Third extended heat wave within 6 weeks.
The previous one exceeded 40°C, and the buildings not yet had time to completely cool down from that one before the third wave hit.
I was considering putting up a tent in my garden myself, but as I own a ground floor flat, the indoor temperatures did, with the help of some additional cooling measures, thankfully not exceeded 27°C.
Doubt, with external shutters and solar balcony
Why?
The external shutters only help keeping the sun out during daytime.
Once the walls have heated up (which takes 3-4 days, as these are massive brick walls), you have a nice constant 30°C, day as night…
Apartment with external shutters can still overheat if situated in a strong urban heat island and heatwave endures for long time…
Yeah but it tells of a better efficiency
No, this type of external shutters is standard for German homes, so tells not much by itself.
As for the efficiency: Buildings here are mainly designed for colder weather, with the intent to keep the warmth inside and at a constant temperature (thick, massive walls and insulation on the outside). And at this, they are very efficient.
But during the recent, unusually long heat waves, once the heat managed to seep in (typically after 3-4 days), you are basically screwed, as you have no chance to lower the inside temperature without AC.
Temperature stays high even at night, trapped in the walls.
that solar is plug in balcony solar, meaning it probably doesn’t have a battery, so only works when the rest of the power grid is working. if they are in a power outage it isn’t providing power. that’s for safety reasons as they don’t want these balcony solar units to back feed into the larger power grid that would cause power companies from working on power lines
So, you as the owner get the cost, almost no money for the energy but also no off-the-grid security? Do i see a pattern?
It mainly covers your base consumption.
Profit you make is the savings you have because you have to purchase less electric energy from your provider.
Typically pay for themselves within 3-4years for such an installation on south facing balcony in my region.
The rest of the 20years of its lifetime is just free money after that.
I have a two panel installation, saving me ~120€ per year.