AC500 + 2 B300K + 2 B300S + 1 B300S advice on the B300S

Product Discussion BLUETTI AC Series
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Hi ALL , so I have had my system for 3 years It powers my off grid trailer works great and I love it, several months ago bought 2 B300K to add more power and other reasons that may make sense but I got a really good deal on the 300K and just my thoughts that the 300S may be a thing of the past at some point so my question.
hooking up the 2 B300K and 2 B300S no problem…
what do I do with the other B300S I don’t believe I can hook the 3 B300S together with out issues or can I ???

appreciate advice

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@jsrore I hope the chart below helps. It is important to emphasize that the red P090D-P150D is an optional cable and needs to be purchased separately.

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great thanks for the info , i did not think that the AC500 would work correctly with 3 B300S batteries hooked up like that , i will try it out