Horsefly
Solar Wizard
Whoa Steve! I'm thinking you didn't mean 4.250V per cell, right?! I thought you were charging to 3.45V per. Knowing what I've seen from you before, I feel fairly certain you would never approach 4.25V - Correct me if I'm wrong!
Hankzor JK BMS with screen and power button
- Thread starter upnorthandpersonal
- Start date
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
HOLY MACARONI ! Typos EDITED !
What can I say, the drugs for Necrotising Pnemonia & Cancers do get to me sometimes & sneak Up.
BTW - shhhh... Just sent edited/revised manuals to Hankzor-JKBMS'. Phew what a job, nowhere near as bad as all the Chargery BMS Manuals were. That took me 2+ Months with the graphics and everything. Hopefully will be rechecked, verified & put out ASAP.
Others, I am now All JKBMS but not in a position to support or help much, only when I can and minimally at that. Higher Priorities.
burgerking
New Member
I can relate with you, albeit with allergy drugs.
And GOOD JOB!?????????????????
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Possibly amazon or eBay but where it comes from OR age of stock ????
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Believe it or not... Shoving a light piece like that on airfreight is pretty cheap really. Heavier "airmail" really. Few bucks and in a few days in your hand. Just get screen and the rest all at once in a small package.
I hear ya, just can't really sit idle on the project for up to three weeks. I wanted the JK, but ended up ordering the JBD from Current Connected and had a tracking number in less than an hour and they're just one state over. Tough to beat. I may order a JK for another project that's less pressing.
Love the box! What is it? (looking for something like this for my 16S setup)
I made it using 2020 extrusion and plastic sheeting. I probably wouldn't do it again due to the cost. It does work well though.
Also the BMS worked flawlessly for a few months then suddenly died. the DIsplay is off, and the BMS has a red flashing light, and I can't connect to it any longer. I am not at all sure what happened and I have messaged HankzorBMS Store on ALiExpress but they keep telling me to connect to the unit with my app and a phone even after repeated messages saying it seems to have failed and can they help. Hopefully someone from HankzorBMS Store is still monitoring this thread and responds.
Update: The display died and no longer works. I could not connect to the unit with bluetooth but after disonnecting the battery leads on the BMS a couple of times, it showed up on my phone app again and looks like it is working. Weird.
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SolaroSsaurius
New Member
- Joined
- Aug 27, 2022
- Messages
- 171
@Nami ??
I'm about to buy BMSs for my long term living RV.
How can one trust this types of batteries for an RV??
One cannot afford to be hung without any power so easily!!
What have others done to prevent this??
Bergum
New Member
- Joined
- Jul 5, 2022
- Messages
- 16
You can(t).
But...
If you buy a complete ready buildt battery and it dies, the battery is dead.
If you build it yourself, the BMS os dead, but you still van use the battery if you are carful and monitor the battery while charging intil you get a new BMS...
SolaroSsaurius
New Member
- Joined
- Aug 27, 2022
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- 171
Unexpected, awesome response.
Maybe a cheaper/ just for emergencies / backup BMS will be in the spare's bin, then...
Maybe a cheaper/ just for emergencies / backup BMS will be in the spare's bin, then...
filippomasoni
New Member
Precisely what I'm planning to do for my camper. Still much cheaper to have a backup BMS than buy a built-in battery. IMO the cells are just chemistry, if they test fine they are unlikely to have significant damage, they can only degrade slowly over time and use, but a BMS is much more prone to a sudden failure if one of the many electronic components fails, and swapping it with a backup is pretty easy.
meetyg
Solar Addict
- Joined
- Jun 4, 2021
- Messages
- 1,124
Hi there.
I've been a JBD fan for quite a while...
But for my new 24v build, I decided to go with the JK BMS B2A8S20P and got the large display. I decided to go with the JK because I have been fed up with such low balance current of the JBDs.
Anyways, just hooked everything up yesterday for some testing. I really like the JK!
I got the large display because it shows cell voltage delta among other things.
But I wish it would have some features similar to the JBD large display:
1. Option to turn off the display WITHOUT turning off the BMS.
2. Option to turn on/off charging/discharging via the display.
I really don't see the need for the display to be always on. Is there an option to do this (without physically switching the power lead to the display)?
I see that the display has a JST connection on the back, next to the main connector. Does anyone know what this is for ? @Nami
BTW, I am using 2 x 6AWG for the B- and one 4 AWG for the P- (that's what I had at hand, otherwise I would do another 2 x 6awg).
Both are 200°C silicone insulated.
The 7awg was too short for me, and I think it underrated for this BMS anyways.
P.S. I went with cross bus bar connections, so that if I would need to redo top balancing in the future, I wouldn't need to take apart the whole pack. Just remove the busbars and connect in parallel. This made a nice an neat build, but only the dual B- got a bit messy...
