ᐅ Is it still worthwhile to install a solar thermal system when you already have an air-to-water heat pump and photovoltaic panels?
Created on: 16 Dec 2019 13:08
L
ludwig88sta
Hello everyone,
We are planning to install a photovoltaic system on the fully south-facing pitched roof of our planned house. Since we also want underfloor heating, an air-to-water heat pump is currently our preferred heating option.
I have read here in the forum that with an air-to-water heat pump, a solar thermal system— which heats water using solar energy—would be unnecessary. In other words, on sunny days, the air-to-water heat pump powered by photovoltaic electricity heats the water more efficiently and cost-effectively, right?
Is this still the current understanding as of 2019, so that with a photovoltaic system plus an air-to-water heat pump, the roof is covered only with photovoltaic panels instead of leaving space for a solar thermal system? How did you approach this?
Thanks in advance and have a great start to the week,
ludwig88sta
P.S.: Side question: if you plan a photovoltaic system on the entire south-facing roof, what type of roof tiles do you use? Naturally, as affordable as possible. What do you think about photovoltaic roof tiles (tiles with integrated photovoltaic modules)? Probably more expensive than installing regular photovoltaic panels on a tiled roof, right?
We are planning to install a photovoltaic system on the fully south-facing pitched roof of our planned house. Since we also want underfloor heating, an air-to-water heat pump is currently our preferred heating option.
I have read here in the forum that with an air-to-water heat pump, a solar thermal system— which heats water using solar energy—would be unnecessary. In other words, on sunny days, the air-to-water heat pump powered by photovoltaic electricity heats the water more efficiently and cost-effectively, right?
Is this still the current understanding as of 2019, so that with a photovoltaic system plus an air-to-water heat pump, the roof is covered only with photovoltaic panels instead of leaving space for a solar thermal system? How did you approach this?
Thanks in advance and have a great start to the week,
ludwig88sta
P.S.: Side question: if you plan a photovoltaic system on the entire south-facing roof, what type of roof tiles do you use? Naturally, as affordable as possible. What do you think about photovoltaic roof tiles (tiles with integrated photovoltaic modules)? Probably more expensive than installing regular photovoltaic panels on a tiled roof, right?
C
CrazyChris7 Jan 2020 14:05boxandroof schrieb:
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Do not connect the heat pump to a separate electricity meter, so do not use a heat pump tariff, and let the photovoltaic system automatically supply all consumers in the house, including the heat pump. You can schedule the hot water generation during the day in summer. This way, for more than 6 months a year, you can heat domestic hot water with electricity from your own roof on 95% of the days. Leaving out the heat pump meter is not necessarily required. With cascade metering, it is possible to keep this meter and use photovoltaic electricity for both household power and the heat pump. The fixed fee for the second meter is usually offset by the lower tariff during the winter months.
Most grid operators now allow such cascade metering.
Search for ComMetering and check their website under Downloads. They offer a sample calculator to help you determine if it is worthwhile.
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