VC Solar App - Configuration

german power mix

kg/kWh

A solar panel does not emit any CO₂ when generating electricity. CO₂ is only emitted during the production of solar modules due to the manufacturing energy required. To calculate the CO₂ savings, the amount of energy generated by the PV system is compared with the CO₂ equivalent of the German power mix.

german power mix (year)

year (a)

The value for the CO₂ equivalent of the German power mix is updated annually. State the year for which the "German power mix" value was specified here.

manufacture costs modul

kg/kWp

The CO₂ emissions of a PV module are often expressed in kg CO₂ per installed kilowatt peak (kg CO₂/kWp) to quantify the environmental impact of manufacturing and installation. The life cycle analysis of a PV module shows that the CO₂ emissions for the production, transportation, installation and disposal of a module can range from around 500 to 1,500 kg CO₂ per kilowatt peak (kg CO₂/kWp).

This value varies depending on factors such as:

- Manufacturing technology and location: Production processes and energy sources in the country of manufacture influence emissions.

- Transport routes: Long transport routes can worsen the CO₂ balance.

- Module materials: Different materials and their fabrication can lead to different emission values.

electricity demand per person

kWh/Person/a

Electricity consumption per person varies greatly depending on the region, lifestyle and technological equipment. In Germany, the average annual electricity consumption per person is around 1,300 to 2,000 kilowatt-hours (kWh). However, this amount can vary depending on the household and individual habits. In the finished app, the electricity demand can be calculated automatically based on the size of the household.

electricity demand heat pump

kWh/m²/a

To calculate a simplified estimate of the electricity demand of a heat pump per square meter, average values for the efficiency of the heat pump are used.

- A well-insulated building has an annual electricity demand of 18 kWh/m²

- An averagely insulated building has an annual electricity demand of 25 kWh/m²

- A poorly insulated building has an annual electricity demand of 38 kWh/m²

electricity demand car

kWh/100km

The amount of electricity an electric car consumes per 100 kilometers depends on several factors, including the type of vehicle, driving style, road conditions and the use of air conditioning or heating. In general, the energy consumption of electric cars is around 15 to 20 kilowatt hours (kWh) per 100 kilometers.

storage degradation

%/a

Storage degradation refers to the process of gradual reduction in the performance of an energy storage system over time and use. This degradation can be seen in reduced capacity, reduced charging and discharging efficiency and a shorter service life of the storage system.

The storage degradation indicates the annual percentage of capacity losses of the storage system compared to the previous year.

storage losses

%/a

When using a PV storage system, various losses affect the overall efficiency. These losses mainly originate in the following areas:

- Conversion losses (DC/AC and AC/DC)

- Storage losses

- Self-discharge of the battery

- Losses due to the battery management system

- Circuit losses

This means that around 20% of the PV energy generated is lost. The actual losses can vary depending on the specific system and operating conditions.

amortization periode

years (a)

An amortization period is assumed for the calculation of profitability. This is 20 years on average and can be adjusted here if necessary.

maintenance portion

%

The operating costs of a PV system include various aspects that are incurred regularly or over the lifetime of the system. For PV systems, the operating cost ratio is usually between 1% and 5% of the investment costs per year. This rate can vary depending on the size of the system, location, quality of components and specific maintenance requirements. Smaller systems tend to have higher operating cost ratios, while larger systems benefit from effects of scale and have lower ratios.

number of persons

Number

Pre-set number of people belonging to the household.

living space

m²

The size of the living space is required to calculate the individual amount of electricity required by the heat pump each year.

annual driving distance

km

The driving distance is required to calculate the individual share of the e-car in the annual electricity demand.

direct consumption portion

%/a

The direct consumption share of a PV system refers to the proportion of self-generated solar power that is consumed directly in the household instead of being fed into the public grid. A high proportion of direct consumption can increase the profitability of the PV system, as the self-consumed electricity reduces the cost of purchased grid electricity. By increasing the proportion of direct consumption, savings on electricity costs can be maximized and the payback period of the PV system can be shortened.

storage consumption portion

%/a

The storage consumption share of a PV system describes the proportion of self-generated solar power that is initially stored in a battery storage system and later consumed in the household. A high proportion of storage consumption can increase the autonomy of a household, as more of the solar power generated can be used even when the PV system is producing little or no energy (e.g. at night or in bad weather).

grid purchase costs

€/kWh

Grid purchase costs for a PV system refer to the costs for the electricity that a household or company must purchase from the public grid if the self-generated solar power is not sufficient to cover the current demand. These costs can be reduced through various measures.

feed in tariff

€/kWh

The feed-in tariff for PV systems is the price that operators of a PV system receive for the solar power fed into the public grid. This tariff is often determined by statutory regulations and subsidy programs and can vary depending on the country and when the system is installed.

electricity prise increase

%/a

The rise in electricity prices is an important factor that owners of PV systems should take into account. Rising electricity prices make self-generated solar power increasingly valuable compared to grid electricity and improve the profitability of the PV system.

equity capital

€

The equity capital associated with PV systems refers to the financial assets or resources that an owner or investor provides to buy, install and operate the system. It plays an essential role in the financing and profitability of the PV system.

credit periode

a

The credit period for a PV system refers to the period over which a credit to finance the system is repaid. The duration depends on various factors and can vary depending on the individual situation.

credit interest

%

The credit interest rate for a PV system refers to the interest rate at which the borrowed capital is provided for the construction or financing of the system. This interest rate is a crucial factor in the total cost of financing and directly influences the profitability of the investment.

electricity demand

kWh/a

The electricity demand of a PV system refers to the electrical energy demand that the PV system is to generate to cover self-consumption or to feed into the public grid. The demand can vary depending on the specific requirements and needs of the system owner.

In addition to the option of automatically calculating the electricity demand based on the parameters for household size, storage consumption and any existing electric car, an already known electricity demand can be specified directly, e.g. from the previous year’s consumption.

Option

Description

solar layer name

VC Solar consists of two components, which are also offered as a VC Solar Bundle. One is the VC Solar Backend for area-wide 3D solar potential analyses and the other is the VC Solar App for interactive solar potential analyses directly in the VC Map.

VC Solar Backend enables the precise determination of monthly direct, diffuse and global solar radiation on all roof and wall surfaces of your building stock. The software takes into account the shading caused by vegetation and city model objects. With a simple click on the respective surfaces, the solar radiation data is displayed and analyzed in intuitive diagrams. The software also allows the area-wide solar cadastre to be updated independently as required.

To integrate a pre-calculated solar layer from VC Solar Backend and make it available as an input layer for the profitability calculation, the layer name must be specified.

VC Solar Layer available

See "Solar Layer Name".

In addition to the solar layer name, it must be specified that a solar layer is available in order to activate the corresponding functions.

Create debug features

In the event of a bug, feature and console outputs can be generated to simplify troubleshooting.

efficiency

%

The efficiency of a PV system refers to the ratio between the electrical energy generated by the system and the irradiated solar energy. This efficiency is influenced by various factors and is decisive for the performance and profitability of the system.

costs

€/kWp

The cost per kWp (kilowatt peak) for PV systems varies significantly and depends on several factors, including the type of modules, installation costs, the size of the system and regional differences.

degradation

%

Degradation in PV systems describes the gradual loss of performance of the solar modules over time. This process is normal and is influenced by several factors. In general, the degradation of PV modules is collected and analyzed through extensive testing and long-term data to enable accurate predictions of future performance.

kWp per area

kwp/m²

The installed output of a PV system (kWp per m²) varies depending on the type of solar modules, their efficiency and the respective installation method.