Case study: self-consumption up to 80% with Power Reducer SA

The real case of a New-Zealand customer who was able to use only solar PV energy to produce all the hot water he needed thanks to self-consumption with Power Reducer SA.

John, living in Wellington, installed a small solar PV system of 2.25 kWp at home. Analysing the data provided by the monitoring system, it was clear that only a small quantity of homegrown energy was actually self-consumed (around 20-30%), whilst costs for producing hot sanitary water remained unvaried.

› Data of the system before installing Power Reducer SA

Energy produced Energy released to the grid Energy consumed Self-consumption
84.36 kWh 59.69 kWh 34.67 kWh 29.24%

Given the need to produce hot water during the whole year, John wanted a device capable of using the surplus energy available to heat water with a storage tank, with no changes to the existing system.

Hence, he opted for 4-noks Power Reducer SA, a device extremely easy to install, independent from the inverter installed and carrying the EMC certification.

Power Reducer allows to smartly divert the energy available (even few hundreds watts) to the immersion heater: its activation remains always within the energy production curve of the PV system. Therefore, water is heated without purchasing any energy from the grid.

The product has proved to meet expectations, and results were clear from the very beginning: the self-consumption capacity of solar PV system increased from 20 to 80%. The result was hot water produced for free, always available, and with zero gas consumption.

› Data of the system before installing Power Reducer SA

Energy produced Energy released to the grid Energy consumed Self-consumption
69.40 kWh 13.52 kWh 55.88 kWh 80.52%

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