As part of our new build, we plan to install a photovoltaic system on the roof. The roof area is approximately 160sqm (1,720 sq ft), with a pitch of 25 degrees, a gable roof with one side facing northeast and the other southwest. Since we are both civil servants and income from photovoltaic systems requires approval and may later be counted towards our pension, feed-in is not an option for us.
The system is intended solely to reduce our electricity consumption. We will have a ground-source heat pump with a borehole, a 300l (80 gallons) hot water storage tank, and a ventilation system for heating. The house is designed to meet KFW 55 standard (higher efficiency is no longer possible due to the basement).
Since I am home starting at midday, appliances such as the washing machine, dryer, dishwasher, and others will mainly be used during the day.
Additionally, we live in an area with above-average sunshine and fewer cloudy days, even in winter.
We do not want a battery storage system yet, even though this means we will occasionally export surplus electricity. Once batteries become more affordable, we plan to add one later.
How should the system be sized for our needs?
The system is intended solely to reduce our electricity consumption. We will have a ground-source heat pump with a borehole, a 300l (80 gallons) hot water storage tank, and a ventilation system for heating. The house is designed to meet KFW 55 standard (higher efficiency is no longer possible due to the basement).
Since I am home starting at midday, appliances such as the washing machine, dryer, dishwasher, and others will mainly be used during the day.
Additionally, we live in an area with above-average sunshine and fewer cloudy days, even in winter.
We do not want a battery storage system yet, even though this means we will occasionally export surplus electricity. Once batteries become more affordable, we plan to add one later.
How should the system be sized for our needs?
T
toxicmolotof6 Mar 2017 21:02That would be at most 16 modules, assuming the dimensions fit reasonably well. Standard modules are typically 160x100cm (63x39 inches).
32x300 = 9.6 kWp
The rest should be planned by a professional, as I can hardly assist you further. An individual assessment is more useful than guessing here.
32x300 = 9.6 kWp
The rest should be planned by a professional, as I can hardly assist you further. An individual assessment is more useful than guessing here.
T
toxicmolotof7 Mar 2017 08:18Which region are you in? Unfortunately, I can’t see that on TT.
T
toxicmolotof7 Mar 2017 22:37Since this is not common in our region, I recommend a forum for this specific topic that has a mostly blue design with some yellow accents and can likely be found quickly by searching for “photovoltaic forum com” on Google. The real experts and enthusiasts on this subject gather there. You will also probably find suppliers who are active in your area.
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