James340
10 W
Did you Measure the voltage of the groups to know it was balanced?.I don't think it is balanced.My 13s3p 14ah battery only has 5.6 ah when it was .6 volts out of balance.
Active balancer for 13s?
- Thread starter Cyclomania
- Start date
Cyclomania
10 kW
Yes I measured both actually. Also the balancer has like a blinking red light for the groups that are out of balance. When those lights turned off it was balanced. I measured both in the pins and with mutimeter going over all the cell groups.
But this was around 44 volts. It could have possibly gotten out of balance again during charging ? Perhaps because one of the cells in there is wonky or what could otherwise be the reason for this?
docw009
1 MW
Don't worry about the active balancer. If you're going to poke around at the battery, the best thing you can do is to measure all 13 groups and see how far apart they are.
Otherwise, put it back on the charger and give it some time. If you bought a balance BMS, it will try to balance. Probably take 2-5 more hours to bring the voltage up another volt.
Otherwise, put it back on the charger and give it some time. If you bought a balance BMS, it will try to balance. Probably take 2-5 more hours to bring the voltage up another volt.
Cyclomania
10 kW
They were not far apart before charging.
Cyclomania
10 kW
Hmm leave the charger in there you mean? Even though it has turned green? The BMS might try to balance even if it has turned green yeah?
James340
10 W
Cyclomania
10 kW
Yeah but this was the ball park. They were very close.
I do suspect this could be an issue with one of the cells though that I might have missed. Chatgpt says that if one of the cells has bad internal resistance it might reach 4,2 volts much earlier making the BMS shut off charging. Perhaps this could be the issue?
Cyclomania
10 kW
I have now measured my other battery and I think maybe the multimeter could have drifted out of controll. Because it shows 53,3 for both these batteries at fully charge. Any idea why? Do they degrade over time these mutimeters I suppose?
docw009
1 MW
My multimeters tend to read higher when their batteries get worn out. You can always measure the charger by itself, nothing connected, to see what your meter tells you,
Cyclomania
10 kW
I have charged it up with two different chargers (and gotten the same result) now, so I guess it is probably the multimeter ?
I will try to change the batteries in it later.
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Cyclomania
10 kW
I changed batteries in the multimeter and one of them now charges to 53,8 and the other to 53,3. I guess this might also be normal since these batteries have been used for a log time. Might not necessarily be unblanced. Could also be wear on the cells right?
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If every cell section has same voltage then they are balanced. Did you measure them separately?
And lower charging voltage means maybe your BMS cuts chargign at 4.1V instead of 4.2? Since you have the volt meter - check what's the voltage output of the charger too.
And lower charging voltage means maybe your BMS cuts chargign at 4.1V instead of 4.2? Since you have the volt meter - check what's the voltage output of the charger too.
Cyclomania
10 kW
Yes I think it does cut charging earlier. Perhaps but I am not sure. This is the instructions for it if it tells you anything. Mine is the one circled in green of 13s40a.
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docw009
1 MW
Please. Measure both the charger output voltages alone, with no battery connected, with your multimeter. Then you will know whether the battery is at or below the charger voltage,
Cyclomania
10 kW
How do I balance using a bulb? I think I might have to do that just to make sure they are very balanced. Since I am using a Daly BMS(red one passive balance), and I do not find an active balancer for this particular BMS.
Cyclomania
10 kW
I have measured both now. One shows 55,2 the other 54,5
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James340
10 W
This balancer is separate from the BMS.You connect the wires to the series same as BMS b- b1 b2 ect.You can buy extra connecters for other batteries/packs.
James340
10 W
When you connect+- of a single series it's independent of the rest.It is just 1 parallel group.I used a 12 volt 50 watt bulb to discharge the high groups.
Cyclomania
10 kW
Aha works like a balancer right? Just connect it manually or something right?
Chalo
100 TW
Active balancers I have used consume less than 25 microamps when standing by (according to spec). So when I install one, I leave it attached.
I prefer to use an active balancer only, and configure my bike and charger so that the battery's other limits are observed without BMS intervention.
I prefer to use an active balancer only, and configure my bike and charger so that the battery's other limits are observed without BMS intervention.
Cyclomania
10 kW
Hmm you install an active balancer instead of a BMS?
Have it there instead of the BMS?What is the difference between that and a regular BMS? What are the pros and cons? I also thought about that but I read somewhere it had some downsides but I cannot remember where I read it and what were the downsides
James340
10 W
It's a active balancer! The battery BMS main function is to prevent over discharge and under discharge it has very limited balance function.I have cheap Chinese batteries and they go out of balance when abused.
lnanek
10 kW
- Joined
- Sep 26, 2022
- Messages
- 607
It's true that my controller has a programmable max battery amps and low voltage cut off. Doesn't have a temperature probe for the pack and can't measure the voltage of the individual p-groups, though. So can't implement any protections based on those.
James340
10 W
I was using the PCB board style but they are not accurate.This is the balancer connected to a battery
Cyclomania
10 kW
Hmm I found connectors that look like the ones in your image here: https://www.aliexpress.com/item/1005007029621946.html?spm=a2g0o.productlist.main.1.612f5df0YZXAaS&algo_pvid=e72b293a-dfd8-4302-aa9e-f2f59ee3c80e&algo_exp_id=e72b293a-dfd8-4302-aa9e-f2f59ee3c80e-0&pdp_npi=4@dis!EUR!1.34!1.34!!!10.00!10.00!@2103868a17321776047197848eca34!12000039151204596!sea!NO!167266123!X&curPageLogUid=ShKuywneBgqc&utparam-url=scene:search|query_from:
But I did not find that specific machine/equaliser you have in the picture. Do you have a link to that one or what is that called? If I understand you correctly you have soldered/created an interface between the connector pin of an incompatible connector pin, from a BMS, to those connectors above at the other end that makes it possible to hook it up to your equaliser through that cable/interface? thanks
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