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Good Chinese BMS review
#51
Hello,
Is posible fits 2 or 3 bms of 100A in parallel to manage 200-300 A of big powerwall with small and standard chinese bms ?
Thanks
Best regards
Luis
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#52
(06-15-2019, 10:12 PM)Luis Wrote: Hello,
Is posible fits 2 or 3 bms of 100A in parallel to manage 200-300 A of big powerwall with small and standard chinese bms ?
Thanks
Best regards
Luis

sort of ... no.

problem 1:  the disconnect voltage will be too low for large packs/strings.  whereas a 'small' (<50p) string/battery may bounce back ok, after discharge has been cutoff ... when you get to like 150p (~300AH) ... you will find that they don't 'bounce back' that much, unless the load was anywhere near C2 or even C4 might bounce back, but if you discharge at C10 (all capacity drained after 10 hours) then you probably will find your cells at a very low (~2.45V) voltage after cutoff.

problem 2: the balance/overcharge protection is basically useless, as it will likely go to 4.25V (or more!) before cutting off charge, and trying to 'balance' ,... (segway)

problem 3: you will never get any useful balance current/effect on the cheap ones, which are often limited to ~50mA of balance current.  might be better than nothing, but ... not really.

My suggestion would be to go to either a higher voltage (more s's), OR ... if that doesn't suit, and you still don't want to pay ($$) for good solution, then investigate Voltage Sensitive (controlled) Relays.  It might not be perfect (doesn't protect banks/cells from going low) it DOES stop strings/batteries getting out of control ... *shrug*.  Hope This Helps!
--    ----    ----    ----    ----    ----    ----    ----    ----    ----    --
all systems nominal... rock on.
-----------------------------------------------------------------------
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#53
Anyone gut any luck reading these BMS with a Bluetooth/Raspberry kind of setup? Would be interested too...
Only thing I found so far is this https://github.com/sw-home/FHEM-BluetoothSmartBMS, will try if I'm at my battery next time(remote location)
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#54
Hello
Im also interested in this bms does the unit have an extrrnal output which monitors the state of the unit?
I need to turn on off a contactor
Thanks
Battery is li iron using 18650s, 14s, 0p, and growing cell so far 300, untesteded.
Bms is a diy open source by stuartpittaway.
No solar yet, 
Building wind turbine, 48v im after a 48v motor if anybody has one for sale.
Cells 2000 to 2500ma.
Cells 1500 to 2000ma.
Cells 1000 to 1500ma.
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#55
(08-27-2019, 09:05 AM)Jonisingt35r Wrote: Hello
Im also interested in this bms does the unit have an extrrnal output which monitors the state of the unit?
I need to turn on off a contactor
Thanks

No, it just cuts internally by overvoltage or undervoltage.

(07-21-2019, 04:06 PM)runsnbunsn Wrote: Anyone gut any luck reading these BMS with a Bluetooth/Raspberry kind of setup? Would be interested too...
Only thing I found so far is this https://github.com/sw-home/FHEM-BluetoothSmartBMS, will try if I'm at my battery next time(remote location)
Not by Bluetooth, Raspberry-USB cable insert data to influxdb on same RPi, and shown with grafana, all with Daniel's ISO.

https://secondlifestorage.com/t-Esperyd%...PI-project
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#56
I think one or two people here has figured out how to get the data out of these chinese bms through python into grafana on a Raspberry Pi. By doing this it opens up the flexibility of the system and not rely on just a smartphone 'app'. It allows you to attach relays and other features.

Here's what I've found.
https://github.com/simat/BatteryMonitor/...n-protocol
It's part of this person's version of a BMS with a PIP.
https://github.com/simat/BatteryMonitor/wiki


Also just by looking at the module, it has 4 wires going to the Bluetooth module. I'd bet it's just a TTL serial communication, VCC, Ground, TX and RX. Just have to fiddle around to see what the baud rate is and you can interface it without bluetooth. Maybe someone here can confirm that's the case.
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#57
I actually like the Bluetooth connection since it provides perfect galvanic insulation. These BMS disconnect the negative battery terminal if in trouble and it would for sure be a very unpleasant experience if the comms cable then provides that missing link.
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#58
(07-21-2019, 04:06 PM)runsnbunsn Wrote: Anyone gut any luck reading these BMS with a Bluetooth/Raspberry kind of setup? Would be interested too...
Only thing I found so far is this https://github.com/sw-home/FHEM-BluetoothSmartBMS, will try if I'm at my battery next time(remote location)

got it connect to linux pc ( same as raspberry pi ) through Bluetooth and get cell voltages and balance data. working on a way to integrate those data to grafana.

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#59
Seems like nodejs. I use it to insert in influxdb and them watch it on grafana

Code:
    port.on("data", function(data1) {
        port.drain(function (error) {});
   //     console.log("data received: " + data1.toString('hex'));
        var data = Buffer.from(data1);
        var data3 = data.toString('hex');
        var cantidad_datos = data.length;
        
        console.log("datos recibidos: " + data3);
        
        var posicion = parseInt(data3.indexOf("dd04"));
        posicion = posicion /2;    
    
    if (comandoarecibir  =="04" && posicion >-1 && cantidad_datos >=35){
        SendDataToInflux("voltajes,pack=1 voltios="+data.readUIntBE(posicion+4, 2)/1000+"\n"+"voltajes,pack=2 voltios="+data.readUIntBE(posicion+6, 2)/1000+"\n"+"voltajes,pack=3 voltios="+data.readUIntBE(posicion+8, 2)/1000+"\n"+"voltajes,pack=4 voltios="+data.readUIntBE(posicion+10, 2)/1000+"\n"+"voltajes,pack=5 voltios="+data.readUIntBE(posicion+12, 2)/1000+"\n"+"voltajes,pack=6 voltios="+data.readUIntBE(posicion+14, 2)/1000+"\n"+"voltajes,pack=7 voltios="+data.readUIntBE(posicion+16, 2)/1000+"\n"+"voltajes,pack=8 voltios="+data.readUIntBE(posicion+18, 2)/1000+"\n"+"voltajes,pack=9 voltios="+data.readUIntBE(posicion+20, 2)/1000+"\n"+"voltajes,pack=10 voltios="+data.readUIntBE(posicion+22, 2)/1000+"\n"+"voltajes,pack=11 voltios="+data.readUIntBE(posicion+24, 2)/1000+"\n"+"voltajes,pack=12 voltios="+data.readUIntBE(posicion+26, 2)/1000+"\n"+"voltajes,pack=13 voltios="+data.readUIntBE(posicion+28, 2)/1000+"\n"+"voltajes,pack=14 voltios="+data.readUIntBE(posicion+30, 2)/1000)
        
         }
      });

Code:
function SendDataToInflux (data,url) {
        if (data) {
            var influxUrl = "http://localhost:8086/write?db=baterias&precision=s";
            console.log(data);
            request.post({
                headers: {
                'content-type': 'application/x-www-form-urlencoded'
                },
                url: url ? url : influxUrl,
                body: data
            }, function (error, response, body) {
                if (error) {
                    console.log('influx', error);
                }
            });
        }
    }

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#60
cool thanks
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