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Just for reference, I finally got modbus to work on the sun-12k-sg02lp1-eu-am3 Use the "Meter_CON" port as shown below. Flip the blue dip switches next to the port to ON as in the image. Then restart the inverter. As for esphome config, for some reason this file did not seem to work for me: https://github.com/slipx06/Sunsynk-Home-Assistant-Dash/blob/main/ESPHome%20Configs/DEY12k-modbus.yaml This one though does seem to work for me: https://github.com/slipx06/Sunsynk-Home-Assistant-Dash/blob/main/ESPHome%20Configs/ESPHome-1P-Sunsynk-Deye.yaml

I did get it to work thanks. Without BMS looks like this: And with BMS looks like this:

How does one tell if the BMS comms still work? Nothing on the inverter indicates it. If I unplug BMS I see no difference on the inverter either (maybe it takes a bit of time?) I have a sun-12k-sg02lp1-eu-am3, I got the solar-assistant deye splitter, but my rs485 comms don't work. Trying to diagnose, it is a brand new inverter.

Not sure that is right. Take a look at the wording at https://solar-assistant.io/shop/products/deye_rj45_split It mentions that normal splitters keep the rs485 pins on the battery, which won't work. The solar-assistant splitter isolates the rs485 from the CAN pins completely. I received the solar-assistant splitter today, unfortunately my rs485 still did not work, I will try a few things tomorrow to try get it working. My inverter is a sun-12k-sg02lp1-eu-am3

@Sidewinder thanks so much. I'm going to get a splitter and try, I tried on the "Meter_CON" port with no luck. I see the splitter is out of stock, will wait and get one of these: https://solar-assistant.io/shop/products/deye_rj45_split Thanks for the info.

Did you come right? I'm about to attempt 485 cable to 12kw single phase deye, with esphome on esp32.

You're right. I'm getting confused seeing the circuit diagrams of basic series circuits with batteries, which are constant voltage, and assuming the zone circuit is constant voltage, which it isn't. I measured the voltage on some closed zones at 2V, and an open zone at 5V. I guess these zone circuits are then constant current circuits? Also the interface developer confirmed what you said in a nice and short summary here: https://community.konnected.io/t/how-does-the-konnected-alarm-panel-interface-module-work-electrically/39881/2 Thanks again for the info

Thanks for the info. Some questions: How would the interface pick up voltage changes? If the interface is parallel to sensor, and the sensor is opened to open circuit, voltage on the parallel interface would not change right? (voltage remains same over parallel circuits). Say the panel pushes 12v (I'm guessing), the interface is parallel so if the sensor is open or closed, interface still gets 12v? I wonder if there's a circuit diagram somewhere that can assist me to see how it's working. Maybe I'm not understanding your comment about pullup/pulldown or ADC. Why would the interface work over both NO and NC sensors? Thanks!

The install video for this product (https://konnected.io/products/konnected-alarm-panel-interface-module) shows to connect this interface zones in parallel to existing zones (https://youtu.be/fcY0dYuBQCo?t=760) I'm wondering how the interface does not interfere with the zone (I'm new to electronics). If the interface connects to existing zone + terminal, it effectively creates a parallel circuit with the sensor right? The panel monitors the zone resistance to decide if the zone is violated or tampered, but adding the interface in parallel surely must change the resistance being monitored? If that is the case and the interface potentiometer is what caters for this, then how would it work if a zone is violated? If the zone is violated on a NO (with its own resistor in parallel) sensor the interface would see a huge reduction in current I guess? Does the interface watch for current then? But if the zone is violated on a NC sensor (with its own resistor in series) the interface would see higher current? Since the interface is in parallel and the sensor side is open, how would the interface know the zone is violated? If the interface is monitoring voltage and not current, how would it know about zone violation given that parallel circuits have same voltage even if one branch (the sensor) is opened? I'm confused about how the interface works electrically while not interfering with the zone on the panel side. Any insights appreciated, thanks.

Thanks. I'm not foreseeing constant 200A, I just want to cater for the worst case. 140A/160A constant will be typical I think. I'm new to this and fearful to under-spec safety parts, hence the post. I don't yet have any smart monitoring to detect a prolonged high amp pull and switch off certain things as a result (I would love something like this, busy investigating home assistant for it)

Thanks. I'm going to see if my installer says 50mm2 cables will fit into both sides, and go with 50mm2.

Hi all, I'm trying to figure out if a deye 12kw inverter will be able to pull the max rated 200A of the dyness power brick safely in terms of wire size from battery to inverter. Page 14 of the power brick manual says to use 35mm. https://dyness.com/Public/Uploads/uploadfile/files/20250402/PowerbrickProUserManualENV0compressed.pdf If I look at the chart on this page with the wire sizing to AWG to A comparison, it shows 35mm at about 76A only. https://www.opengreenenergy.com/solar-dc-cable/ The other option I've seen mentioned online, is connecting 2 positive and 2 negative from battery to inverter to split the load. The inverter also suggests it has 2 battery connections per pole. Would 2 x 35mm for (+) and 2 x 25mm (-) work, does anyone currently use such a setup? Or should I opt for 50mm cables, and would those even fit into the battery and inverter? Thanks