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  1. O

    Hacking the new Growatt WiFi-F modules

    Ah, thanks for pointing this out. I've fixed this issue in the code on GitHub so it will be properly disabled if the define is removed.
  2. O

    Hacking the new Growatt WiFi-F modules

    Just remove #define MQTT from line 1 in main.cpp, this will disable all the MQTT functions.
  3. O

    Hacking the new Growatt WiFi-F modules

    You need to import the code into PlatformIO, customise the values particular to your setup (most of which are in secrets.h and platformio.ini), then hit the upload button while the WiFi-F module is attached via RS232 and the ESP-07 is in serial bootloader mode (short the GPIO0 to GND while it's...
  4. O

    Not grounding panels

    Not true. Some inverters float the panels at very high voltages with respect to ground. An unlucky person who touched a faulty panel frame or rack could have a nasty surprise/early death. This is why proper earthing of mounting systems is considered mandatory by practically all panel, racking...
  5. O

    Grawatt drain it's battery below cut off percetage until it is flat

    I'm guessing setting 05 is set to Li? If this is the case, then your BMS is also involved in the logic around when and how charging takes place. In any case, I've never heard of a periodic full discharge occurring. It's certainly never happened on my system, but I'm not using BMS integration.
  6. O

    Hacking the new Growatt WiFi-F modules

    I use MQTT Dash to display all my data on Android devices. I've also built a display around the ESP32-2432S032 to show all my system's data in one place. It sources the information for the Growatt and JK BMS via MQTT in realtime.
  7. O

    Growatt protocol

    Here you go: https://watts247.com/manuals/gw/GrowattModBusProtocol.pdf Looks like the maximum charge current can be set using register #34.
  8. O

    PV string AB switch

    Would this mean that you'd have two normally separate PV strings connected in parallel to the working inverter when the switch was engaged? Or does the customer just want to be able to select which individual string the working inverter is sourcing it's PV input from? In either case, you can...
  9. O

    Affordable 24v DC to 24v DC chargers?

    I've used one of these before: https://www.aliexpress.com/item/1005005339033106.html?spm=a2g0o.order_list.order_list_main.5.75381802N6p20V Assuming we have two batteries (source and destination): With only the source battery connected to the boost converter, using a multimeter, the output...
  10. O

    Affordable 24v DC to 24v DC chargers?

    That's true, the heat output from the resister would reduce quite a bit once the batteries are outside their extremes of SOC, but so then would the rate of charge. There's little need to debate this as Andy had also tested this scenario: TLDW: About 50A for a few minutes, followed by current...
  11. O

    Affordable 24v DC to 24v DC chargers?

    If you're using the boost converter to both increase the charging voltage and limit current, then yes, the current will be fairly constant until the battery you're charging approaches the voltage of the boost converter. Then other factors come into play like the various resistances in the...
  12. O

    Affordable 24v DC to 24v DC chargers?

    All you really need to do is connect the two batteries in parallel with a current limiting device and a fuse for safety. There's plenty of voltage and current adjustable boost converters on Aliexpress that would do the job - you'd just set it to limit current to your desired maximum, and maybe...
  13. O

    What power output setting for off grid Mpp solar inverter in Australia. 220v or 240v?

    A 10% difference in voltage wouldn't make much of a difference for most loads. Mains voltage fluctuates quite a bit throughout a normal day anyway, so the voltage probably isn't what killed your fan. Is your inverter putting out a pure sign wave? Cheap "modified" sign wave or square wave...
  14. O

    Water pump run-time limiter

    We rely on rain water. The location is at the top of a very rocky mountain range, so wells aren't really much of an option, and there's no other permanent (or even temporary) natural water source for a long way. Plan B would be to have water brought in, so this little device will pay for itself...
  15. O

    Water pump run-time limiter

    I had an unusual problem to solve recently - I have a cabin that's completely off grid and not connected to any public water supply, running on stored tank water only. This is in a fairly arid area, so water is precious and can't be wasted. One risk that's been sitting in the back of my mind is...
  16. O

    DC breakers from China. Why bother.

