Search found 1557 matches

by ElectricGod
Feb 21, 2018 1:41 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

you don't really think you will get customer service from a Chinese seller do you? They work 100% on bare minimum margins. Warranty replacement for this component is unlikely IMHO. I've gotten the best customer service I've ever received from AliExpress sellers where I lodged claims on, or shortly ...
by ElectricGod
Feb 21, 2018 1:17 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

see those 2 solder holes at the middle, right hand edge of the board? That's P-. Connect your EV here. If you care about having mosfets that control charge then run your charging port to C-. I'm never concerned with charge current. AT it's best, it's maybe 50% of discharge current so I never use C-...
by ElectricGod
Feb 21, 2018 11:52 am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

Just replace the little BT board on the back plane. If it costs you $10, I'll be surprised. I don't need to, they just plug in on my board. I only mentioned it since someone mentioned not being able to connect via Bluetooth. I was offering the possibility of a faulty BT module as a possible explana...
by ElectricGod
Feb 21, 2018 2:05 am
Forum: Items for Sale - New
Topic: Smartphone EV trip dashboard - Android/iOS - $99
Replies: 71
Views: 4146

Re: Smartphone EV trip dashboard - Android/iOS - $99

OMG!!! this thing is so cool! I think I need to buy one.

OK...shameless plug...They are pretty cool and Vadym is a great guy.
by ElectricGod
Feb 20, 2018 6:48 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

These 3 CZT5551 NPN transistors and 3 more on the other side of the board all look like they are in parallel. Perhaps they make up the power component for a regulator somehow? If they are depletion-mode FETs, then they can be used as a regulator the same way the Cycle Analyst from Grin Tech does it...
by ElectricGod
Feb 20, 2018 2:17 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

This is the one I'm talking about which is the same as the one you describe - separate charge and discharge FET banks. Board.jpg Clearly it doesn't share a common port, however the sellers recommended wiring diagram shows charge and discharge both wired to the same port which doesn't seem correct t...
by ElectricGod
Feb 20, 2018 2:09 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

I have one of these BMS units. Just installed it a week ago and working through its functionality. I alway hate when a board has conflicting markings - such as a separate place to solder P- and C-, but they tell you to put both wires on the C- tab. Why? Does anyone know if the P- port works? I'd li...
by ElectricGod
Feb 20, 2018 2:06 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

first to mind would be IRFB4115 capable of 150V, but resistance is very high (~10mOhm) would the IPP048N12N3G be a better alternative? (4.8mOhm) https://www.infineon.com/cms/en/product/power/mosfet/20v-300v-n-channel-power-mosfet/120v-300v-n-channel-power-mosfet/ipp048n12n3-g/ i still plan on putti...
by ElectricGod
Feb 20, 2018 12:04 am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

so anyway...20S was relatively easy to figure out...totally missed the option in the windows app. why isn't this in the android app too?

I had to undo these solder bridges too.

Image
by ElectricGod
Feb 19, 2018 7:14 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

@electricgod: .) my phone is brand new. it's a xiaomi mi mix2. with the original firmware it was working fine. rooted it, installed a beta rom from xiaomi to get oreo, and it failed to connect. well, at least i know how to make it work again -> downgrade. .) it wouldn't suprise me to see a voltage ...
by ElectricGod
Feb 19, 2018 7:04 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

I wouldn't pay too much heed to the individual cell voltages unless you've calibrated all cells using a Fluke or other high quality multimeter, same goes for the charging currrent. Cell voltages are pretty close to accurate...enough so that I don't need a cell log or a DMM. I test software for a li...
by ElectricGod
Feb 19, 2018 5:04 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

I could get used to this! I'm already lazy, but geez...never have to get up to go look at charge status ever again...I think I'm in love! I had a couple of low cells and they are coming up nicely. 4 and 16 were a good bit lower than the others in the pack when I started. http://i1055.photobucket.com...
by ElectricGod
Feb 19, 2018 4:59 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

Well cool...teach an old dog a new trick! I'm always careful to plug in from lowest to highest or to disconnect from highest to lowest. With regard to the power supply, I've reviewed the data sheet for the BQ76940 - which is the chip used on these units (up to 15S anyway) and it appears it can take...
by ElectricGod
Feb 19, 2018 4:16 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

