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14s BMS on a 13s battery, can I?
#1
Hi, I ordered this bms from china: 

https://www.ebay.co.uk/itm/48V-13S-45A-E...2749.l2649

The thing is, instead of sending me a 13s bms they sent me a 14s. Can I still use the bms by just leaving the 14th connector disconnected?

I would make a 14s battery instead but I already have a charger for 13s.
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#2
Send us a pic of what you actually got.
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

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#3




[Image: 27711315_1943576912336612_1316176878_o.j...e=5A75D054]
[Image: 27659079_1943576942336609_126117384_n.jp...e=5A763489]
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#4
(02-01-2018, 08:27 PM)António Pereira Wrote: Hi, I ordered this bms from china: 

https://www.ebay.co.uk/itm/48V-13S-45A-E...2749.l2649

The thing is, instead of sending me a 13s bms they sent me a 14s. Can I still use the bms by just leaving the 14th connector disconnected?

I would make a 14s battery instead but I already have a charger for 13s.

The ebay listing does say it's a 13s bms?
                                                Choose LiFe  Wink

                      May all your batteries be fully charged and perfectly balanced  Cool
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#5
(02-01-2018, 09:16 PM)Wattsup Wrote:
(02-01-2018, 08:27 PM)António Pereira Wrote: Hi, I ordered this bms from china: 

https://www.ebay.co.uk/itm/48V-13S-45A-E...2749.l2649

The thing is, instead of sending me a 13s bms they sent me a 14s. Can I still use the bms by just leaving the 14th connector disconnected?

I would make a 14s battery instead but I already have a charger for 13s.

The ebay listing does say it's a 13s bms?
Yes, the listing does say it's a 13s board but I got a 14 instead.
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#6
It might work but it may be looking for higher voltages. IE it may shutdown when still not empty or keep charging over the max 54.6V I would contact the seller about this
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#7
(02-01-2018, 09:26 PM)António Pereira Wrote:
(02-01-2018, 09:16 PM)Wattsup Wrote:
(02-01-2018, 08:27 PM)António Pereira Wrote: Hi, I ordered this bms from china: 

https://www.ebay.co.uk/itm/48V-13S-45A-E...2749.l2649

The thing is, instead of sending me a 13s bms they sent me a 14s. Can I still use the bms by just leaving the 14th connector disconnected?

I would make a 14s battery instead but I already have a charger for 13s.

The ebay listing does say it's a 13s bms?
Yes, the listing does say it's a 13s board but I got a 14 instead.

Sorry I didn't read your post properly   Shy
                                                Choose LiFe  Wink

                      May all your batteries be fully charged and perfectly balanced  Cool
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#8
(02-01-2018, 09:45 PM)jdeadman Wrote: It might work but it may be looking for higher voltages.   IE it may shutdown when still not empty or keep charging over the max 54.6V   I would contact the seller about this

I have but comunication has been dreadful, and he is only replying one message per day...
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#9
Some bms's will work with different Xs configurations than max. This is accomplished by shorting out two neighboring connections. So, it's possible to short out wire #13 and #14 together and that tells the bms to keep going. I'm not sure as I don't know the documentation for that board.
Some post the shorting pattern for taking a 14s and changing to a 9s. They'd short wires #2 and #3, #4 and #5, #7 and #9, #12 and #13 to go from 14s to 9s, for example.
The bms is looking for voltage on all wires, and I suppose this kinda "tricks" the bms into thinking there are 14 there even though there's not.
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#10
Well, the seller said they asked the supplier and they said it can be used on a 13s battery they say simply to not connect the 14th wire. I'll have to give it a go once I make the battery.
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