When charging a single phase EV on a three phase zappi, the power is always taken from zappi phase L1.
If there are several zappis installed together and they are all charging single phase EV’s then phase 1 will be heavily loaded and phases 2 and 3 will have very little load on them.
To share the load out more evenly it is possible to rotate the connection to each zappi so that the zappi L1 terminal is physically connected to a different phase of the supply.
If you make this change, then it’s also necessary to adjust the Phase Rotation setting in the Advanced/Supply Grid/Device menu.
So you can have :
|“L1” Terminal||“L2” Terminal||“L3” Terminal||Phase Rotation Setting|
|Zappi #1||Phase 1||Phase 2||Phase 3||1/2/3|
|Zappi #2||Phase 2||Phase 3||Phase 1||2/3/1|
|Zappi #3||Phase 3||Phase 1||Phase 2||3/1/2|
The CT connections to the zappi or harvi need to follow the phases at the supply point (ie at the electricity meter).
- the CT on phase L1 needs to be connected to zappi CT1,
- the CT on phase L2 needs to be connected to zappi CT2, and
- the CT on phase L3 needs to be connected to zappi CT3