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Voltage is 12v. Pin 9 is positive and 5 is ground. Pin 2 is Tx and 3 is Rx.

Great post!

I am not sure if that project would be compatible with the ESP32. I know there is a project called MicroPython that runs on the ESP32 that COULD work, but I haven't tried it. PM if you have a good idea on how to do it and also to share information.

Yes, you could get all the Modbus registers using the wifi port (it is more like a serial port talking Modbus) I don't use all registers, there are 800+ 16 bit registers.

I looked into Solar Assistant and looks good. I didn't want to hook up a raspberry pi to the inverter and wanted to implement Sunspec. I like the idea of replacing the board inside the original dongle and keep everything looking nice.

That is right, the small green board you see in the picture connects to the inverter serial port. I started working on this because I wanted to have detailed graphs and integrate the inverter with my Home Assistant. (I can now turn off air conditioners or increase the thermostat when the grid...

The idea is just to replace the card that comes inside the wifi dongle. It can be configured through wifi (acts as an access point). I will research about how to integrated with IFTTT, sounds like a great idea. -Thank you

I also own a Solark unit which I like very much. Where I live I loose Internet access frequently and have made a custom PCB to replace the inner board of the Solark WiFi dongle. My goal is to have local monitoring and interact with other smart home components. It retrieves the information from...

My best guess is that they are concerned about customers connecting something incorrectly and damaging their unit when using the RS485 or CANBUS ports. The user guide has a warning saying "Use the information below at your own risk, any damage cause by the improper use of the communications...

Very good information, thank you!

If you look at their documentation it says that the inverter supports Sunspec draft 4. Sunspec's mission is to create open standards for equipment interoperability, here's the link to their mission page. I did some captures using a logic analyzer and figured out they didn't support it and...

I built a 2p16s pack (32 cells) about 4 months ago. Although the battery was working great, some cells (2p) where discharging faster than others. I decided to measure the internal resistance and combine the lowest resistance cells with the higher resistance them to balance the 2p packs to see if...

That is right, they should release a bigger power supply for the 18A version. I use their 800W for the 12A version.

They just released a new one that can output 18A https://www.aliexpress.com/item/1005001488070904.html

That power supply looks good, goes up to 120V! I received the Riden power supply above and I am very happy with it. I really like that it has a separate battery charging port and it calculates how much power it puts into the battery in Ah and Wh. I can connect it to my phone via Bluetooth or my...

My first pack of prismatic cell will arrive next week. I think I will use Panduit Dura-Ty to compress the cells with plywood of the same size of the cells at both ends. I have used them before for telecommunications work and they are very strong.

Thank you!

Sorry, you are completely right! I will have 4x 3.2v batteries to make one 12v 280Ah battery. I was going to purchase 32 batteries for my home system and ended ordering 4 extra to use on the sailboat. I was thinking about using a separate port BMS, but I will rethink everything per your...

I also have a 3x 100Ah AGM batteries and will change them for one 3x 280Ah 3.2V batteries. What BMS did you end up using?

Nice work! I have seen comments that those batteries should not be installed in a vertical position, not sure about it. Can you share the link for that case? Thanks!

I was planning on purchasing a charger to balance and test a 16S, 280Ah battery bank. I don't want to spend a lot of money on this, and would like to be able to use it for other purpose later on. The best option I have found is a Riden RD6012W pack with a 70V, 800W power supply. It is a 0-60V...

I found your post because I was trying to place an order with them and my CC always failed. I tried two different cards and they both failed, but if I place an order with a different vendor it works fine. I sent them a message and they asked me to pay through Paypal directly to an email address...