I made a mistake, when putting the cells in the box: I should have moved them to the other side, just so the negative terminals will be more accessible to the BMS. But the cells are very compressed, so I'm reluctant to take everything apart. Also got the BMS mounted to the side with VHB tape, which is a pain to remove.
I've been a JBD fan for quite a while...
But for my new 24v build, I decided to go with the JK BMS B2A8S20P and got the large display. I decided to go with the JK because I have been fed up with such low balance current of the JBDs.
Anyways, just hooked everything up yesterday for some testing. I really like the JK!
I got the large display because it shows cell voltage delta among other things.
But I wish it would have some features similar to the JBD large display:
1. Option to turn off the display WITHOUT turning off the BMS.
2. Option to turn on/off charging/discharging via the display.
I really don't see the need for the display to be always on. Is there an option to do this (without physically switching the power lead to the display)?
I see that the display has a JST connection on the back, next to the main connector. Does anyone know what this is for ? @Nami
BTW, I am using 2 x 6AWG for the B- and one 4 AWG for the P- (that's what I had at hand, otherwise I would do another 2 x 6awg).
Both are 200°C silicone insulated.
The 7awg was too short for me, and I think it underrated for this BMS anyways.
P.S. I went with cross bus bar connections, so that if I would need to redo top balancing in the future, I wouldn't need to take apart the whole pack. Just remove the busbars and connect in parallel. This made a nice an neat build, but only the dual B- got a bit messy...
I made a mistake, when putting the cells in the box: I should have moved them to the other side, just so the negative terminals will be more accessible to the BMS. But the cells are very compressed, so I'm reluctant to take everything apart. Also got the BMS mounted to the side with VHB tape, which is a pain to remove.
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meetyg
Solar Addict
- Joined
- Jun 4, 2021
- Messages
- 1,124
After writing this, I thought about it and got the motivation to fix my pack.
I decided that just flipping the cells around would give a neater build, without having to move the BMS. Funny how things work out in your head after you write about them...
Here is how it looks like now (with display temporarily connected), much better:
Does it not turn off after a while? I thought I recall someone mentioning at least with the older smaller screen if the battery isn't being charged the screen will shut off after X minutes.
Don B. Cilly
Energetic energy padawan
Actually, the small screen turns off when the battery is being charged. It turns on when it's being discharged.
How silly that is you might want to ask whomever programmed it, but I put a separate voltmeter on it to see how the charge goes.
-
How silly that is you might want to ask whomever programmed it, but I put a separate voltmeter on it to see how the charge goes.
-
meetyg
Solar Addict
- Joined
- Jun 4, 2021
- Messages
- 1,124
Not that I've noticed (maybe I didn't wait enough). I also saw the smaller screen turn off by itself on Andy's review (@offgridgarage), but the larger one doesn't, at least not while battery is in standby.
intermit.tech
New Member
- Joined
- Oct 17, 2022
- Messages
- 3
I had a little question about the LCD screen feature, I was hoping to use the screen and RS485/Serial out at the same time. Reading on the Hankzor BMS store it mentions that you can't use the screen and RS485 at the same time because the screen basically uses the RS485 signal (Although it's connector seems to have the B and A signal in there).
But from checking all the pictures it seems like the LCD screen might be really using some RS485 pins where as the GPS pins (as if often stated) are actually UART pins which can then be converted to to RS485 using a little external box.
Looking at all the connectors the screen has it's own connector now and doesn't need the GPS/UART port anymore (as it did before I believe?).
So my question, does this mean you can have the LCD screen connected using it's LCD port and then still use the GPS/UART interface? Or are those actually the same pins and the LCD screen is a "RS485 Master" in that sense and thus no other controlling unit can be connected to the RS485 port? If so, would the CAN/RS485 port be able to be used as a second UART/RS485?
Hopefully my question is clear enough. ? Basically I want the nice LCD screen but also want to link it to an ESP32 or maybe a Victron inverter.
p.s. I'm looking to use a B2A20S20P/B2A24S20P
But from checking all the pictures it seems like the LCD screen might be really using some RS485 pins where as the GPS pins (as if often stated) are actually UART pins which can then be converted to to RS485 using a little external box.
Looking at all the connectors the screen has it's own connector now and doesn't need the GPS/UART port anymore (as it did before I believe?).
So my question, does this mean you can have the LCD screen connected using it's LCD port and then still use the GPS/UART interface? Or are those actually the same pins and the LCD screen is a "RS485 Master" in that sense and thus no other controlling unit can be connected to the RS485 port? If so, would the CAN/RS485 port be able to be used as a second UART/RS485?
Hopefully my question is clear enough. ? Basically I want the nice LCD screen but also want to link it to an ESP32 or maybe a Victron inverter.
p.s. I'm looking to use a B2A20S20P/B2A24S20P
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