Appendix
138
Due to our policy of continuous product innovation, some specifications may change without notice.
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Total Ampacity of the Home 8 and PV Inverter is
≤
200A (Partial Backup
with the Non-Backup Panel located Upstream of the SE Box)
1) The sum of the ampacity of the main breaker in the SE Box and the ampacity of the main breaker
in the non-backup panel should not exceed the service ampacity.
2) The total ampacity of the breakers for the Home 8 and PV inverter should not exceed the
ampacity of the main breaker in the SE Box.
3) The ampacity of the main breaker in the backup panel should not exceed the ampacity of the
main breaker in the SE Box.
4) It is recommended that the PV CT be located in the SE Box.
5) In this case, external CTs are required to measure the site net metering. The additional CTs can be
purchased from LGEUS, and the installers must prepare these CTs ahead of the installation. CTs
not supplied from LGEUS may give the wrong measured value for site net metering.
6) The energy meter in the SE Box can measure up to 400A (2 x 200A CT). If the service ampacity
is greater than 200A, 2 x 200A CTs are required to measure the site net metering.For example, in
the case of 400A service, two 200A breakers are used in the service equipment. Then 2 sets of
external site net CTs are required. Follow the instruction guide on external CT installation.
i) Under 200A service
Option 1) Use 1 set of external CTs to measure the site net power. The connector of the
internal site net CT should be removed in the SE Box.
Option 2) Use 1 set of external CTs to measure the non-backup loads. In this case, do not
remove the connector of the internal site net CTs. The measured value of the external CTs is
added to that of the internal CTs.
ii) Over 200A service.
In general, the max ampacity of the main breakers is 200A at the residential size. One can be
used as the dedicated breaker for the SE Box and the other can be used as the non-backup
load. In this case, only 1 set of external CTs is required for the dedicated breaker for the non-
backup load.
Smart
Energy Box
Stop
Switch
Home 8
Backup Panel
Backup Load
AC Power
DC Power
Communication
New or Existing Solar System
PV
inverter
New or Existing Solar System
PV
inverter
Home 8
PV Sub-panel
PV CT
Home 8 Sub-panel
Main Panel
Option 1)
External CT (Site net metering)
Option 2)
External CT
(non-backup load)
Non-backup
Load