Sparfuchs
1 kW
- Joined
- Nov 22, 2020
- Messages
- 305
Hello EV friends,
I'm about to build a high current 19s (because not enough space for 20s) battery with this 8-20s smart ant bms.(https://de.aliexpress.com/item/32997552090.html?spm=a2g0o.order_list.0.0.577a5c5fmX4joO&gatewayAdapt=glo2deu)
I want to reduce the risk of damaging the battery or the controller in case anything goes wrong with the bms or controller. So i thought of a 200A "fuse switch" (Not sure about the name). But there are different possible positions. Btw... it's a common port bms.
1) Positive wire. Would directly cut the contact to the controller (or the charger) without doing anything with the bms.
2) Negative wire between bms and controller. Same thing without any any advantages or disadvantages to the first option I guess?
3) Negative between battery and bms. This would probably not turn of the bms because the thin ground wire of the strings is still connected, but it would maybe also protect the battery and bms from to much current ?
4) Same than option 3, but with the thin ground string also behind the switch. This sounds quite interesting to me because it would also turn off the bms right ? And it protects the bms, the controller and the battery, right ?
What would you do ? And what are your thoughts about battery protection and is there anything I haven't considered yet ?
And a short off topic question: this is the fuse switch I wanna use:
https://de.aliexpress.com/item/32997552090.html?spm=a2g0o.order_list.0.0.577a5c5fmX4joO&gatewayAdapt=glo2deu
It says "working voltage: up to 50V". Do you think it will work with my max. 78V Battery ? I haven't found a better one yet and thought it shouldn't be a problem right ?
Thanks a lot for your help.
Best regards
Sparfuchs
I'm about to build a high current 19s (because not enough space for 20s) battery with this 8-20s smart ant bms.(https://de.aliexpress.com/item/32997552090.html?spm=a2g0o.order_list.0.0.577a5c5fmX4joO&gatewayAdapt=glo2deu)
I want to reduce the risk of damaging the battery or the controller in case anything goes wrong with the bms or controller. So i thought of a 200A "fuse switch" (Not sure about the name). But there are different possible positions. Btw... it's a common port bms.
1) Positive wire. Would directly cut the contact to the controller (or the charger) without doing anything with the bms.
2) Negative wire between bms and controller. Same thing without any any advantages or disadvantages to the first option I guess?
3) Negative between battery and bms. This would probably not turn of the bms because the thin ground wire of the strings is still connected, but it would maybe also protect the battery and bms from to much current ?
4) Same than option 3, but with the thin ground string also behind the switch. This sounds quite interesting to me because it would also turn off the bms right ? And it protects the bms, the controller and the battery, right ?
What would you do ? And what are your thoughts about battery protection and is there anything I haven't considered yet ?
And a short off topic question: this is the fuse switch I wanna use:
https://de.aliexpress.com/item/32997552090.html?spm=a2g0o.order_list.0.0.577a5c5fmX4joO&gatewayAdapt=glo2deu
It says "working voltage: up to 50V". Do you think it will work with my max. 78V Battery ? I haven't found a better one yet and thought it shouldn't be a problem right ?
Thanks a lot for your help.
Best regards
Sparfuchs