ᐅ Photovoltaic Systems for Self-Consumption

Hello everyone

I am currently considering installing a small solar system on the shed. The roof faces south with only a slight angle, about 95 degrees towards south.

I just want a small system to cover my electricity needs during the day. Unlike many others, we have a certain baseline load during the daytime. My partner works from home and always has two monitors and her computer running. In addition, of course, there are the usual electrical devices like lights, refrigerator, and so on.
Does it make sense to buy a 1000 watt-hour system in this situation? Or rather less? What do you think in general?

In general, small systems are not worth it at all. To ever recover the investment, you need to aim for a certain minimum size. It usually starts at 4 kWp, with 7 kWp being a common target (above this, a smart meter may be required) or 10 kWp (above this, a renewable energy surcharge applies to self-consumption).
Otherwise, the basic costs of the system—such as the inverter, wiring, etc.—significantly exceed the cost of the generator itself or become disproportionate in comparison.

So, I mean a complete package that is sold for about 1100 to 1200 euros on eBay.
They are supposed to deliver 1000 watts.

I do believe these systems generally work. However, a few questions keep coming up:

-The inverters are single-phase and feed into a standard outlet, but the electricity meter is three-phase. How is that supposed to work effectively? Loads connected to the other phases—meaning two-thirds of them—would not be able to draw power. Or can they? I'm not an electrician.
-What is the quality of the output voltage?
-Is it really cost-effective, especially when considering the effort for running cables, etc.? I don’t think so!

You can also purchase 4,000 kWh for the system.

nelly190 schrieb:
1000 Watt/h

Are you really an electronics technician?

Yes, I am an electronics technician. Unfortunately, more in industrial systems. I mean, I can connect it, but I have no knowledge of the subject at all. It always depends on the details here. As they say, the devil is in the details.

Knallkörper schrieb:
Consumers connected to the other phases, that is two-thirds, cannot draw power. Or can they? I am not an electrician.

Since the three-phase meter balances the load across all three phases, any energy fed into one phase also benefits the other phases mathematically, as long as the energy fed in is not fully "consumed" on the feeding phase.