could a number of fires have been prevented if there were a fuse inline with the charging wire?
Possibly if someone got the idea to use a high power charger. Many BMSs have a separate MOSFET to control the charging, which would blow if you tried to put too much current through it, but those without a separate charge MOSFET would allow at least four times as much current through. In the case of the BMS above, it'll allow 25A before it shuts off. That much charge current would cook many of our typical ebike batteries that are supposed to be charged at 2A. A fuse at least gives some level of protection against people doing stupid things.
In your case, it doesn't matter, but probably best to leave the multi-pin connector 'til last, and always check its pin voltages before connecting to the BMS, as it's easy to get them out of sequence.
Thank for your reply. By what you’ve said the Daly’s sounds that they could be untrustworthy and a bit problematic. Almost sounds like the balancing feature didn’t stop or something. I thought I’d try a more expensive type as the cheaper ones seem to be nondescript, and I do like the balancing feature. Could you suggest another brand as I really don’t want to lose a battery?
I have seen in a Phylion battery a 'thermal' fuse on the charging circuit standing up under the BMS circuit board thats pushed down between two cells and embedded with white thermal goo. This fuse blows when the cells reach a certain temperature rather than due to excess current as far as I know. There was also two separate thermistors embedded with white paste in the cells.
Thanks I’ve looked at the BeMuchSafer 13S 35A 30A 48V Battery BMS, just to clarify, does the ‘switch’ operate the balance function?
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I’ve also seen this that is 2 wire ‘common port’.
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You need to read the details in the specification:I’ve also seen this that is 2 wire ‘common port’.
7S 10S 12S 13S 20A BeMuchSafer BMS 24V 36V 43V 48V PCM Common Port With On/Off Switch Temperature Sensor for DIY eBike Battery - AliExpress 44
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Sorry about needing to ask, but is it better to use a 3 wire version? I’m not understanding the need of a 3 wire if, as suggested I can ‘wire the charge negative to the P’?
Sorry I thought maybe ‘with switch’ (third one along,) was for turning balance function on or off.
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The switch switches the battery output on and off using the output MOSFETs. It's very difficult to get an acceptable solution with an external switch, so it's a very desirable feature, though there are other ways to add a switch to a BMS that doesn't have the pads for one.Sorry I thought maybe ‘with switch’ (third one along,) was for turning balance function on or off.
So maybe this one?
BeMuchSafer 13S 35A 30A 48V Battery BMS With On/Off Switch Balance Function Temperature Sensor 13S30A 13S35A BMS for DIY E-Bike - AliExpress 44
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2nd one ‘Color: 13S35A with SW’. Ignorance showing, what will the switch do?
Two wire BMS will charge/ discharge thru the same port so utilising the same switching components this can allow for greater current charge though in most cases will be detrimental to battery life.I’ve also seen this that is 2 wire ‘common port’.
7S 10S 12S 13S 20A BeMuchSafer BMS 24V 36V 43V 48V PCM Common Port With On/Off Switch Temperature Sensor for DIY eBike Battery - AliExpress 44
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Sorry about needing to ask, but is it better to use a 3 wire version? I’m not understanding the need of a 3 wire if, as suggested I can ‘wire the charge negative to the P’?
Thanks I think I will go with this one without switch but with balancing.
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