Integration of a Fronius Symo Gen 24 plus Inverter via Modbus TCP

enoch85 · October 28, 2023, 6:49pm

OK, so I took the easy route for now, just to have something to build upon. This is considered a “base” at least:

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Everything started to come togeheter when I added the “State Changed Node”. That changed everything and I could remove all my condition checks as it would only trigger when the state was changed which is 2 times per 24 hours. I’m still not pleased with that it writes to the Modbus device on every “Deploy” though. Is there any way to come around that? Also, would it be possible to change the NVRAM if it goes south?

I also got what I need in terms of time for the start and stop event. Here and here. So my idea is to start charging the home battery 1 hour before the car chargin starts, since it tends to start in the end of the allowed range. It’s not optimal since it could trigger a charge on “the wrong” hour, but I’ve never seen a peak in the middle of the night before.

As mentioned, I now have a base to stand on that at least works - and my goal is to tweak it further so that it checks for more conditions than just house load and if the car is charging. Another factor could be if the price differs more than 1 SEK from today’s and tomorrows price…

Anyway after about 3 hours sleep today I decided to just let it sit for while now to see how it behaves. I’ve added a check for the house total consumption to not blow any fuses, ideas of improvement here are welcome!

Somewhat prioritized tasks left:

Be smart about ChaState and put it back to NORMAL or HOLD when a certain % is reached, help is welcome! This should also consider the next day price, or the average price during a certain time frame to be able to decide if it’s worth DISCHARGE or not… I think this might help.
Do I actually use the correct sensor to check the house load? sensor.gen24_ac_meter_watts. I noticed a race-condition yesterday where it discharged from the battery and thus thought the power from grid only was 13W, and then put it into max force charge, which in turn stopped one of the cars from charging… I want a sensor for total consumed from battery, grid, and everything.
Implement the start and stop times as template sensors so that I can choose when to start and stop in Node RED.
Try to avoid writing to the NVRAM by adding even more checks before a write happens
Etc…

Well, almost. Sun comes up around 8:00-9:00 and sets at around 15:00 - and 90% of the days are cloudy. In the north of Sweden, the sun never rises during winter.

Thanks again! You made it so much easier for me down this path.

Current state:

#################################################################

Btw @heyyitsal, would you be able to send this Excel to me? It would be easier to keep track of all the numbers since we have different batteries:

enoch85 · October 28, 2023, 11:05pm

OK I admit, I couldn’t keep my hands off… It ended up in this:

(Updated at 02:07 AM)

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1H before car charging starts AND price/kWH are LESS than 50 öre (cent) AND battery level below 50% —> FORCE CHARGE 4500W
WHEN car START charging THEN check if house grid load is less than 5000W:
a) IF MORE THAN 5kW —> FORCE CHARGE 1500W (to disallow discharge)
b) IF LESS THAN 5kW —> FORCE CHARGE 4500W (to disallow discharge)
WHEN car STOP charging —> HOLD
DISCHARGE between 06:00 - 08:00 OR 17:00 - 19:00 AND price/kWH are:
a) MORE than 150 öre —> DISCHARGE 1000W
b) LESS than 150 öre —> HOLD
WHEN battery is more than 90% AND time is 08:00 -17:00 —> NORMAL

So basically:

Cars are allowed to charge between 19:00 and 05:00 (but only on the cheapest rate which usually occurs at between 00:00 and 04:00.
1H before the cars are scheluded to start charging, then add full power to the home battery on the condition that price is below a certain point
When car charging starts, then check the house power, and decide which charge mode based on that
When car charging stops, then always put the battery in HOLD, might add a factor for sunrise there as well now wen thinking about it…
Between the most expensive times during the day, discharge if the price /kWh is 100 öre (1 SEK) more than what we force charged with earlier (1H before that car started charging).

In amount of commands per 24 hours that could be something like:

Force charge starts 1 hour before the car starts charging, new command
Car starts charging, new command
Car stop charging, new command
Time is between the given times, 2 new commands in the morning, and 2 new commands in the evening (since the trigger for each hour (want to make this one comand, any ideas?)
When battery is above 90% between 08:00 - 17:00, new command

TOTAL: ~8 commands per 24 hours if all the commands are carried out. Is that too much?

Also, I haven’t figured out how to check BOTH cars… Right now everything depends on if one car needs charging or not.

EDIT:

OK, so I came up with a solution to lessen the writes to Modbus. Do you have something better in mind?

heyyitsal · October 29, 2023, 9:52am

Btw @heyyitsal, would you be able to send this Excel to me? It would be easier to keep track of all the numbers since we have different batteries:

Don’t we have BYD HVM 11.0?

You’ve significantly minimised the amount of commands sent! But without any documentation about what is “too much” - its hard to say. All you can do is not send a command if you don’t need to and it looks like you have definitely done that! I have my own implementation but still a work in progress.

Overall you’ve done a great job and if your commands work then the rest is up to you to play around and experiment

NodeRed is like Lego, so fun to figure out what each node can do and it’s so satisfying when you can get it working hahaha

enoch85 · October 29, 2023, 11:02am

Good to get some confirmation!

