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Connecting the Cellpacks
#1
Hi,

I'm done with adding the busbars to my packs.
Now I'm at the stage of creating a connecting solution and would like some input:

I planned a harness with 14 x XT90 connectors, to connect each pack to.
But as I want to add additional packs later when I have enough cells again without the need of more Longmons,
I want to add some multiplier connectors, compareable to the ones shown in this picture only linear instead of circular:



Additionally I want to integrate the Longmons into that multipliers:


The overall layout would then look like this:
 


So, what do you think about my solution?

regards

cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#2
Works.
Beware of the size of pack per longmon. Recommended is to stay within resonable limits like below 400Ah
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#3
Also be aware that the XT90 can only do a max of 90A continuous, and that's if they are the legit connectors, and not knockoffs.
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#4
(08-21-2019, 07:08 PM)daromer Wrote: Works.
Beware of the size of pack per longmon. Recommended is to stay within resonable limits like below 400Ah

Hi daromer,

400Ah per Longmon? OK, didn't know this. Thanks.

1st Level is 14S60P ~ 90Ah per cellpack.

regards

cadric

(08-21-2019, 08:20 PM)Korishan Wrote: Also be aware that the XT90 can only do a max of 90A continuous, and that's if they are the legit connectors, and not knockoffs.
Hi Korishan,

you're right, I have to keep this in mind. It would mean two levels with 60P cellpack could already be to much.
But I plan to charge/discharge each pack only with max. 30Amps. Also even this would cut the levels of additional 14S Cellpacks to max. 3.
Would you recommend some other type? Anderson style like average Joes? I read they can handle 50A.
Or does anyone have another Idea for the connectors for this kind of harness layout?


regards

cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#5
90A is what they say.. Dont go above half that long term is my recomended max current. They tend to get hot after a while..
XT60 30-40A max.


Read here regarding design: https://support.batrium.com/article/91-c...iderations
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#6
Ok,

then I have to rethink the solution for the harness connectors.
But the xt60 for each cellpack would fit the values of 30amps.
Maybe I also split them into positive and negativ ones.

Thanks all for your comments.
Time for bed now.

If anyone has additional infos, I would be lucky to read about.


regards

cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#7
You can get XT150 or the larger connectors used for truck batteries (Name?)

Dont undersize connectors. Smile
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
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#8
Anderson's will do 450A, the largest ones - assuming they are genuine.
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#9
I really like the Anderson Powerpole connectors myself over the XT series. They have the little guys that go down to 15 amps if you're making something small but then for the larger packs I tend to use two of the PP75s for each pack positive and negative. This is just because my busbar creates a loop anyway and the PP75s tend to be much cheaper than the larger SB120s and up (at least the genuine ones, not knock offs). They also allow you to separate or connect any amount of single terminal to any other terminal using roll pins which is nice. And theyre hermaphroditic (which usually isn't my cup of tea in normal every day life but works great here). Finally, they're all crimpable too.

The XT series I'm okay with for smaller packs, like RC batteries, but I think if you use the PP75s or PP120s once or twice, you'll see how robust they are.





In fairness the larger XTs like the ones below also allow you to mate two terminals together or separate them. They're basically bullet connectors

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#10
Gentlemen,

thanks you al for you input. I will keep it in mind for further development.
As I'm starting with 60P cellpack now and want the system to get going, I will start with using the xt60 now,
but will upgrade to bigger connectors when I have more cell packs to add to my system.

Thank you all again,

regards

cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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