Recent content by shvm

Will Charge Last feature be ever offered for LXP SNA 5k ?? I live in an area with frequent power cuts and I'd like my battery to be charged only when powercuts happen.

Far more important is to cover them with a tarpaulin or something. No light falling onto the panels, no degradation. Additionally prevents unwanted dust from accumulating. You can leave the string connected as it is. That way you will have easier time preparing them for use when needed.

They communicate with each other over RS485 but can communicate with the AIO using both CAN/RS485. Then your best bet would be CAN. It is very easy to DIY, plus the various protocols are already very well documented, tested. JK-BMS using UART/BLE and using CAN. Try reading through this and...

Thank you for taking the time to meticulously document everything for others. Looks like we need to explicitly state everyone to keep everything updated beforehand.

I have been opening (and destroying) stuff ever since I was a 5yo child. I was privileged to have access to an entire bag of tools to play around. But, even then if you had asked me this just four years ago, I'd have no clue. All this time, I simply relied upon; if it's a flat screw, then flat...

Yes. This should be your CAN Tx and Rx GPIO pins. This is where wires coming from JK-BMS go. Tx-Rx and Rx-Tx. You can always swap the pins in software if it doesn't work in the first try.

I can speak for my Luxpower unit instead, Initially, it usually involves changing battery mode from Lead Acid to Lithium with the CAN protocol to use. The inverter then reboots automatically.

This file is doing exactly that. https://github.com/Sleeper85/esphome-jk-bms-can/blob/main/ESP32_LFP_BLE_jk-bms-can.yaml Connect to a JK-BMS with BLE, send that data to the inverter over CAN. And all this while being connected to your home WIFI and reporting sensor entities for HA. And one can...

There is already UART+BLE hybrid version and it is fully functional in my own home for two months now. The approach to avoid collision is to poll sensors common to both interfaces only once. For example, battery voltage is common to both UART and BLE. in a hybrid file, if you're polling voltage...

Yes yes. But one esp32 can already do both functions at once. Report data to home assistant. Connect to BMS over UART, send data over CAN and also fetch data over BT. Four things at once, actually. They're really that powerful !

I live in an area with frequent power-cuts so I can't even imagine this disabled.

One thing I can tell you it is not a battery specific problem. Rather something on the AIO side. I have noticed this too with DIY battery and LXP SNA 5k. EG4 units are also based on the LuxPower units. So we both are observing the same behaviour. Here is my HA history showing constant power...

Battery voltage STILL IS the primary indicator of whether a battery is charged or discharged fully. It is only in-between that we struggle when it comes to correlating voltage with SOC. But as long as approximations are good, hardly anybody cares. Why should we, when we know that voltage is the...

Any voltage between [3.65 V to FCV] (which I'm taking as 3.37V) is acceptable target bulk voltage in the model. I personally use 3.525 V/Cell Are you really sure you read 5 pages deep into the thread?? :cautious: I am repeating this again. Unless you go and put the effort to understand what is...

Smart! Take your best Voltmeter, capable of highest precision and measure the FCV of a cell, with and without a resistor in series. Entertain us on a video for everyone to see. Let's face the physical reality together. Proportionality only applies to a two-way street. Add a resistor in series...