Roof covering and solar technician selection - Decision?

at least not simultaneously with the south modules...

My brother recently installed a nearly 10KWp north/south system on the carport
(for about €800 net per KWp with DIY).
I regularly get the results from this unsolicited o_O

With the inverter, you probably have to swallow toads (make compromises) because the market is empty.
Be glad when something is available and happy to make your own electricity. The perfect system
is probably not obtainable at the moment.

Understood, thanks! :-)

What I’m not quite clear about, however, is the relationship between kVA and kWp.. the inverter provides a maximum of 10 kVA at its output. Does that mean that only a maximum of 10 kWp can be fed in or directed into the house simultaneously?

For understanding, the question again: is it so that more than 15 kWp ever arrive at the inverter at all? If the south is producing at full capacity (so about 10 kWp), then the 7 kWp in the north will most likely not reach the 5 kWp, right, or am I wrong?

I consider that not excluded. Otherwise, I wouldn’t even cover the north. ;-) My 12 kWp south system, for example, sometimes delivers 13 kW.

What I’m not quite clear about, however, is the connection between kVA and kWp.. the inverter provides max. 10 kVA at its output. Does that mean that only max. 10 kWp can be fed in or supplied to the house at the same time?

Correct, it can generate a maximum of 10 kW on the AC side. That really causes a lot of loss in summer. At the moment, everyone is celebrating the abolition of the 70% rule and your solar installer wants to install 58%... Maybe he could still push something into a storage system, but that’s not enough.

Oh dear. Then that is really either ignorance of the solar technician or deliberate "rip-off"...

Yeah, sure. Wasting 8000-10000 kWh (pointless) and then being afraid (wondering). Keyword "power outage". :rolleyes:

Why pointless? My house simply consumes around 4000 kWh for a household with 2 people working from home and another 4000 for the air-water heat pump ….. since I found the first figure very high for 2 people, I had it discussed in this forum and others also came up with these values …. We have a ventilation system, a robotic lawn mower, 2 electric garage doors and an infrared cabin, etc. etc., it adds up …. Also, the new 65-inch TV is A++ rated but honestly, it does consume quite a bit … So what exactly do you mean by pointless?

And our electric car isn’t even included in that …

Hello again everyone,

so, since I no longer feel good about the first solar installer with his strange 10 kW inverter, I am now leaning more towards solar installer 2. I just spoke with him on the phone and although he doesn’t yet have references on the website, he has already installed several systems (he only got his master craftsman certificate last year) and I also know two others from the construction area who recommend him.

And he is really very cheap. Here are the technical details again:

- 20.9 kWp
- 51 x JinkoSolar solar module Tiger NE HC N-Type sw JKM410N-54HL4-B
- 2 x SMA inverter STP10.0-3SE-40
- 1 x SMA Sunny Home Manager HM-20
- I will leave out the other materials, but all installation, planning and commissioning services are also included here
- Costs: €25,570 net, thus €1,223

Just want to make sure that everything is okay or if there is some “problem” hidden that I might not see with my dangerous half-knowledge ^^ The 2 inverters should fit, the modules too. Otherwise, anything I should pay attention to?

Many thanks in advance!

Why pointless? My house now consumes about 4000 kWh household with home office for 2 people and another 4000 for the air-to-water heat pump... Since I found the first value very high for 2, I had it discussed extensively in this forum and others also arrived at these values... We have a ventilation system, robotic lawn mower, 2 electric garage doors, and an infrared cabin etc. etc. it adds up... Also, the new 65-inch TV is A++ but to be honest, it also consumes quite a bit... So what exactly do you mean by pointless? And our electric car isn’t even included in that...

4000 kWh for 2 “noses” is definitely (too) much. And no, the 100 kWh for the 65-inch, 5 kWh for the doors, or 25-50 kWh for the mower are not the main drivers here. Ventilation system depends on model, operating hours, and level. It can be 100 or even 500 kWh. Infrared cabin is of course user-dependent.