WATTrouter ECO - user manual
www.solarcontrols.cz
How to fit and setup the device
Page 13 from 66
Figure 5: Three-phase connection with 2 current sensing modules and with low tariff signal circuit for CombiWATT mode. Here are
connected all 6 loads, where 4 loads are over SSR through the recommended SSRs RGC(S)1A manufactured by Carlo Gavazzi. This
connection is necessary if the PV-plant output is connected directly to a sealed distribution box, accessible only to the electricity
provider. This may be the case for PV-plants made originally only for feed-in tariff, without self-consumption possibility. Current sensing
module 1 is connected to the household wiring branch; current sensing module 2 is connected to PV-plant branch. The accuracy of
measurement is reduced down to ± 10% in this connection because of the finite impedance of current transformer secondary winding.
Caution: Current flow through current sensing modules must always be subtracted in this connection (marked with arrows on the
picture). The same phase sequence must be observed in the regulator and in both current sensing modules!