Detect unused solar energy

[xjustbmw]

Hi there,

I just had a 27kW fronius inverter with 90x340W solar panels installed.

Since the payment to send energy back into the grid is very low in my country, I would like to make use of all the solar energy available through heatpumps and sanitary water heating, without ohmpilot.

Currently the system limits the output based on my usage, but I dont know how much more is available from the solar panels.

Is there any way to detect the extra available power from the fronius API in realtime ? I managed to connect to the API(V1) and it responds, but I dont know which value shows this available power information.

My smart meter is: Smart Meter TS 5kA-3
The inverter is : Fronius Eco 27.0-3-S

Thank you

[B-Man]

manually or automatically control something based on available power?
this is a good instantaneous view https://forums.whirlpool.net.au/thread/91jv4r83

or for android and maybe iphone, solar.web live or solar.web pro works ok but is slower and more delayed

Also the inverter has an option called load managment that can direct power elsewhere. Not sure how it works but of you have the meter configured it should be able to do it on excess power.

or another few options for either logging or viewing

Fronius PHP Ultimate

Hi Guys, i modified a version of fronius PHP to give every option available from the API’s and to be able to work with or without three phase and the smart meter, added all configurable options at the top Script located here https://github.com/B-Mqn/FroniusPHPUltimate i have little to no coding experience and 0 PHP experience but after some trial and error i got the thing running pretty good its probably a little messy and has a few errors but still does what needs to be done. if anyone can h…

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Fronius Push

As far as i can tell you cant get string control from the push or fronius php (that uses api) Its obviously possible as the fronius solar web can display it but we don’t have access to the data they retrieve it from. I did hear you can get it from the modbus but haven’t looked into it. If you want extended data and don’t have a smart meter you can use fronius.php on a pi or whatever is available. i have modified one called fronius ultimate php Fronius PHP Ultimate That lists out all options…

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Extending Fronius Push Service (LogData)

Looking to see if we can extend the ‘Fronius Push to PVOutput (LogData)’ service.This would enable easier reporting of multiple strings/arrays via PVOutput. It appears currently you can receive some extended data using (for example): /service/r2/froniuspost.jsp?sid=your_sid&key=your_key&v6=Voltage_AC_Phase_1 Can we include any of the below? Current_DC_String_1 Current_DC_String_2 Voltage_DC_String_1 Voltage_DC_String_2 Temperature_Powerstage Temperature_Channel_1 Temperature_Channel_2 …

[grannos]

Hi @xjustbmw

You can quite easily obtain realtime PAC figures using the Fronius API. My Fronius Symo relies upon version 1 of the API

You can check your API version with the following API call. [ Substitute the IP address of your inverter unless you’ve configured a HOST name for it ]

http://fronius/solar_api/GetAPIVersion.cgi

I get the following.

{
“APIVersion” : 1,
“BaseURL” : “/solar_api/v1/”,
“CompatibilityRange” : “1.6-3”
}

In Ver. 1 of the API

http://fronius/solar_api/v1/GetMeterRealtimeData.cgi?Scope=System

Will provide you with a wealth of information including the value PowerReal_P_Sum which will show you NETT power. If the value is NEGATIVE you are exporting electricity to the grid if it is POSITIVE you are IMPORTING electricity from the grid.

Depending on the sign and magnitude of this value you could control an external load. This would require a computer / Arduino / Raspberry Pi or some other form of microcontroller. You would essentially be mimicking the Fronius Ohmpilot.

Of course there are all sorts of safety issues once you start to switch mains voltage at the sorts of current that you are considering. You would also need to engineer into the software something that prevents your loads from being rapidly switched ON / OFF if the NETT power figure hovers around or crosses ZERO else you might damage something. E.G. If you switched in a 2000W load with only 1000W of surplus power the new NETT figure of 1000W [ IMPORT ] would / could trigger the shedding of the load a few moments later. This would be highly undesirable.

{
“Body” : {
“Data” : {
“0” : {
“Current_AC_Phase_1” : 5.601,
“Current_AC_Phase_2” : 6.1600000000000001,
“Current_AC_Phase_3” : 6.9379999999999997,
“Details” : {
“Manufacturer” : “Fronius”,
“Model” : “Smart Meter 63A”,
“Serial” : “1738XXXXX”
},
“Enable” : 1,
“EnergyReactive_VArAC_Sum_Consumed” : 27706220,
“EnergyReactive_VArAC_Sum_Produced” : 21653530,
“EnergyReal_WAC_Minus_Absolute” : 31500273,
“EnergyReal_WAC_Plus_Absolute” : 10928128,
“EnergyReal_WAC_Sum_Consumed” : 10928128,
“EnergyReal_WAC_Sum_Produced” : 31500273,
“Frequency_Phase_Average” : 50,
“Meter_Location_Current” : 0,
“PowerApparent_S_Phase_1” : 1350.9612,
“PowerApparent_S_Phase_2” : 1474.0880000000002,
“PowerApparent_S_Phase_3” : 1667.8951999999999,
“PowerApparent_S_Sum” : 4466.8999999999996,
“PowerFactor_Phase_1” : 0.98999999999999999,
“PowerFactor_Phase_2” : -0.98999999999999999,
“PowerFactor_Phase_3” : 1,
“PowerFactor_Sum” : 1,
“PowerReactive_Q_Phase_1” : 63.969999999999999,
“PowerReactive_Q_Phase_2” : -62.399999999999999,
“PowerReactive_Q_Phase_3” : -19.600000000000001,
“PowerReactive_Q_Sum” : -18.030000000000001,
“PowerReal_P_Phase_1” : -1340.78,
“PowerReal_P_Phase_2” : -1461.6600000000001,
“PowerReal_P_Phase_3” : -1664.46,
"PowerReal_P_Sum" : -4466.8999999999996,
“TimeStamp” : 1641178830,
“Visible” : 1,
“Voltage_AC_PhaseToPhase_12” : 416.10000000000002,
“Voltage_AC_PhaseToPhase_23” : 415.39999999999998,
“Voltage_AC_PhaseToPhase_31” : 417.10000000000002,
“Voltage_AC_Phase_1” : 241.19999999999999,
“Voltage_AC_Phase_2” : 239.30000000000001,
“Voltage_AC_Phase_3” : 240.40000000000001
}
}
},
“Head” : {
“RequestArguments” : {
“DeviceClass” : “Meter”,
“Scope” : “System”
},
“Status” : {
“Code” : 0,
“Reason” : “”,
“UserMessage” : “”
},
“Timestamp” : “2022-01-03T11:00:30+08:00”
}
}

Grannos.