Selection Of Heater; 1-Phase Heater; Example For Calculation Of Charging Time - Fronius Ohmpilot Instructions De Service

Selection of heater

1-phase heater

Controlled in a continuously variable manner from 0 to 3 kW
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3-phase heater: Controlled in a continuously variable manner from 0 to 9 kW.
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Example for cal- 500-litre boiler, heater can be fitted at the very bottom of the boiler,
culation of char- temperature spread 45 - 60 °C = 15 °C;
ging time 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 acti-
vated, the heating up takes approx. 2 hours (8.7 kWh / 4.5 kW)
NOTE!
Power adjustment
So that optimal use can be made of the surplus power and the hot water is reheated
quickly, the heater output should be adapted to the output of the photovoltaic system,
e.g. 5 kWp => 4.5 kW heater.
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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 simul-
taneously.
Purely resistive load (no electronic temperature limiters, fans, etc.)
Neutral conductor must be implemented (this can generally also be retrofitted)
L1 L2 L3
Temperature limitation
A mechanical temperature switch simpli-
fies commissioning and use. If a mechani-
cal temperature switch is not available, a
temperature sensor can also be connected
to the Ohmpilot to limit the maximum tem-
perature. (See chapter "Temperature limi-
tation" on page 2.4)