toxicmolotof
2016-03-10 22:54:36
- #1
From 70 to 55 is also possible, but no funds must have been drawn yet.
But only if at least 6 months have passed since the first application. Everything else is at discretion.
Photovoltaic system, how to use experiences like heat pumps?
- Erstellt am 2016-03-09 22:27:18
But only if at least 6 months have passed since the first application. Everything else is at discretion.
toxicmolotof
2016-03-10 23:21:40
- #2
On the topic of KFW and limits:
We have no calculation without photovoltaics. There we relied on the statement of the energy consultant that we would definitely achieve KFW70. And then he made the photovoltaic system so large until we met the values for KFW55.
Our building: 47.9 kWh/(m²a) and 0.250 W/(m²K)
Reference: 88.7 kWh/(m²a) and 0.358 W/(m²K) (0.400 would also be allowable)
KFW 70: 62.1 kWh/(m²a) and 0.304 W/(m²K)
KFW 55: 48.8 kWh/(m²a) and 0.251 W/(m²K)
KFW 40: 35.5 kWh/(m²a) and 0.197 W/(m²K)
As you can clearly see, it was a very close call on KFW 55; for that the photovoltaics had to provide an annual production of 2,000 kWh with a self-consumption rate of 39.5 %, meaning just under 800 kWh. Since we now have an expected annual yield of over 4,000 kWh, the self-consumption rate of 800 kWh should be significantly exceeded.
We have no calculation without photovoltaics. There we relied on the statement of the energy consultant that we would definitely achieve KFW70. And then he made the photovoltaic system so large until we met the values for KFW55.
Our building: 47.9 kWh/(m²a) and 0.250 W/(m²K)
Reference: 88.7 kWh/(m²a) and 0.358 W/(m²K) (0.400 would also be allowable)
KFW 70: 62.1 kWh/(m²a) and 0.304 W/(m²K)
KFW 55: 48.8 kWh/(m²a) and 0.251 W/(m²K)
KFW 40: 35.5 kWh/(m²a) and 0.197 W/(m²K)
As you can clearly see, it was a very close call on KFW 55; for that the photovoltaics had to provide an annual production of 2,000 kWh with a self-consumption rate of 39.5 %, meaning just under 800 kWh. Since we now have an expected annual yield of over 4,000 kWh, the self-consumption rate of 800 kWh should be significantly exceeded.
toxicmolotof
2016-03-14 23:14:45
- #3
And this is what it looks like when you aim to optimize self-consumption around 9 o'clock. Unfortunately, by around 2 p.m., the last electrical appliances such as the washing machine, dryer, dishwasher, and vacuum cleaner were also turned off... 
f-pNo
2016-03-15 11:29:27
- #4
And this is what it looks like when you aim to optimize self-consumption around 9 o'clock. Unfortunately, by around 2 p.m., even the last power consumers like the washing machine, dryer, dishwasher, and vacuum cleaner were off...
Take a look at the respective consumption of your individual devices. As far as I remember (don't shoot me if I'm wrong), the dishwasher consumes less compared to the washing machine, and the highest consumption is from the dryer. So I would (when sunny) start with the dishwasher between 09:00 and 10:00, then add the washing machine between 10:00 and 11:00, and start the dryer from 12:00 (by then the dishwasher should be off the grid, and the washing machine might already be done, or must be done for the dryer to have something to work with). Vacuum cleaner or similar devices don't run forever and I would squeeze them in between.
This whole theory becomes irrelevant the moment the sun decides to take a nap during the day.
toxicmolotof
2016-03-15 12:48:24
- #5
That was just an experiment over the weekend... I can't actually use as much as is produced with sun without clouds on a lasting basis. The peak loads were, as always, the heat pump.
In that sense, what you have, you have. And everything else has to be sold or bought.
Basically just a great technical gadget.
In that sense, what you have, you have. And everything else has to be sold or bought.
Basically just a great technical gadget.
Bauexperte
2016-03-15 17:45:27
- #6
You don’t even notice it SCNR Rhineland greetingsBasically just a great technical gimmick.