Custom Integration: Sonnenbatterie

[rcruikshank (Robert Cruikshank)]

This is how I manage charging and discharging and switching loads on and off. I’m using the EMHASS add-on. This takes a feed of electricity price and FiT forecast (if you have these forecasts available), solar forecast from the likes of solcast.com and some historical data like last X days of power consumption and it produces a plan for the next 24 hours.

I then use the sensors returned by EMHASS to manage the battery and any loads in the house I want the system to manage (car charging, pool pump, hot waster etc.).

Example of a 24hr plan:

This plan has the schedue for charging and discharging the battery and at what wattage. The green below the line is a forecast sensor with charge schedule and wattage and above the line is discharge time and wattage:

You can see this charge and discharge lines up with a forecast of Feed-in Tariff and price from my electricity company (which happens to be a variable wholesale FiT and price). Its instructing the battery to charge in the morning between about 10:30 and 14:00 when the price is low and the sun is shining. Discharge is after 16:00 when the FiT is high.

FiT:

Pirce (which is of cause higher than the FiT):

This plan changes constantly (I run the calcualtion every minute) so the graph has change below. This is the solar forecast from solcast. Which also influences the charge/discharge and load schedules:

Pool pump load (deferrable load that is contoled by EMHASS):

House load. What the system forecasts we will use in the house over the next 24hrs.

This system only levers the sensors into home assistant. It doesn’t contol the battery or pool pump directly. You have to build the interface yourself.

I’ve done this in node-red:

This setup does three things:

1. Takes the charge/discharge sensor from EMHASS and sends http POST and PUT to the sonnen battery and reports back any errors from the battery to my phone.
2. Takes the deferrable load sensors from EMHASS and turns the pool pump on and off (only using one deferrable load at the moment)
3. Backages up the forecast data (FiT and price) from my electricity company and the solar forecast from solcast and builds an array of all that data and POSTs that into EMAHSS every minute.

It also makes available mannual contols over the batter via switch nodes. This is then displayed on a dashboard. Example below:

[Patraff (Patrick Raftery)]

Rob,
your setup looks pretty schmick. I want to delve into something like this but I need to work out how to contend with my house loads. I recently installed a sauna that sucks up about 6-8kW each hour. Obviously I can’t run this during the day as no-one is here to use it. We sauna after work hours. I tried to do a bit of preheat during the day to utilise more of my solar but winter is probably not the best time to do this.
I reckon I’m gonna need another two Sonnen batteries now to cover this along with all normal appliances.
Pat

[Jeza]

This is awsome and what im trying to do with my local wholesaler rates in Australia.

The only thing I’m trying to find out is how you got the charge and discharge to work as the standard hacs download doesn’t have it. It’s purely sensors.

I’ve got the sonnen 8.1 and I want to control it exact same way.

[Patraff (Patrick Raftery)]

I seem tio remember Rob or someone else mentioning that if you go to the IP address of your battery and login you will get access to the commands required. I have logged in and confirmed that I can do that - I need to switch the battery from automatic to manual and then set the disharge rate and then press discharge. A lot of commands to get right. I haven’t gone as far as trying to get this into emhass and automated but I guess with time… it’s project 234 at the moment.
Pat

[rcruikshank (Robert Cruikshank)]

I have an EV which also sucks up the juice. I was planning to include it as a deferrable load in EMHASS but so far I’ve left it out of its control. I just pick the best window to charge.

With amber electric (my electricity supplier) I get a forecast of price and FiT so I try to pick the best period to charge.

FiT can fluctuate from -10c to like $17. But I usually get a curve like this:

You can see a spike of $6/kWh yesterday and you want the system to be discharging at that point but to charge an EV I just set it to charge when the price is very low like 13c/kWh in the middle of the day or at 3am.

[rcruikshank (Robert Cruikshank)]

ok I don’t know about the sonnen 8.1 (mine is an eco 9.43) but if its the same then you can control it via REST API.

If your battery is like mine you sould be able to log into it and and select software-integration from the menu. There you will be able to set the API token and all the REST API calls available.

Then you can set up node-red to make these calls when you want.
This is my flow for the control switches and interface to EMHASS via sensor.p_batt_forecast

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[rcruikshank (Robert Cruikshank)]

These are other component flows.

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HACS","info":"","x":568.25390625,"y":1411.01171875,"wires":[]},{"id":"afc27684.cf6ed8","type":"server","name":"Home Assistant","version":5,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true,"cacheJson":true,"heartbeat":false,"heartbeatInterval":30,"areaSelector":"friendlyName","deviceSelector":"friendlyName","entitySelector":"friendlyName","statusSeparator":"at: ","statusYear":"hidden","statusMonth":"short","statusDay":"numeric","statusHourCycle":"h23","statusTimeFormat":"h:m","enableGlobalContextStore":true}]

I use oziee ha-solcast-solar HACS to retrieve my solar PV forecast. One of the flows above calls this HACS 5 times a day to update the solar data. You only get 10 API calls a day to solcast if you’re new to them.

