ᐅ Do photovoltaic systems and heat pumps share similar performance characteristics or operational experiences?
Created on: 9 Mar 2016 22:27
T
toxicmolotof
Hello dear forum members,
Since Monday afternoon, my photovoltaic system has been up and running, and I have to say... I can’t stop smiling.
Here are the details:
Today’s performance:
The gray line represents household consumption, the blue and red areas show production, where the blue part was self-consumed and the red part was sold.
You can clearly see the washing machine running in the morning, the regular starts of the heat pump, midday consumption, and even the not-so-optimally started dishwasher after 6 p.m.
For a (very good) day in March, I’m more than satisfied. The only thing is that the heat pump in the early morning isn’t yet running as efficiently as I’d like. But I guess only a battery would help with that, and that still seems uneconomical to me.
Since Monday afternoon, my photovoltaic system has been up and running, and I have to say... I can’t stop smiling.
Here are the details:
- 5.4 kWp (18 modules at 300 W each)
- Peak power limitation 70% soft
- Flat roof, mounting angle 10°
- Orientation southwest, about 45° off south
- Feed-in to household electricity including heat pump
- Surplus energy sale
- no battery storage
Today’s performance:
The gray line represents household consumption, the blue and red areas show production, where the blue part was self-consumed and the red part was sold.
You can clearly see the washing machine running in the morning, the regular starts of the heat pump, midday consumption, and even the not-so-optimally started dishwasher after 6 p.m.
For a (very good) day in March, I’m more than satisfied. The only thing is that the heat pump in the early morning isn’t yet running as efficiently as I’d like. But I guess only a battery would help with that, and that still seems uneconomical to me.
I am looking for a calculation/Excel spreadsheet to assess the cost-effectiveness of a photovoltaic system combined with a heat pump. Do you create these yourselves, or do you consult a professional/provider directly? I have already tried the spreadsheets on Test.de and Umweltinstitut.org. Unfortunately, these do not include a monthly distribution or calculation to determine which combination is most efficient for calculating the collector area based on self-consumption with a heat pump.
T
toxicmolotof18 Sep 2016 22:54This is not easy to calculate either. Besides, photovoltaics plus a heat pump is not the solution.
These are two systems that are each complicated enough to evaluate on their own.
Also, photovoltaics produce power exactly when you don’t need it.
Either you find the heat pump economically viable without photovoltaics, in which case you should install a heat pump. Or you don’t.
The same applies to photovoltaics. Either it is cost-effective, so go for it, or it’s not, so don’t.
There is only one situation where the two work well together, and that is for hot water in the summer. That’s basically free and saves you about 5–10 Euros per month. But that won’t be a deciding factor.
The rest of their interaction is just nice to have.
The question remains whether to optimize for self-consumption. For that, you would need to know your future electric vehicle and its usage patterns/load peaks (which you probably won’t), or you focus on lowering the cost per kWp, which typically means filling the whole roof.
The latter would be my choice.
These are two systems that are each complicated enough to evaluate on their own.
Also, photovoltaics produce power exactly when you don’t need it.
Either you find the heat pump economically viable without photovoltaics, in which case you should install a heat pump. Or you don’t.
The same applies to photovoltaics. Either it is cost-effective, so go for it, or it’s not, so don’t.
There is only one situation where the two work well together, and that is for hot water in the summer. That’s basically free and saves you about 5–10 Euros per month. But that won’t be a deciding factor.
The rest of their interaction is just nice to have.
The question remains whether to optimize for self-consumption. For that, you would need to know your future electric vehicle and its usage patterns/load peaks (which you probably won’t), or you focus on lowering the cost per kWp, which typically means filling the whole roof.
The latter would be my choice.
This is exactly why I am now trying to familiarize myself with this subject, so the sellers can’t just sell me anything.
How exactly do I determine:
- Hot water demand (50 liters per person??)
- Hot water storage size (double the daily demand??)
- Heating demand
- Required electricity to operate a water heat pump (for domestic hot water and heating)
- Required electricity to operate a water heat pump (only for heating / domestic hot water with solar power system)
How exactly do I determine:
- Hot water demand (50 liters per person??)
- Hot water storage size (double the daily demand??)
- Heating demand
- Required electricity to operate a water heat pump (for domestic hot water and heating)
- Required electricity to operate a water heat pump (only for heating / domestic hot water with solar power system)
T21150 schrieb:
Yes, it’s a bit of a gadget. We men need these kinds of toys. With an app. With graphics. The more details, the better.
However, my wife doesn’t really understand my idea of doing laundry and running the dishwasher mainly when there’s sunshine... the topic of self-consumption rate hasn’t yet reached level 10 enthusiasm with her and leads to shaking heads and doubts about my sanity. . It will come. . Surely. The enthusiasm.
Until then, I will connect smart plugs to the energy management system. Then the washer, dryer, and dishwasher simply won’t run unless there’s enough sun. Probably the recipe for increasing acceptance. I will report back. It will be great.Similar topics