New Power solar storage from Tesla Module S 24v/250Ah

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Hi all
I open this tread for my Storage battery Off-grid system .
I already bought by ebay, the second hand 2 x 24v/250Ah Tesla batt.Max voltage 50.4 v Min 42v (if will be Ok I will go toorder 4 more pc)
I had already in my system 48v/400Ah Bank Gel Batt UCG 12 200 ->8 ea Float 54.6V bulk 57.6v.
my I ask : I can run in paralel the above battery bank?
Also I need an idea for how I will goto use the BMS from them?


My system :
2 x PIP-4048MS /paralel mode; PV- 12x 240w poli + 9 x 260w poli (each PV group on the single invertor); 2 x 4 UCG 12v 200AH,

My Idea .
Is will use the PIP Aux contact to open one DC power contactor when the Tesla battery reach to 50V.
For avoid the triggering repeat of theDCcontactor , I will use one control Timer Relay 5-20sec
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Do you have the full protocol so the pip can communicate with the bms?

First is to check if PIP-4048MS can work in the range 42-54.6, I supose it can, then I will use one set of panels and one battery for every PIP, voltages of batteries are very different to connect them in paralel.

Welcome!

The Tesla modules are 6S, two of them in series don't really fit a 48V system. 12S is 36V to 50.4V, or 39.6V to 50.4 if you use the Tesla BMS, it cuts off at 3.3V I think. The voltage isn't really high enough. You have to be careful. 48V LA is more like 40.8V to 57.6 so you can't use them in parallel over their entire capacity.

Thanks a lot
But I use paralel battery till the both reached to 50v .
Charging :When they reach to 50v , both Battery the DC Contactor (200A DC) connected to Tesla Lit bat + became off ,and only Gel Batt remain to be full charge.
Discharging : When Gel battery reached to 50v the DC Contactor (200A DC) connect on paralel the Tesla Lit ,and both of them start to be discharge till reach to 46v.

Joost2 said:

Do you have the full protocol so the pip can communicate with the bms?

Click to expand...

I have no any comunicate with BMS.
I want to find a way.