It ran now last night, and battery is currently at 82% HOLDING. Prices today are still low and now I’m waiting for the time span to occur for it to DISCHARGE.

I already have a few improvements in mind, but that would mean more writes to the NVRAM - like CHARGE everytime the battery is X and price is X, and do the same for DISCHARGE, and NORMAL.

One thing also, if sun would be shining now (it doesn’t), and the battery wasn’t min 90%, HOLDING the battery would mean I would export excessive energy instead of pushing to battery… Preferably I’d like for the battery to be CHARGED instead of HOLDING. I guess that would mean a setting of 3, and DISCHARGE to minus 100 and CHARGE to 0?

And yes, I also have the BYD 11.0 HVM.

Will be interesting to exchange ideas in the future. I’m curious about your switch @heyitsal… It seemed smart.

enoch85 · October 29, 2023, 8:29pm

Some updated battery modes:

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enoch85 · October 29, 2023, 9:04pm

The solutions for the cars became like this:

If they should start at the same time I’ve set an offset on either one or the other state, since it takes a few seconds for the Modbus to write and update.

I’ve also optimized the DISCHARGE a bit. Depending on the price, it now discharges at different power. The loading cost for CHARGING is always below 40 öre (cent), that means either 1 or 2 SEK profit / kwh.

EDIT:
Btw @steffanlm Just implemented your “Rate limit” before writing to Modbus, nice addition!

I’m a bit more cautious and decided to go with 1 message every 5 seconds. NVRAM wear…

heyyitsal · October 30, 2023, 5:44am

If you meant Discharge to -100% :

StorCTL_Mod = 3
Discharge = 55536
InWRte = 0

Then you would be force charging at 100%.

If you want
No Discharge - Only Charge with Excess Solar
Either:

StorCtl_MOD = 2
OutWRte = 0

Same thing can be done with this (but redundant in this case)

StorCtl_Mod = 3 (enables both OutWRte and InWRte registers)
OutWRte = 0
InWRte = 10000 (allow charging up to max rate)

The solutions for the cars became like this:

Wow you’ve done so much already! Keep it up!!

Will definitely post my battery/inverter control up soon - trying to efficientise it further… maybe it’s a never ending goal??

enoch85 · October 30, 2023, 9:10am

Haha, true dat!

I think this is just what I needed, thanks! Will set that as the normal throughout the day.

enoch85 · October 30, 2023, 2:44pm

This one is also very interesting, I can now extract the time of the day when the price is at it’s highest, and if that price is above a hard limit set, then go bananas on the export (discharge):

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Still experimenting, but after today’s run I’ve learned a few things:

HOLD is only good if you actually know a big peak is coming, it’s better to set StorCtl 3 and let it charge from sun.
Always try to diff at least 1 SEK (0.1 EUR) between charge and discharge. I sold pretty cheap today, and bought it expensive.
There’s always room for improvement. The hardest parts are the hard limit - where should it be set? It can differ from day to day. But I think I settled on selling from battery storage if the price differs more than 1 SEK for now.

enoch85 · October 31, 2023, 10:28am

OK, so I think this is close to the final result:

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puts the battery in normal operation.\nMeaningn that it will both charge and discharge to\nits set limits at 100%,\n"},{"id":"66d147c4d9a586f8","type":"function","z":"effce8e2e8a9f43c","g":"d93cd01b0135c571","name":"4500W CHARGE","func":"msg.StorCtl_Mod = \"2\"\n// 4500W (65536-4500)\nmsg.OutWRte = \"61036\"\n\nmsg.newstate = \"forcecharge4500w\"\n\nreturn msg","outputs":1,"timeout":"","noerr":0,"initialize":"","finalize":"","libs":[],"x":2150,"y":560,"wires":[["fad803646bcd93ee"]],"info":"Example 1: Only permit energy storage charging\nThis behavior can be achieved by limiting the maximum discharge capacity to 0%\n=> results in window [-3300 W, 0 W]\n- OutWRte = 0% (set discharge limit of WchaMax to 0%)\n- StorCtl_Mod = 2 (activates discharge limit, bit pattern: 10)\n- InWRte is not relevant in this case"},{"id":"5d370aec7b2aa1ce","type":"function","z":"effce8e2e8a9f43c","g":"7a2e734eead34d16","name":"HOLD","func":"msg.StorCtl_Mod = \"3\"\nmsg.OutWRte = \"0\"\nmsg.InWRte = 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Any suggestions of improvments?

heyyitsal · November 9, 2023, 12:20am

How does it go after 9 days?

I’m working through my solution - finding edge cases I should’ve thought about.

Max discharge of battery at 4.5kW - reduces solar panel production due to maximum AC output of the inverter. So have had to dynamically adjust battery output instead of forcing max discharge.

Wish I could start doing forecasting but still need to get the basics down first…

enoch85 · November 9, 2023, 4:05pm

My loong answer got lost due to read-only…

Basically yes - it works OK, but I’m starting to question if it’s worth it in the end when importing electricity from GRID is so expensive.

enoch85 · November 10, 2023, 12:16pm

OK, so now I want to change Fronius to Sunspec in my Energy dashboard, but I’m not sure which entities to use in my templates.

