Photovoltaic systems & storage systems *collective thread*

Good evening everyone,

as written above, this should not be covert advertising for any brand or anything else. I just wanted to bring up the general topic again and maybe bring some more clarity as well as news and information :)

Of course, there are certainly many studies that have been commissioned and promoted by manufacturers.

@ Bauexperte, with 7000 charge cycles that is really quite something calculated over 20 years. Are these lithium-ion batteries or regular ones?

Good evening,

Lithium ion batteries.

Rhenish greetings from the road
Construction expert

I wouldn't use lead-acid batteries anymore either, the lithium batteries aren't much more expensive. I calculated this back in early 2013, after subsidies the price per kWh was 40ct for Li-ion batteries, meanwhile prices have dropped significantly. The more self-consumption you achieve, the better – nowadays up to 80% of the electricity demand can be covered by the storage in a low-energy house with a heat pump.

I think during the course of the year, the kWh prices of battery storage and grid supply will converge, unless something unusual happens.

The question is whether it is still needed... People are building more and more energy-efficient houses, the technical devices are becoming more and more efficient and almost all can be programmed to operate at a time of day when (of course not daily) electricity is produced... Lighting is becoming more efficient, and so on and so forth... Is such a battery really needed for the average household?

But that is probably the same question as, do I need an expensive geothermal system for an efficient house, etc...

Everything can be made to look good on paper ;)

I don't know whether the safety regulations have been revised in the meantime, but lithium-ion batteries can potentially pose considerable dangers. Apparently, there are still no adequate regulations ([Elektrische Betriebraumverordnungen sind Ländersache]), and today anyone can apparently just put these things relatively unprotected in the basement. Just google hazard and lithium battery, there is more detailed information than I can provide here. Since I work for a logistics service provider, I still know what we had to do in order to be allowed to store electric bicycles with lithium-ion batteries. When stored and moved in larger quantities, these relatively small batteries already pose a significant danger and various safety precautions are required to handle them. The batteries are highly flammable, can leak if dropped or otherwise mechanically damaged, etc. However, for a photovoltaic system, completely different battery sizes are required. There should at least be fire protection requirements for the room where they are installed and corresponding warning signs for the fire brigade indicating that a hazard source is located there.

What I have read so far is that there really are no exact regulations yet. It is generally advised to secure the rooms according to the fire protection regulations. Often, battery cabinets are simply installed. However, it should rather be a frost-free room that can also be heated, etc.

Furthermore, it may also be the case that the fire insurance for the house increases. So far, this does not necessarily have to be reported to the insurance, right? But it would probably be better to do so.

@ Nathi,
that really sounds quite promising.

But as lllo77 already said, it is probably always a cost calculation at the moment :)