to Processing 18650 Cells | Cell Database


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Mini-Powerwall
#21
7S is 24V, not 8S. And 8P still isn't enough, you want a bit more that that, even with 24V. If you plan to use the 300W that is. 15P for reused laptop battery cells.

That inverter seems pretty expensive for a 300W unit, but I'm not familiar with your market. Here in Germany I can buy a decent quality 24V 300W pure sine wave inverter for about 80 EUR. That's about 95 USD. I suggest looking at established companies or brands that belong to a shop, i.e. hardware by some OEM sold under its own label. They usually don't want to sell some shit because it has their name on it. And only buy a unit with a comprehensive documentation/specification that is presented to you up front. If you have to search for basic information -> look for another product.
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#22
I think I have a good handle on the battery pack and inverter, now what about the solar setup?  If my understanding is correct I'll need a BMS unless I'm only charging at 3-4V right?  Otherwise I risk damaging the batteries/fire.  Wonder what others have used for smaller setups.

Thanks,
-ck
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#23
There is no direct relation between a BMS and the charging voltage. The BMS can do several things for you, depending on what you want to install, and balance charging can be one of these things. But that is usually something for smaller batteries and so it could also be that charging is under no circumstances handled by the BMS. You solar charge controller will usually charge the battery, hence the name, and the necessary charging voltage is given by configuration of the battery. Ideally it can handle lithium batteries and isn't solely made for lead acid.
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