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the right shunt trip?
#1
Hi there,

I still need a Shunt Trip for my Powerwall for savety.
I know that a lot of you use these ABB S5 Shunt Trips, but I don't have enough space for this items.
I have a little cabinet where I installed the DC switches between my two Inverters and the Batteries.


you can see the cabinet in the middle between the Inverters

My question now is, can I use some of these items as shunt trip?


ABB

Siemens


Or do I need to use one of this ABB S5 ones?


Regards


cadric
1. Grid-Tie System 09.2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Offgrid System 09.2019 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048MS, Batrium WM4, 1st Battery Bank: 840 cells in 14S60P with 80Ah cap.
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#2
Whats the current you want to be able to trip?

S3N is smaller as example.

The ones you linked are shunt trips for normal breakers. Can you find Breakers large enough? In generall max is 63A only.
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The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#3
It looks like you linked the shunt trip coil / accessory for a breaker.  I believe you still need to pair that with a compatible breaker.  Also make sure your control signal voltages are compatible with your system.

I am using the ABB S3B with a 200A rating.

It all comes down to your current interrupt rating... I wanted something larger for the headroom, but as my system grows, 200A will be a reasonable rating for the breaker with 4 parallel sets of EV cells.





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#4
(01-02-2020, 10:04 PM)daromer Wrote: Whats the current you want to be able to trip?

S3N is smaller as example.

The ones you linked are shunt trips for normal breakers. Can you find Breakers large enough? In generall max is 63A only.

Hi daromer,

Yes I used 63A breakers, one for each Inverter.
Just Like you showed in your project page.
1. Grid-Tie System 09.2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Offgrid System 09.2019 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048MS, Batrium WM4, 1st Battery Bank: 840 cells in 14S60P with 80Ah cap.
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#5
From my understanding the shunt trip should go on the battery main feed to the system... you want to be able to remove the battery from the system entirely in a critical fault.

I can see some scenarios where tripping on the inverters breakers could be too far downstream.
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#6
(01-03-2020, 12:17 AM)Crimp Daddy Wrote: From my understanding the shunt trip should go on the battery main feed to the system... you want to be able to remove the battery from the system entirely in a critical fault.

I can see some scenarios where tripping on the inverters breakers could be too far downstream.

OK, that would mean I have to put it directly at the Batteries.
Then I have to rearange the setup.

Thanks for the hint.

Regards

cadric
1. Grid-Tie System 09.2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Offgrid System 09.2019 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048MS, Batrium WM4, 1st Battery Bank: 840 cells in 14S60P with 80Ah cap.
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#7
Yes, I think that would be ideal.

On a side note, if your inverter breakers are sized appropriately, you can still leave those breakers in place in case an inverter has an internal fault or high load condition, but would not need shunt trip capability.

On the flip side, your shunt trip located at the batteries could be a breaker if you can find one sized appropriately, but doesn't have to be used as one.  As of right now, I am using mine only to disconnect the batteries in an under voltage condition until my system grows.

Not the most applicable video to you, but I have some recorded content of how I used my ABB shunt trip.

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#8
The shunt trip that the bms should trip is the ones hooked from the batteries. The breakers on the output of the inverter is something else.
cadric likes this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#9
OK, I now see the need for a seperate Unit.
Thank you both for enlighting me.

Regards

cadric
1. Grid-Tie System 09.2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Offgrid System 09.2019 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048MS, Batrium WM4, 1st Battery Bank: 840 cells in 14S60P with 80Ah cap.
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#10
Yea - the shunt-trip should isolate the battery *completely* which includes things you don't normally think about such as the charge controllers and power taps - e.g. all electronics that are part of the circuit.
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