diy solar

diy solar

What's your opinion on the best BMS?

Ha Ha the good old man trap hmmm I like the spikes at the bottom of a pit myself lol I was having issues with drunk kids stealing the letterbox so rang the cops and asked all sorts of questions like building one out of heavy steel so when they removed it, it broke toes and electrifying it with an electric fence energizer .... I was promptly told no sorry I understand what your issue is but that's illegal pfft!
 
NwCali said:
You should realize if you live in the wrong place and someone gets hurt by this you could end up in prison...

One of my daughters friends dad was in prison over his place being stolen from (grow room/house)..... and he thought he'd be smart and make sure they paid a price if they entered again. They did, but so did he.
Click to expand...
I know but in the UK you have to help the thief's out with your gear, my opinion is if they want my stuff then there in for a shock (big one) lol, they shouldn't be doing what they are doing and deserve what they get.

I remember a farmer going to prison for shooting intruders in his home even when one came for him with a knife, at the end of the day they deserve what they get, the courts just slap there wrists and send them off on there way.
 
I decided to go with the QUCC relay bms is has a larger balance current and reviews are amazing for the BMS.

It also supports 7s-20s so there's more room for later expansion when I save enough money
 
liamgibbins said:
Just found this one..
Its a relay BMS, The QUCC 7s-20s bms
There is to many choices, I hate choice so indecisive.

The attractive thing for me is the balancing current of 260mA, so the cells Ballance faster.

a.aliexpress.com

129.5US $ 26% OFF|Qucc Smart Bms Relay Contactor 7s 8s 10s 12s 13s 14s 15s 16s 17s 20s 200a Li Ion Lifepo4 Bms 24v 36v 48v 60v 72v Bluetooth App - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com
Click to expand...
That is actually a JBD BMS, just FYI. I'm not sure about the latest models, but earlier they were using cheap relays that I would not trust. I know they are using newer model relays now, but I haven't tested them.
 
Just John said:
That is actually a JBD BMS, just FYI. I'm not sure about the latest models, but earlier they were using cheap relays that I would not trust. I know they are using newer model relays now, but I haven't tested them.
Click to expand...
Thanks for the reply, they have upgraded the relays on the models they are selling now.

The new ones with the better relay have alot of good reviews, I am still waiting for my batteries so I guess I will know if it's any good when they arrive lol
 
liamgibbins said:
Thanks for the reply, they have upgraded the relays on the models they are selling now.

The new ones with the better relay have alot of good reviews, I am still waiting for my batteries so I guess I will know if it's any good when they arrive lol
Click to expand...
Off grid garage has one. They did send him a new relay. Be aware if it disconnects charging for a high cell voltage, it also disconnects discharge. For a relay or contactor based BMS, I would prefer two relays.
 
MurphyGuy said:
Its an indication to the shallow meaningless thinking of the average American.. "all show and no go".

I have been reading internet forums and facebook groups dealing with solar, batteries and BMS's for almost 5 years now.. I think I'm a member of all of them.. LOL

I wouldn't put a Chinese BMS and a lithium battery in the same room with each other, let alone actually connect them.

There are only three BMS's I would consider at this point.. REC, Batrium, and Orion.. I use a REC myself, but may use a Batrium on my next battery.. Not because I'm unhappy with REC by any means, but just to expand my own experience.

I've heard good things about Orion as well, but I'm more familiar with Batrium at this point.
Click to expand...
You may want to add TAO BMS to that list - see the comparison chart I did... BMS comparison chart
 
I prefer the disconnect to disable the battery if it's to low incase the charge controller doesn't disconnect the DC loads and if my my relay or volt sensor fils to disconnect the inverter, a bit of redundancy.

Do you know if it still balances if it disconnects when a cell is to high?

I am also rigging up a relay to disconnect and divert the solar to a heater when the temperature gets to low.

Oh I also bought the uart to usb so I can monitor the BMS fromy computer (also got a usb to tj45 adapter to run the usb 30m to my computer)
 
liamgibbins said:
Do you know if it still balances if it disconnects when a cell is to high?
Click to expand...
I will test that and get back to you. I hadn't thought to check that, I don't normally charge to high cell voltage disconnect.
Since it is resistive balance (i.e. bleeds a low current off the high cells) it would make sense to.
 
Philtao said:
You may want to add TAO BMS to that list - see the comparison chart I did... BMS comparison chart
Click to expand...
Nice comprehensive cart there, awesome to see you putting in the time to do that.

The TAO BMS looks like a good addition to the list.

What I don't get with Solar charge controllers, inverters etc in 2021 is that most manufacturers don't include WiFi/ethernet server and pc software as standard, Bluetooth seems to be the standard and it's so limiting.
 