Does anyone have a clue?

heyyitsal · November 14, 2023, 4:50am

Hope you figure out an optimal charging strategy!!

Energy Dashboard:

From smart meter - Sunspec integration:
Smartmeter Energy Real Consumption:
_total_watt_hours_imported

Smatermeter Energy Real Produced:
_total_watt_hours_exported

Total Photovoltaics Energy:
You’ll need to make your own template sensor - you can use if you have 2 strings - 1 on each input:
kw10_mppt_module_0_lifetime_energy + kw10_mppt_module_1_lifetime_energy

  - name: "Power Photovoltaics 10kw"
    unique_id: "power_photovoltaics_10kw"
    unit_of_measurement: W
    device_class: power
    state: "{{ states('sensor.kw10_mppt_module_0_dc_power') | float(default=0) 
    + states('sensor.kw10_mppt_module_1_dc_power') | float(default=0)}}"

And then integration sensor:

- platform: integration
  source: sensor.total_power_photovoltaics
  name: "Total Photovoltaics Energy"
  unit_prefix: k
  method: left

And Total Battery Energy Charge/Discharge
Same thing - you’ll need your own integration sensor for that based on:

kw10_mppt_module_3_dc_power
kw10_mppt_module_2_dc_power

- platform: integration
  source: sensor.kw10_mppt_module_2_dc_power
  name: "Total Battery Energy Charged"
  unit_prefix: k
  method: left

- platform: integration
  source: sensor.kw10_mppt_module_3_dc_power
  name: "Total Battery Energy Discharged"
  unit_prefix: k
  method: left

Something like that…

enoch85 · November 19, 2023, 1:27am

Thanks!

For feed in effect (Fronius), I have this today:

{{ max(0, 0 - states('sensor.gen24_ac_meter_watts') | float) }}

And for ‘drawn effect’ (Fronius) I have this:

{{ max(0, states('sensor.gen24_ac_meter_watts') | float) }}

Is that wrong?

heyyitsal · November 23, 2023, 2:53am

Yeah looks good if you’re measuring import/export power! Just remember the Energy dashboard requires Energy sensors - like:
Ac_meter Total Watt-hours Exported
Ac_meter Total Watt-hours Imported

enoch85 · December 2, 2023, 10:07am

@heyyitsal It all works now as expected, and I have removed the Fronius app. Finally everything is local!

Also, I have now run my Node-RED for some weeks and are satisfied, a few more parameters are now set as well (only charge the home battery if my HVAC doesn’t need to work hard for example)

The whole scheme is to large to add here, but if someone’s interested, please ask.

MBolt · December 4, 2023, 6:58pm

Hi, thank you for the great examples!

My setup:

GEN24 10.0 plus
Tesla M3 battery (with BYD emulator) and capable of charge/discharge 10kW.

When I test it with my Gen24, I need to use start address 40358. With 40348 it doe snot work. How can that be?

If I do the following:

msg.StorCtl_Mod = "2"
// 4500W (65536-1500)
msg.OutWRte = "64036"

msg.newstate = "forcecharge1500w"

return msg

My inverter starts to charge with 6,2kW. I can not figure out why that is happening. Do you have an idea?

enoch85 · December 9, 2023, 12:07pm

This is how I do force discharge of 1500W

msg.StorCtl_Mod = "1"
// 65536 - 1500
msg.InWRte = "64036"

msg.newstate = "1500wdischarge"

return msg

And force 1500 charge:

msg.StorCtl_Mod = "2"
// 4500W (65536-1500)
msg.OutWRte = "64036"

msg.newstate = "forcecharge1500w"

return msg

I’m also on the Gen24 Plus 10 kw, so it should be the same. But it may be related to your battery…

Try with 6 kw:

msg.StorCtl_Mod = "1"
// 65536 - 6000
msg.InWRte = "59536"

msg.newstate = "6000wdischarge"

return msg

And force charge:

msg.StorCtl_Mod = "2"
// 65536 - 6000
msg.InWRte = "59536"

msg.newstate = "6000wcharge"

return msg

friskens · December 11, 2023, 1:54am

You’re using “Int + SF” instead of “floats” (or the reverse …) this is set in the inverter under Modbus settings and the addresses change depending on that. Might also be why your charge is set to 6.2kW since that address is close to others if you’ve selected the “wrong” typesetting for your Modbus. Might also be the defaults in the BYD emu that is messing with your charge settings.

6.22kW also matches the testbed for the emu and when I read about it on github i always felt they missed the point of one of the datapoints they got “6240W” reported from the battery, now this is just a theory but i do believe the Gen24 actually utilitizes this data for setting the charge and discharge speeds when communicating with the battery since I know when my HVS 5.1 drops below 5 degrees the charge and discharge gets derated from 4.6kW-ish to 1500W-ish or so before it starts to heat up to proper temperatures again.