Solar storage for photovoltaic system?

Photovoltaics are to be installed on our terraced house. The technician who looked at our roof says: The maximum system size that fits is 5 kWp. Question: Is a storage system then worthwhile? The technician says yes, but of course he also wants to sell it... I would appreciate an independent assessment. Thanks!

Photovoltaics are to be installed on our terraced house. The technician who looked at our roof says: A system with a maximum output of 5 kWp fits on it. Question: Is a storage system then worthwhile? The technician says yes, but of course he wants to sell it... I would appreciate an independent assessment. Thanks!

Economically only with subsidies. Are there any available for you? The advantage when you buy a storage system with photovoltaics is that you also get the tax back for the storage system when registering a business. If you retrofit a storage system later, this possibility does not exist. If you have little space, make sure the modules are as efficient as possible and that you don’t fill your roof with 340-watt modules.

It will probably not be worth it. A storage system of around 2-3 kWh should be reasonably sized, but such small storage units are a) rare, and b) significantly more expensive per kWh than larger ones. I would advise against it.

maybe you just show your roof first (photos with approximate dimensions, roof pitches, orientation (north / south or similar) Then some people here can probably say more about it. Presumably, the system can only be as small as necessary to comply with boundary distances (fire protection)? Then alternatively ask about glass/glass modules.

I myself unfortunately only have a 6.5KWp system with a 3.9KWh battery (however, heavily subsidized as KfW40+, VAT refund, etc.)

My experience so far: In summer, the 4KWh battery almost lasts through the night (from 8:00 p.m. to 8:00 a.m.), and also helps avoid the 70% curtailment during the day (my system has 100% south orientation at 45° pitch), in winter it is not really helpful due to lack of charge cycles and is sometimes "switched off". Roughly calculated, in my opinion the battery is worthwhile at costs of up to 500-700€ per KWh installed capacity. The more expensive the electricity, the sooner.

Nope. Batteries are simply still too expensive (especially currently) to make economic sense. The larger the system, the more likely it is that you will benefit from your storage in winter (when you need it most). But we’re talking about systems over 10 kWp here.

I would first invest the (financial) power into a clean planning and clarify whether really no more than 5kWp fit on the roof. That is better than nothing, but for our prospective needs with heat pump and electric car, rather very small.

What is the roof pitch? Which cardinal directions do the roofs face? Is there a garage, carport, garden shed?