Connecting the inverter to the network / selecting the cable type.

Hello.
I almost started my PV installation but I have some concerns about the cable connecting the inverter with the meter. Currently, the cable is 2.5mm.

The instruction recommends 10 AWG which translates into a 5.3 mm2 cable round it to 6mm2.

I have to route two wires. From the meter to the inverter and from the inverter to power the house. connection also at the place of the meter.

I wanted to give 5x6mm2 one wire. Two wires from the meter and two to power the house. I'm afraid of overheating the cable and hence greater failure rate.

So I put on two separate wires. One from the meter to the inverter and the other from the inverter to power the house and I have the choice:

YDYp 3x6mm2 450 / 750V cable
or
YLY cable 3x6mm2 0.6 / 1kV
I will add that sometimes I download from the network about 4.5-5.5kW 2.5kW 2kW kettle and the rest of the house 1kW.
The wire speaks because it is cheaper and easier to lay. The cable is stable. In this case, I focus only on the experience of colleagues.

Give 3x6mm2 450 / 750V for sure enough.

I am just afraid that it will not overheat because I forgot to add that the distance between the inverter and the meter is 20 meters.

What power allocation do you have and what inverter power?

Single-phase installation and power allocation from ZE is 6kW. 4.5kW inverter.

All you need is a cable with such power.

Szczurek.1891 wrote:

I have to route two wires. From the meter to the inverter and from the inverter to power the house.

You have a total of 40mb and the voltage drop will be around 2% and it is 4.6V, admittedly such a drop is permissible, but to reduce losses I would use a cross-section of 10 because who knows, maybe you will add panels.

Let's not exaggerate 10mm2 is an exaggeration over a distance of 20m, why cost it.

Szczurek.1891 wrote:

Single-phase installation and power allocation from ZE is 6kW

At 40mb and 10mm2 the voltage drop will be 1.6% or 3.68 V
at 6mm2 the voltage drop will be 2.6% or 5.98 V

Tech132 wrote:

Let's not exaggerate 10mm2 is an exaggeration over a distance of 20m, why cost it.

We do not know, for example, the rigidity of the network.

In fact, the distance to small does not belong. Of course, I'm still trying to break it off. Giving a 6mm2 wire spectrum wire that it will be more convenient to lay than 10mm2 the more that I have to give two. There is also a visual difference. 10mm2 is already a big diameter.

I have 4 mm? phase and Pv power for 1 phase 3 kw is enough and 4.5 kW to the meter will calmly go 30 m and nothing is heating, convert to 5 A 1 mm?. If you give 6 mm? it will be with a higher and thicker don't waste money.

Thank you for clarification and help. I preferred to consult with colleagues more familiar with the topic than to test myself. It is also not an art to advise on minimum or maximum parameters and cost cutting. Or in the worst case, drown the money and in a month do everything again. Thanks again to everyone for their comments.