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Energy taken from grid even when the home battery is almost full.


tsarbiker

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Hi,

 

I have a battery related question.

I have the following 2 scenarios:

1. 12kw PV system with 12kw Inverter, BYD HVM22.1 battery connected to a second 10kw inverter. 

image.thumb.png.1695cdb8fe49edb74adbc4e12a181a18.png

This gives you the following overview:

image.thumb.png.73c1691d75b533c49f809bea9738d190.png

And if I take a specific day:

image.thumb.png.dac388118ffcee825c1f604d00d53362.png

We can see that around 8 the electric car start charging and takes energy from the home battery to do so. In the evening the car is charged again but this time it takes energy from the grid even though the home battery is almost full.

Now setup 2 ->

2. 12kw PV system with 12kw Inverter, BYD HVM 11.0 battery connected to a second 10kw inverter + BYD HVM 11.0 battery connected to a third 10kw inverter.

image.thumb.png.481d4d283c7d330a813b4ac2944a9011.png

This gives you the following overview:

image.thumb.png.9b25cc5104ac331b2f31bc8c1a45a0e3.png

And if I take the same specific day:

image.thumb.png.c8f72a31d61aabcfb92c39729c5a91cb.png

You can see that at 8 and in the evening the car battery is charged with energy from the home battery. 

The overall efficiency of the system is better when there are 2 smaller batteries with an inverter for each. I do not understand why...

The total battery size is the same in both scenario.

Is this a bug? Is there something fundamental I do not understand? what is going on? :D

 

Let me know if you need more info.

 

Thanks!

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Hello tsarbiker

Thank you for your request.

On 1/29/2024 at 9:34 AM, tsarbiker said:

Let me know if you need more info.

Could you be so kind and send me both .pvprj files so can have a look into them? You could send them via private message here in the forum.

Thank you in advance and kind regards
Frederik

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