Anker AC flexible set 1,6 kWh 4 × 250W flexible solar panels

PV generation before storage losses and AC limitation. Model basis for northern, central, and southern Germany: 920 / 1.020 / 1.150 kWh per kWp per year, adjusted for orientation, tilt, and shading. Season, daylight, and synthetic weather sequences distribute generation over 8.760 hours. Module power limits hourly peaks. For energy balancing, each hour is evenly divided into four quarter-hours. Measured weather data is not used.

A reference load profile derived from measurement data maps consumption over 35.040 quarter-hours and includes the peak loads. Day and night values ​​are scaled separately to your annual consumption and the selected daytime period (08:00 AM–18:00 PM). Solar power first covers current demand, and stored energy covers the remaining demand. AC and charging power limit the energy every 15 minutes. Self-consumption only counts energy actually delivered to the household. All comparisons use the same weather and consumption profiles.

Mini Power calculation assumption: Self-consumption × 1,20 (+20%). The planning scenario is limited by PV generation, annual consumption, and the AC output; it is not a measured efficiency increase or yield guarantee.

Source of the reference load profile, primary data from CoSSMic / ISC Konstanz: Open Power System Data (2020), Household Data, 2020-04-15 · CC BY 4.0 LicenseProcessing: Household residential5, year 2017; cumulative meter readings converted into 15-minute consumption and scaled to annual consumption and daily share. Time base: fixed Central European Time (UTC+1). A reference household, not a measurement of your consumption.

Assumptions: 90% of the nominal capacity is usable; charging and discharging together achieve 90% efficiency. The storage system starts empty. Residual energy is retained across daily and annual limits, but only counts as savings when used. With DC coupling, excess PV power can charge before the AC limit is reached; with AC coupling, PV power is first limited to the input AC power. Direct consumption, storage discharge, and grid feed-in share this AC limit. No grid charging or feed-in from the storage system.

Entire system, first year: Value of self-consumed solar power at the set electricity price plus compensation for the exported surplus.

For all comparisons, yield and usage are recalculated in each of the 20 years. The annual PV yield decreases linearly with the set module aging, and the electricity price changes annually with a compounding effect. The feed-in tariff remains constant. The total savings add up all annual values, including negative values; the average annual savings is this sum divided by 20. The net value subtracts the investment, including additional costs. Amortization is achieved when the cumulative savings cover this investment. The point in time within a year is linearly interpolated.

The single AC input is a common model limitation; separate PV and battery inverters require a more detailed calculation. Without a separate charging power input, only available PV power and free storage capacity limit charging. The scaled reference profile of a household and synthetic PV weather values ​​do not replace measurements of your system. Shorter peak loads (less than 15 minutes), battery aging, standby consumption, control systems, installation losses, and special load profiles for heat pumps or electric vehicles are not fully represented. Replacement purchases, maintenance, financing, and depreciation are not included. Higher AC power or larger storage capacities only increase savings if there is a usable surplus and corresponding consumption. Savings are not guaranteed.

Model estimate, not a guarantee of return. Monthly value = annual average; seasonal fluctuations.