Look that BT board up on amazon or ebay. I forget which board it is, but it's uber common. I doubt the back plane is your issue. I have two identical looking bluetooth adapters and two BMSs, one works with both BMSs, the other works with neither. I can communicate with both BMS units using the USB ...
by ElectricGod
Feb 19, 2018 4:15 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

I've never charged before on this BMS. I trust the watt meter on my charger, but the BMS app says 4.1 amps. http://i1055.photobucket.com/albums/s515/rkenders/EV%20Stuff/BMS/16-20S%20smart%20BMS/Smart%2016S%20BMS%20pack%20charging.jpg I put this together last night around 10pm and at the power leads ...
by ElectricGod
Feb 19, 2018 3:13 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

With regard to bluetooth connectivity issues, one of the two bluetooth adapters I have is faulty, the blue LED stays on constantly as soon as it's plugged in. The led shouldn't switch on constantly until the connection has been established. Look that BT board up on amazon or ebay. I forget which bo...
by ElectricGod
Feb 19, 2018 3:12 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

I suppose you could put the amp meter on the batt- balance wire. Why would the regulator circuit be connected to anything less than batt- and batt+? Everything else would be bad since it would drain lower cells faster than upper cells. at least i could test the most negative, most positive balance ...
by ElectricGod
Feb 19, 2018 3:08 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

The latest software can be found here. https://www.lithiumbatterypcb.com/smart-bms-software-download/ thank you, unfortunately this version doesn't work either for me. :( i had one minor version earlier 2.1.1010) What phone do you have? I bet there are current ROMS for it if it's remotely a known c...
by ElectricGod
Feb 19, 2018 3:01 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

That's a fair point, in the video I posted he is measuring the current on cell 14 only. I will measure mine with only ground and cell 7 connected and report back, unfortunately it will be a few days before I can report back. that's the problem, as the BMS is powered by all balance wires it's next t...
by ElectricGod
Feb 19, 2018 2:40 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

Yes, and I think the instructions warn to do the same. However I inadvertently smoked two sets of resistors when I made a mistake so I said I'd take a few chances as I thought the board was toast anyway. Luckily for me I was able to move 4 unused ones from the top channel down to replace the ones I...
by ElectricGod
Feb 19, 2018 2:33 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

Izeman... I have the 16-20S version and there's no K1 connector. Can you figure out where that goes to? Maybe it's just to the gates of the mosfets or to some control pin on a charge controller? http://i1055.photobucket.com/albums/s515/rkenders/EV%20Stuff/BMS/16-20S%20smart%20BMS/K1%20connector.jpg
by ElectricGod
Feb 19, 2018 2:30 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

I've only tried it with a 12S pack but yes it didn't suffer any ill effects from connecting and disconnecting cells in a random fashion so long as they were connected to the correct port. Well cool...teach an old dog a new trick! I'm always careful to plug in from lowest to highest or to disconnect...
by ElectricGod
Feb 19, 2018 2:28 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

Check out this video where he measures the standby current. The BMS goes into sleep mode at which it only draws 0.5mA, it jumps up to 5mA periodically to scan for activity on the UART. There are some errors in other parts of the video however. http://www.youtube.com/watch?v=ClGmMY0kXvQ&t=11m44s I t...
by ElectricGod
Feb 19, 2018 2:20 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

The balance connections make up a voltage divider. I think you need to connect all the elements of the divider or else you will blow up the BMS. That's not the case, you can connect them in any order so long as you connect the correct tap to the correct cell input port. If you connect a higher volt...
by ElectricGod
Feb 19, 2018 2:15 pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 180
Views: 6614

Re: bluetooth BMS?

first to mind would be IRFB4115 capable of 150V, but resistance is very high (~10mOhm) would the IPP048N12N3G be a better alternative? (4.8mOhm) https://www.infineon.com/cms/en/product/power/mosfet/20v-300v-n-channel-power-mosfet/120v-300v-n-channel-power-mosfet/ipp048n12n3-g/ i still plan on putti...