Testing BMS for portable battery

That looks good. I'd like to see a review
 
Any updates on this? I'm accumulating batteries for a portable 1.7kw build right now. I've got a month or two to finish my plans for the BMS and monitoring while I get the batteries.
 
gpn said:
Any updates on this? I'm accumulating batteries for a portable 1.7kw build right now. I've got a month or two to finish my plans for the BMS and monitoring while I get the batteries.
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I probably should have mentioned in the title that this will be around BMS for portableLiFePO4 battery.
I have been running this

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/142426681058

on my LiFe test battery for pastcoupleof weeks, itvdoes what it says it will, as far as disconnect under high/ low voltage scenariosbut I have only tested it lightly with small loads.

I'm just setting up a 60 ah LiFe pack to run some more bmstests. I've just received and connected this one

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/221197492067

As far as the BMS8 in original post, I went to buy one but appears to be sold out or discontinued
 
I probably should have built my portable battery pack with LiFe cells but I've already started purchasing some INR18650-25R samsung cells... I was going to drive a 1000w pure sine inverter I have laying around with this battery as well as have some DC and USB outputs for accessories. I'd love to find a lower cost adjustable BMS that I can tune the high and low voltages to maximize battery life. Would like to cap the high end at 4.1 volts if I can but I'm having a hard time finding something that is reasonably priced that will do that.
 
Expect it to only do about 15-20A as apposed to the advertised 30A. And I can't tell what size resistors they are using for the balancing, but I'm gonna say take about 30% off what the balancing is stated as, too.
 
MattGross said:
I have a very small 100wh lifepo4 pack that I plan to use when servicing my larger 5kw just to keep the critical systems running. However it will be hooked up to my 300w panel so I'd like something that has a larger charge capacity. Curious how the Chargery BMS8 works for you. I'm also curious about this guy:

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/221197492067

thanks!
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The bms8 is on it's way to me.

I'll let you know how the other one you linked goes as well, as I have one on my 60ah camping battery ;)


image_nqwhtl.jpg


These ones seem ok, at least they cut off where they are supposed to.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com.au/ulk/itm/272776505568

Most Chinese bms have around 50 ma balance current. At least the bms8 says it has 300ma..we'll see how it goes!

There are a couple of other models made by chargery that look interesting
 
Got the BMS8 in the mail today ;)

Super fast postage! Well done Ali

Looks nice build.

Will test it out as soon as I get a chance, kind of busy trying to get my house ready for sale :rolleyes:



image_iqiisg.jpg


Size comparison with Samsung Galaxy S5


image_uahzca.jpg
 
Looking at that device it can NOT do 300mA on each channel for sure! Its way to small unless its powered by a fan and big cooling plates :p

But it can perhaps do 300mA on a single channel at a time.
 
daromer said:
Looking at that device it can NOT do 300mA on each channel for sure! Its way to small unless its powered by a fan and big fans :p

But it can perhaps do 300mA on a single channel at a time.
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WHAT..a seller over rating the specs of their product :p

We'll see how it goes ;)
 
I've connected the BMS8 to this 12v60ah LiFe pack.

Have had little time to test it as such but so far it seems to actively balance as shown by the red led in lower left of display.

Noticed sometimes it makes a high pitched squealing sound when balancing?


image_tefxbt.jpg



image_ylffnr.jpg


First thing i'll do is test low and high voltage cut off.
 
CrimpDaddy said:
I'd love more details about this item. It Looks decent!
Click to expand...

I still haven't had a chance to thoroughly test it yet. I saw in your other post you ordered one. Hope it works out ok for you :)
 
This may be a silly question but does this have adjustable parameters for charging and monitoring/discharging?
I'd like to get something that I can just leave hooked up to my solar MPPT and set to monitor and maintain.
When I need to use it I can set my minimum voltage alarm, 2.7V or whatever number.

Thanks
 
okent said:
This may be a silly question but does this have adjustable parameters for charging and monitoring/discharging?
I'd like to get something that I can just leave hooked up to my solar MPPT and set to monitor and maintain.
When I need to use it I can set my minimum voltage alarm, 2.7V or whatever number.

Thanks
Click to expand...

Hi
No it doesn't have adjustable parameters.
They do make more advanced models which I think do
 
I just received mine and I am a bit confused...

After getting it all hooked up, I tried to put a load (hobby charger) on my 6s battery and it would just error out and show a 0 on screen. Sometimes it would show a different error, but the unit would not turn on.

I was a bit puzzled and them swapped the inputs and outputs...

I originally connected the battery to B, and the Load to P... this did not work.

I swapped it and connected the batter to P, and the load to B, and I was able to get the charger to turn on.

Its getting late, I haven't really moved any current though it, and I have not tested any other things, but is even the website documentation has the battery connected to B.

Am I going crazy or it is backwards?
 
Here is what I received...

And I confirmed... I had it hooked up correctly per the manual and it didn't work. Same as WattsUp picture.

The only thing I didn't have plugged in was the temp sensor, and I will try again with that, but so far the experience has been a bit disappointing considering this cost $30.

It also makes a high pitched squealing nose, but that has to do with the display being on or off. I never saw the balance LED come on, but its only sitting at 4v per cell right now with a very small delta.

further testing is in order.


image_fftsqt.jpg



image_soqgyp.jpg



image_xyvinq.jpg
 
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