PLCguy

I guess it's the branded one as it has "Sunsynk" printed on it, but it also does have the red and green LED's. The same one posted earlier by @valienté with the picture. Below is the UI served from it.

 
I have also checked and it's only port 80 open on the unit, the web server is mongoose6.7 but don't know if there are any exploits to try and get root on the unit. cgi-scripts that can be executed on the unit are, and there are others:
http://<device-ip>/config?command=status
http://<device-ip>/config?command=devinfo
but the interesting one is this: 

 
just going to keep digging...
 

Bytes 0 - 10 -> payload header
Byte 2 = A1 when packet from server, = 01 when packet from wifi dongle
Bytes 9-10 -> Actual data byte count from byte 11
Byte 11-20 -> Inverter ID
Byte 37 -> Year
Byte 38 -> Month
Byte 39 -> Day
Byte 40 -> Hour
Byte 41 -> Minute
Byte 66-67 -> Daily battery charge totalizer (resets to zero @ 00:00) | kWh = raw value / 10
Byte 68-69 -> Daily battery discharge totalizer (resets to zero @ 00:00) | kWh = raw value / 10
Byte 74-75 -> Total battery discharge since beginning of time | kWh = raw value / 10
Byte 82-83 -> Total grid import since beginning of time | kWh = raw value / 10
Byte 84-85 -> Grid instantaneous frequency | Hz = raw value / 100
Byte 96-97 -> Load usage totalizer since beginning of time | kWh = raw value / 10
Byte 140-141 -> Battery capacity (Battery setup screen parameter) | Ah = raw value
Byte 182-183 -> V-grid-L1 | V = raw value / 10
Byte 186-187 -> Inverter AC output
Byte 190-191 -> Unidentified voltage
Byte 192-193 -> Unidentified voltage
Byte 212-213 -> Grid power (Instantaneous) | watt = raw value
Byte 216-217 -> Unidentified power
Byte 218-219 -> Unidentified power
Byte 220-221 -> Inverter power
Byte 228-229 -> Inverter load output | watt = raw value / 10
Byte 242-243 -> Battery watts (instantaneous)
Byte 244-245 -> Battery current (instantaneous)
Byte 246-247 -> Unidentified frequency
Byte 248-249 -> Unidentified frequency
Byte 280-281 -> Battery capacity (0 when grid present, capacity value when grid off)
Byte 282-283 -> Discharge limit
Byte 285 -> SOC (State of charge) | % = raw value
Byte 286-287 -> Battery voltage from BMS
Byte 288-289 -> Battery current from BMS
Byte 290-291 -> Real time battery temperature (range -99.9 degrees to +99.9 degrees scaled between 0x01 AND 0x7CF, where 0 degrees = 0x3E8
 
 

Hi all, don't know if this thread is still alive but here is what I have deciphered so far, in the 292 bytes payload of the dongle. If anyone else can maybe confirm that this corresponds to their inverter data as well, I have the SUNSYNK-5K-SG01LP1