Fronius Ohmpilot - Selection of Heater; 1-Phase Heater; Example for Calculation of Charging Time

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Selection of Heater
- 0.3 to 3 kW
- Purely resistive load (no electronic temperature limiters, fans, etc.)
- 0.9 to 9 kW
- Equal load distribution on all 3 phases (e.g. 3 x 3 kW)
- If a mechanical temperature switch is being used, it must switch all 3 phases
simultaneously.
- Purely resistive load (no electronic temperature limiters, fans, etc.)
- Neutral conductor must be implemented (this can generally also be retrotted)
NOTE! A mechanical temperature switch simplies commissioning and use. If
no mechanical temperature switch is available, a temperature sensor can also
be connected to the Ohmpilot in order to limit the maximum temperature. (See
"Temperature limitation")
500-litre boiler, heater can be tted at the very bottom of the boiler, temperature spread
45 - 60 °C = 15 °C; 4.5 kW heater
Possible stored energy = 0.5 m³ x 1.16 kWh x 15 °C = 8.7 kWh
If the heater is fully activated, heating up takes approximately 2 hours (8.7 kWh / 4.5 kW)
NOTE! So that optimal use can be made of the surplus power and the hot wa-
ter is reheated quickly, the heater output should be adapted to the output of the
photovoltaic system, e.g. 5 kWp => 4.5 kW heater.
1-Phase
Heater:
3-Phase
Heater:
Example for
Calculation of
Charging Time: