hi all
i have some parts for sale
17 modules v4.4 without attinys and one collection pcb max 5k com speed (if single board use then max 9,6k)
you have to buy and solder the attiny chips
45eur
and two pcb for v4.5 modules with connectors to build a clean 14-16s system (max speed 10k)
20eur
location in germany, can send in eu
shipping cost are not incl.
It would worry me that those 12V pins is so easy to touch and cause damage.
good warning, I’m going to insulate them with heat shrink until the contact tip
does somebody know how to add a rj45 connector to the esp that is used on the diy bms controller?
this is the only hardware in my network that uses wifi, i want to get rid of it and disable the wifi on my router.
Hi, the Topic we had somewere earlier as well.
Unfortunately the ESP32 on the DIYbms board does not have enough pins available.
May an enhancement could be, that in a next version the WT32ETH01 board could be used for the controller.
I love to use that controller in regards to exactly this topic, as Wifi is not that reliable.
Isolated high voltage & isolated current shunt based on ADS1115 - #2 by Chris87.
Quick question regarding the MQTT messages.
I havent figured out what does label stand for:
What is this topic for:
Further i dont know the possible statuses or units:
EDIT: By switching on a single brain cell i was able two answer questions myself.
@stuart
just watched the new firmware upgrade video for the controller.
fantastic work.
but as you said the float mode is not for everyone.
i have a full battery detection at 56V then my hot water heater starts. if i float then it would detect not enough charging power and will shut down so i wont use this.
but maybe in future it will be useful for me
can you add a new rule for the relay trigger to the shunt?
on at x %, off at x % and a delay timer when switched on.
(maybe additional setting the mV deviation, to ensure the battey is really full and need no longer balancing)
this could solve my problem with the voltage trigger for my hot water system
Have you run out of relays on the controller?
is there a rule for soc in the controller? have not noticed that.
Hi @Adas .
I’ve tried to make any “internal” errors more visible in the web interface. If you click the “download” link, it will clear this error out (just delete the downloaded file afterwards).
If this error keeps returning, then we can take a look.
I’d like to report some bugs:
This triggered an avalanche of problems with settings:
Hi @philips, often a complete wipe of the firmware on the controller is a good idea.
However, I’m more concerned that the settings restore didn’t work.
Can you open a GitHub issue for this please, that’s the preferred way to get low level support.
Regards Stuart
Hi stuart and all the wonderful people here,
lookin for a way to monitor my nicd battery bank i found this:
How could this be implemented in your 16s design? (externally to make it simple, or replacing the balancer board).
From what i undertand you can use multiple inputs of the bms to get around the 4.5v limitation, and just find the sum of all the individual voltages.
Some components control the middle inputs to equalise the readings under 4.5v.
12v battery would use 3/4 inputs and 6v battery would use 2 inputs.
This would allow to monitor 12v lithium camper batteries, lead acid, agm, nicd and everything that you could think about…
Another question, the voltage limit is 65v does this mean you can only charge each cell to 4.06v in a 16s li.ion bank?
I would like to have a function in node RED that transforms all the data that arrives via mqtt from the controller into data that I can pass to Influx, especially the modbus_A90 data, and range of each bank data, since if I integrate directly to Influx, I do not receive this range of data .
But my knowledge is not enough to generate this function.
I copy it as I have it so that you can identify the errors I am making and, if necessary, suggest corrections.
Thank you very much in advance
const topic = msg.topic.split('/');
const message = topic[1];
var measurement = null;
var retentionPolicy = null;
var expiry = "";
var tags = "";
var data = "";
if (!isNaN(message)) {
measurement = "series";
tags = { bank: message,
series: topic[2].padStart(2, "0")
};
data = { voltage: msg.payload.voltage,
vMax: msg.payload.vMax,
vMin: msg.payload.vMin,
inttemp: msg.payload.inttemp,
exttemp: msg.payload.exttemp,
bypass: msg.payload.bypass,
PWM: msg.payload.PWM,
bypassT: msg.payload.bypassT,
bpc: msg.payload.bpc,
mAh: msg.payload.mAh
};
node.send([null, { topic: "diybms/series", bank: tags.bank, series: tags. series, payload: data}]);
} else if (message == 'status') {
measurement = "status";
tags = {};
data = { banks: msg.payload.banks,
cells: msg.payload.cells,
uptime: msg.payload.uptime,
commserr: msg.payload.commserr,
sent: msg.payload.sent,
received: msg.payload.received,
badcrc: msg.payload.badcrc,
ignored: msg.payload.ignored,
oos: msg.payload.oos,
roundtrip: msg.payload.roundtrip,
dynchargev: msg.payload.dynchargev,
dynchargec: msg.payload.dynchargec
};
} else if (message == 'modbus_A90') {
if (!msg.payload.valid || msg.payload.valid == 0) return;
measurement = "modbus_A90";
tags = {};
data = { valid: msg.payload.valid,
voltage: msg.payload.voltage,
current: msg.payload.currentm,
mAhIn: msg.payload.mAhIn,
mAhOut: msg.payload.mAhOut,
power: msg.payload.power,
temperature: msg.payload.temperature,
shuntmV: msg.payload.shuntmV,
relayState: msg.payload.relayState,
soc: msg.payload.soc
};
node.send([null, { topic: "diybms/modbus_A90", payload: data}]);
} else if (message == 'bank') {
measurement = "bank";
tags = { bank: topic[2] };
data = { voltage: msg.payload.voltage };
} else return;
return [{measurement: measurement, retentionPolicy: retentionPolicy, payload: [data, tags]}, null];
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Dear diyBMS community,
since a couple of month I’m following the project.
@Stuart Thanks a lot for your excellent work. The Videos are amazing and offer highly professional educational input. The forum and it’ members a source of inspiration. Thanks for all the information.
Right now I’m getting prepared to build a LiFePo battery as a DC-Store for our photovaltaic system. CATL’s Natrium based Batteries are not ready for the mass market yet. As a first initial pack, i will probably start with a 16 cells each 280Ah/3.3V (16S1P). Since I’m based in Germany and don’t want to go through direct shipping hassle from China, I prefere ordering via NKON (Eve LF280K v3 Prismatic 280Ah - LiFePO4 - 3.2V A-grade - Prismatisch - LiFePO4 - Wiederaufladbare Batterien | NKON). Current prices are abount 115€ to 120€ per cell.
There are a couple of projects and links in the internet that offer design and building proposals for cases (wood or metal based). Since I’d like to get a stackable design, I haven’t decided yet, which layout i will chose. But I’d like to choos diyBMS as the active balancing solution. It should allow to scale (one all-in-one board per powerpack, one controller-board in the master).
I will have time to solder and experiment in my spare time. So I’m willing to get my hands dirty on that.
Has anyone already implemented such an installation? Any advices?
What is the latest all-in-one board and a suitable controller?
Solved
you can get them with 0% vat if you are from germany check out nkon information