[jezhall (Jez)]

So ive got all the Integrations except EMHASS as i cant find it and no clue how to put this in. But im not worried about this. I wanted to implement the Red node correct, Did you have to use a webhook to create the initial call for charge/discharge?

I have started my flow but looking at yours it doesnt have a webhook start?

[rcruikshank (Robert Cruikshank)]

No, not using webhooks just REST API.

The way it works is:
The node on the left named “p_batt_forecast level” is the sensor published by EMHASS with what the battery should be doing, charge, discharge or standby. The sensor contains a number between the max input to the battery to the max output of the battery. In my case -3300w to 3300w (negative meaning charge and pos meaing discharge and 0 meaning standby).

When p_batt_forecast changes the blue “events state” node send the desired battery state to the switch node which switches it between these three states and onto the appropriate sequence of REST API calls to achieve the desired state.

So. for example, less than zero (charge) causes three API calls

1. first put the battery into 0% backup buffer (the top one)
2. 1 second later put the battery into manual mode
3. 2 seconds later charge at the wattage number passed through (see below)
   
   

So 3 above is passing the charge wattage (which is a negative number) through to the battery.

The charge setup node is a function node with the above code in it. This code sets up a java object with the desired info to pass to the battery. line 2 in the code is turning the negative number from EMHASS into a positive number (the watts to charge the battery at).
I’ve blacked out my auth token as that gives access to my battery. The IP address will have to be changed to your IP address. The java object with all the info for the POST call is then passed to a http request node witch is the node that actually contacts the battery with the API call application info.

Of cause if you don’t want to implement EMHASS yet but just what the buttons:

So you can manually control the bat then the blue switch nodes are what you want. buttons above are linked to the blue switch nodes on the left below. They simply call the sequence of REST API calls to carry out each action. The blue “call service” nodes on the right simply turn the switch off (turning the switch off removes the yellow highlight you can see above on the “EMHASS control” button, doesn’t do anything else).

EMHASS is an add-on found in github GitHub - davidusb-geek/emhass: emhass: Energy Management for Home Assistant, is a Python module designed to optimize your home energy interfacing with Home Assistant..

[jezhall (Jez)]

I think you missing the point.

My standard configuration after linking my Sonnen to home assist does not have any config changing. i have no option to configure a charge or discharge. No existance of this. Ive tried everything. im now currently attempting to use node red to webhook the api web address from the software intergration and its not letting me send a “post” request to the api service to change the status of the battery.

All my entitis when i uploaded the sonnen hacs intergration provided is status readings only.

[rcruikshank (Robert Cruikshank)]

No thats whats in the node-red flow I posed above. weltmeyer HACS doesn’t implement any controls over a battery, only reads the various paramaters into sensors. Which BTW you can do yourseld using REST API GET commands.

Custom Integration: Sonnenbatterie

These are other component flows. [{"id":"f49b840467d14aca","type":"inject","z":"65840aa926d9c567","name":"trigger","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":310,"y":900,"wires":[["4f20c85e38e98c5e"]]},{"id":"4f20c85e38e98c5e","type":"function","z":"65840aa926d9c567","name":"Retrieve mode","func":"msg.headers = {}\nmsg.headers['Auth-Token'] = 'YOUR SONNEN TOKEN'\nmsg.headers [\"Content…

[jezhall (Jez)]

Im gonna be honest. I have no idea what any of that is, or how to put that into red node

[rcruikshank (Robert Cruikshank)]

The flows in node-red can be exported and imported. What’s pasted in the responce above is a couple of flows that implements control over a battery via API (and interface a battry with EMHASS). You can copy the text and past it into your node-red by pressing ctrl-i or selecting ‘import’ from the hamburger menu in top right.

But you’ll have to modify the imported flow to work in your envirnment as it will reference my environment. So it takes a bit of getting used to.

[rcruikshank (Robert Cruikshank)]

Node-RED Tips - Importing, Exporting, and Grouping Flows • FlowForge

[jezhall (Jez)]

HAHA, your the best!! ok now the thing im stuck on and i keep getting autharisation code 401

ive put this in to the url and i cant get past it. and im sure its wrong as ive tried all of them

http://192.168.0.173:80/api/v2/latestdata?api_key=(mykey)

[rcruikshank (Robert Cruikshank)]

You will have to change any home assistant nodes to connect to your instance of home assistant.

If you open a node and it reference a server called “home assistant” you will have to select the correct one as you will have two configured now that you’ve imported a flow from me. You can delete the incorrectly configured server late.

[rcruikshank (Robert Cruikshank)]

Be aware it will take a bit of work and understanding to get it to work in a new envirnment

[jezhall (Jez)]

You have been the biggest help, Ive read everything and i think i understand it.

I made my home assist crash so i think ill attack it again another time,

But a little bit of feed back is your a massive help!! cheers

[rcruikshank (Robert Cruikshank)]

No problem. Good luck getting it to work. Happy to help.

[Patraff (Patrick Raftery)]

Rob
just folowed your explanation thread in the last ten posts. Have you considered compiling this as a user guide with the assistance of David and Mark? There is just so much knowledge sitting here between yourself, David and Mark. Would be easier to see it in a one post read.
Pat