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Increase current battery storage


Tsa
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Hi all

Currently running 2x Dyness 2.4kwh batteries on Growatt 5000spf hybrid. What are my options if I want to increase this? 

1) must I again use Dyness or can I use any Lithiumion? Pylontech? DIY? 

2) must it be 2.4 or can it be the 3.6kwh or even 4.8kwh batteries? 

From what I have read, best is to make new batteries the Master and the older ones slaves. 

I'm guessing I will have to stick to Dyness or other brand with the same bulk charging voltages. 

Thanks 

 

 

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Thanks, thats ideal yes, the question is just how would that setup physically work?

So now you have Inverter talking to battery pack (Dyness or Pylontech) BMS with specific paramaters for charging, cut off etc. 

Now do you just parallel your new battery pack (be it DIY or another Dyness\Pylon) and who says the parameters that are configured are compatable with the DIY cells?

 

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On 2020/03/04 at 12:42 PM, Tsa said:

Now do you just parallel your new battery pack

Yes. Build another 15 LiFePO4 bank with its own BMS, simply connect + and - with your existing pack and there you go.

 

On 2020/03/04 at 12:42 PM, Tsa said:

who says the parameters that are configured are compatable with the DIY cells?

I do ;)

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17 hours ago, RikH said:

Yes. Build another 15 LiFePO4 bank with its own BMS, simply connect + and - with your existing pack and there you go.

 

I do ;)

I intend to do exactly this but @weber suggests that paralleling old Lifepo4 batteries with a new one will kill the batteries.

 Have you done this before and what was your experience?

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On 2020/03/08 at 12:21 AM, ojeysky said:

but @weber suggests that paralleling old Lifepo4 batteries with a new one will kill the batteries

I thought I was a bit more nuanced than that. 🤣 I did give at least one suggestion for making it work.

https://powerforum.co.za/topic/4614-axpert-settings-for-lifepo4/page/2/?tab=comments#comment-70618

 

Edited by weber
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On 2020/03/07 at 3:21 PM, ojeysky said:

 Have you done this before and what was your experience?

Paralleling is what these DIY powerwall guys do all the time with batteries that test very different. I've made a 12p14s battery once with Li-ion 26650's and that thing does it very well. But these are no big fat LiFePO4 prismatic cells off course. But I wouldn't know why not to parallel these big cells even when they are not the same capacity. You only have to look after well matched sets of parallel cells. So let's say you have 15 cells that where originally 100 Ah and now maybe 80 connect each old cell to a new 100 Ah and you have 180 Ah again. What @weber said is more for lead acids I'm afraid.

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