Horsefly said:
I too have a 24V system, and I have 3 of the JBD's. Two are 8S 100A, and one is 8S 60A. The two 100A go with my main system for our cabin (230Ah), with one being a spare. I have run both of them, calibrated them, and verified all the smart settings.

The 60A one is still in the box, but is to go with my "play" system made up of 8S 25Ah cells.

I mentioned calibration: One of my two JBD's was from Overkill Solar here in the U.S., and the other was directly from JBD. Overkill supposedly does calibration of the BMS before they ship it, but I found that with my somewhat expensive Fluke meter the voltages were still a bit off. The one directly from JBD was a little more off than the one from Overkill. I bought one of the USB dongles for the JBD BMS, which allows you to hook it up to a laptop to do the calibration. The Android app doesn't allow you to do calibration. Not sure about the iPhone app. Truth is both of these 100A 8S BMSs were close enough that it would have been OK without me tweaking the calibration, but I'm still glad I did it. Makes it so my Active Balancer can do an excellent job, as the cells show up as within 1mV at rest.
Click to expand...
so please confirm, is the 100a JBD a single port and truly 100 amps charge and discharge?
 
I have gone with the QUCC relay smart BMS with UART to usb module and a very long usb cable so I can monitor/set up via computer.

Usb to rj45 converter for a total length of 30m.

I am rigging up a heat mat with a temp sensor for the old British weather (supposed to snow tonight), the cells are due to be delivered in the next week or so..

So excited lol get rid of them lead acid batteries.

Has anyone had experience with ja solar panels? They have some 495w ones quite cheap.
 
Berseker said:
so please confirm, is the 100a JBD a single port and truly 100 amps charge and discharge?
Click to expand...
Like @Just John I haven't pushed it to the limit.

I had sent Steve @ Overkill a question about it, as I thought there as some chance of going over 100A for a few seconds. He said that the 100A 8S design can handle 280A for up to 10 seconds. I don't think I would try, but that was what he said.
 
Horsefly said:
Like @Just John I haven't pushed it to the limit.

I had sent Steve @ Overkill a question about it, as I thought there as some chance of going over 100A for a few seconds. He said that the 100A 8S design can handle 280A for up to 10 seconds. I don't think I would try, but that was what he said.
Click to expand...
Yes, unlike Daly, JBD will send you a spec sheet for your BMS if you ask.
JBD started out designing BMS for medical equipment, so they tend to be well documented and accurately rated.
I don't know which BMS you have or are considering, but ask them for a spec sheet, they will give it to you.

Daly on the other hand, they don't have a clue, nor do they have documentation. Daly usually works, but good luck if it doesn't.
 
liamgibbins said:
I have gone with the QUCC relay smart BMS with UART to usb module and a very long usb cable so I can monitor/set up via computer.

Usb to rj45 converter for a total length of 30m.

I am rigging up a heat mat with a temp sensor for the old British weather (supposed to snow tonight), the cells are due to be delivered in the next week or so..

So excited lol get rid of them lead acid batteries.

Has anyone had experience with ja solar panels? They have some 495w ones quite cheap.
Click to expand...
Did you get JA solar panels? How is it?
 
liamgibbins said:
Just found this one..
Its a relay BMS, The QUCC 7s-20s bms
There is to many choices, I hate choice so indecisive.

The attractive thing for me is the balancing current of 260mA, so the cells Ballance faster.

a.aliexpress.com

129.5US $ 26% OFF|Qucc Smart Bms Relay Contactor 7s 8s 10s 12s 13s 14s 15s 16s 17s 20s 200a Li Ion Lifepo4 Bms 24v 36v 48v 60v 72v Bluetooth App - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com
Click to expand...
Looks familiar.

www.aliexpress.com

152.73US $ |Jbd Smart Bms Continuous Current 300a Automatic Identifica 7-20s With Built-in Bluetooth Free Ntc Lifepo4 Bms Board Peak 1000a - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com www.aliexpress.com

I'll give you a hint, if you buy enough of them, JBD will customize them and slap your label on them.
 
alvirtuoso said:
Did you get JA solar panels? How is it?
Click to expand...
I haven't but I am looking into there 495w panels, they are very affordable, there factory looks semi automated from what I have seen on different sites etc.

I would like to know know about them as in the UK there is a few importers offering there panels at a decent price.
 
The QUCC smart BMS relay is really quite good and the software also shows graphs on voltage, current etc when you tap the voltage readout on the dash board.

You cal also calibrate the temperature sensor by clicking the temerature on the dashboard.

It's these little features that make all the difference
 
liamgibbins said:
The QUCC smart BMS relay is really quite good and the software also shows graphs on voltage, current etc when you tap the voltage readout on the dash board.

You cal also calibrate the temperature sensor by clicking the temerature on the dashboard.

It's these little features that make all the difference
Click to expand...
Wow, sounds nice.
Would you be kind enough to post screenshots
 
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