Fronius API Question | Symo

Questions
#1

Hi,

I am attempting to assist another PVO Forum member in extracting and logging A.C. Voltage data from his Fronius [ Symo ] inverter. He does NOT have a Fronius Smart Meter.

The common Fronius API call http://fronius/solar_api/v1/GetInverterRealtimeData.cgi?Scope=Device&DeviceId=1&DataCollection=CommonInverterData does return a value for UAC ( Voltage ) but only while the inverter is actually inverting and not once it goes to sleep. He however requires 24 hour voltage monitoring and logging.

Does anyone have experience in extracting A.C. Voltage from a Fronius inverter WITHOUT an attached Smart Meter?

The reason for logging the data is to capture the rather larger swings in grid voltage at his premises.

TIA

#2

Does the other user use Home Assistant?

If so they could use that and one of the Shelly devices or something similar to get the grid voltage.

#3

Hi @ron-ski. No he doesn’t.

We have decided to go down the Shelly line. We don’t need power so it just needs to be connected - plugged in to read voltage. I see that there is a PHP library for the Shelly devices so once I have my hands on it I will do some testing.

Thanks,
Grannos.

#4

I am using HA to build a control system for a Goodwe ET inverter but its a work in progress. However along the way I have used Zigbee smart plugs and HA to log voltage and power without any problems, I found it quite straightforward and inexpensive.

#5

Hi @GregOh,

I got my hands on a Shelly EM Wi-Fi Energy Meter today. Extracting the AC voltage from it turns out to be dead simple. No PHP library required beyond the default PHP stuff.

Thanks for the info though.

Grannos.