How can I reduce the energy collected by solar panels?

[hardy bane]

Hi everyone, I want to ask a question to help an old man I know. This man installed a solar panel system on his house. This system produces 2kV energy but 1kV energy is enough for the house. Since the excess 1kV energy goes to energy companies, he has to pay taxes and the man loses. Is there a way to ensure that the panels only produce enough energy for the house? Or is there a way to prevent the collected energy from going to energy companies? The guys who installed the panels created the system with home assistant. Unfortunately, I don't know anything about solar panels.

[gusty knoll]

In theory you can simply define a max output of the inverter

This may not be with out downsides depending on the model

Alternatively remove 1kw of panels or change your energy company

[deep citrus]

many inverters have a zero-export mode. If you download the inverter's app, it should be in there (if it suppors it)

[plain pecan]

I hope you mean kW or kWh 😄 2kV(olt) is pretty high inside a house,e ven for PV.

But what inverter? If it has an option to control the max output via HA you can steer that based on what the grid meter sees. Some inverters also have it as stand alone option but that usually requires extra hardware.

[noble marlin]

Is getting a battery to store the extra energy possible?

[hardy bane]

@gusty knoll @deep citrus @plain pecan
he using "shelly pro 3em". Do you know anything about this inventor. Because i really don't know about this topic. first time i heard what is inventor.

[hardy bane]

@noble marlin I think, in this way, after the battery capacity is full, the same problem will occur again.

[gusty knoll]

The Shelly is a measurement device not an inverter, all it does it report how much electricity is going in and out of the house

An inverter basically is the device that turns the DC coming from PV panels into frequency matched AC so it can be fed back into the regular energy network of your home

[noble marlin]

Have you read the manual on your inverter to see if it can be setup to not export power to the grid?

easiest way is to disconnect panels like was already said

[noble marlin]

I just picked up the shelly pro 3em to monitor my grid usage ... havent installed it yet tho

[gusty knoll]

That would be a bit of a waste as you aren't just reducing peak loads with that.

Similar to how reducing the output power can modify the production curve as opposed to simply capping it. This depends a lot of the inverters capabilities to do the switching

Active zero export mode as Stefan suggested would be optimal but it involves an active support for it by the inverter. The diy approach to this is terrible

[hardy bane]

Yes, you are right. I speak Deutsch to him and my Deutsch is not good. I translated it wrong.

[plain pecan]

It's not a 'inventor' but a inverter. It's the main component of a PV isntall that makes AC voltage suitable for the grid from the DC from the panels. Without controlling that thing there is no real way to control the PV

[hardy bane]

Hims inventer is Deye sun2000g3-eu-230

[gusty knoll]

That's not a great inverter ;D but great because it should simply be wifi controllable via their app

It should also have support for the zero export mode if my Google search is right

[hardy bane]

I know brother. Just english and deutsch not my native language and sometimes i do wrongs. I meant inverter.

[gusty knoll]

For the specifics you probably just browse through the app or have a look at the manual of that inverter

[hardy bane]

So nice! So we have nothing to do with home assistant? Should we just download the inventer's mobile application and activate zero export mode?

[gusty knoll]

Yes homeassistant shouldn't be involved with this

Either set the output limit to something more within range of your consumption or check for a zero export mode option

I dont trust Google but if they have it they go into detail in their documentation about how to set that up. Shouldn't be too difficult if the Shelly is supported