    Any chance you could pop the breaker open to see if it has the expected arc quenching hardware? Some of the cheapest breakers from China are known to be little more than a crude switch with none of the expected safety features. I wouldn't write them all off though, there are still some...
  17. O

    Hacking the new Growatt WiFi-F modules

    No... that would be quite a different project. This one can write, though only to one register (inverter on/off). Reading a config and writing all values back would best be done through a different user interface.
  18. O

    Hacking the new Growatt WiFi-F modules

    Ah, that makes sense. Probably not such a concern for you now, however I've released a new version of the firmware that has native InfluxDB v2 support. I've been using the built-in InfluxDB replication over WireGuard to keep a remote second copy of my metrics, it's worked really well and is free.
  19. O

    Hacking the new Growatt WiFi-F modules

    Unless you're comfortable with building your own hardware, power supply, serial interface and analysing/modifying code to suit your system, a solution that's already tested and designed to run with your specific AIO model is the way to go.
  20. O

    Hacking the new Growatt WiFi-F modules

    Have you installed InfluxDB on your server? Grafana is only the presentation layer, it also needs the database running separately to store all the metrics. I've recently re-written the code to use the newer InfluxDB v2 protocol, which should make this easier to connect once you have InfluxDB...
  21. O

    Hacking the new Growatt WiFi-F modules

    The code will work on any ESP8266 based hardware, but your challenge will be with the serial interface and protocol. The native UART serial RX/TX is not likely to work without an intermediate IC (like the SIPEX SP3232), whcih I believe is used as a level shifter in the WiFi-F. The SPF 3000TL...
  22. O

    open source mppt's

    I've always wanted to try this approach. Anyone who monitors their MPPT closely will see that the voltage it determines to be the maximum power point doesn't vary much throughout the day - about 10% even with changing angle of the sun, cloud cover, etc. So the approach of holding a fixed array...
  23. O

    open source mppt's

    I made the TechBuilder 1kW MPPT board. It worked well for some tests, but the MPPT algorithm is somewhat simple and can get stuck on a false maximum power point. The author seems to have abandoned the project too, so it's only worth picking it up if you're able to troubleshoot any issues...
  24. O

    Growatt Standby & power save mode question

    No, do the opposite. Leave setting 19 as-is, but change 20 to 56v. This should make sure that the battery passes the low voltage threshold sooner to allow charging again. I'd recommend reading the thread I linked to to build an understanding of the strangeness of the Growatt charging algorithm.
  25. O

    Growatt Standby & power save mode question

    It all depends on the voltages. Assuming there's no comms between the BMS and Growatt, the Growatt has no idea what the battery state of charge is. It can only measure voltage, which is somewhat constant for LiFePO4 outside the extremes of the charge/discharge knees (above 90%, below 20%). My...
  26. O

    Growatt Standby & power save mode question

    Here you go: https://diysolarforum.com/threads/growatt-odd-behavior.22696/post-666236
  27. O

    Growatt Standby & power save mode question

    Is it possible that the battery voltage hasn't dropped sufficiently to require charging? Growatt AIOs have a battery voltage threshold that needs to be passed before the charging algorithm kicks back in again. With the unit in standby mode, it could take a very long time before the batteries...
  28. O

    SPF5000ES bus voltage

    I agree with @timselectric, the bus voltage looks ok, though the BMS must be interacting poorly with the Growatt. Change setting 05 to USE, choose some conservative voltages for your constant voltage and float settings and then monitor. I use 55.2 for CV and 54.7 float with very consistently...
  29. O

    Hacking the new Growatt WiFi-F modules

    The firmware in this thread is only tested and known to work on the WiFi-F. You might be best trying to contact Growatt directly to see if they can help.
  30. O

    Standard residential size 39" x 65" maximum wattage 2023

    There's a lot of reasons the market has moved away from small panel sizes - mostly driven by cost. As average system sizes (kW) increase rapidly, larger panels mean less frame material, less mounting hardware and less electrical connections. This benefits the consumer with lower installation...
  31. O

    Grounding of Solar Panels and Rails

    The method and best practice of grounding is usually specified by your mounting hardware manufacturer and local compliance standards. Here's a good reference that gives an idea of how it all works in a typical system...
  32. O

    How to drive common inverter LCD Display

    Looks like the typical LCD used on the Axpert line of AIO inverters and their clones/derivatives/rebrands. Why try to retrieve the data through the LCD interface when they have a perfectly good serial interface? Depending on the model, they're usually plain old RS232, or RS485. All the protocols...
  33. O

    Toyota Announces EV Battery Breakthrough

    As with all alleged battery breakthroughs, I'll have to see it to believe it. So many broken promises over the years has me irreversibly cynical. :LOL:
  34. O

    “Normal” Cell Delta at Charge Voltage

    Another thing to keep in mind is that the current most active balancers can move is entirely dependent on the delta voltage between adjacent cells. A 5A balancer might be able to move 5A current under ideal conditions with a very large, unrealistic cell voltage delta (>1V), however if your cells...
  35. O

    How to "hack" a IoT GPS tracker to gather more system data?

    The GV75MG you linked to does have a UART port, which according to the marketing material can support various external data sources like a CAN bus module and RFID reader. That being said, there's no information around how the device can be programmed or customized to interface with other...
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