I'm working on programming a microcontroller(Arduino likely) to poll an EG4 3000EHV inverter for the battery state and PV input. When the battery is above something like 95% and the PV input is above something like 2000W(of a 4360W array) it will then turn on a SSR that powers the 1500w water heater up. I'm also thinking I might poll for inverter load as well. So if the inverter has say more than 500watts on top of the 1500watt water heater, the water heater will turn off to free up inverter capacity. There will also be a 3 way override switch off-auto-on. So when we want to run larger loads we can force it off or if we need hot water at night we can force it on.
Haven't made much progress yet, been trying to find some information on the serial port protocol. I may have to do some serial port captures of the communication between the wifi dongle thing that comes with the inverter and reverse engineer the protocol from there. I've done that before for other things.
Once the serial protocol is figured out the rest of the code is pretty simple and wiring it up is fairly straight forward. I will share the source code and a wiring diagram. Parts wise is will all be from aliexpress: Arduino clone, RS232 level converter, 3 pos switch, SSR. I might even design up a little 3d printed box to put it all in.
I'm not sure if Growwatt uses the same protocols. Are they make by Voltronic like the EG4?
Haven't made much progress yet, been trying to find some information on the serial port protocol. I may have to do some serial port captures of the communication between the wifi dongle thing that comes with the inverter and reverse engineer the protocol from there. I've done that before for other things.
Once the serial protocol is figured out the rest of the code is pretty simple and wiring it up is fairly straight forward. I will share the source code and a wiring diagram. Parts wise is will all be from aliexpress: Arduino clone, RS232 level converter, 3 pos switch, SSR. I might even design up a little 3d printed box to put it all in.
I'm not sure if Growwatt uses the same protocols. Are they make by Voltronic like the EG4?