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5 | Electrical installation
18 / 40 Installation instructions sonnenBackup-Box
5.1 Emergency operation design
Before installation, the installer must explain or clarify with the operator the following
points.
• Emergency operation does not offer the same output as grid operation.
• Three-phase current is not available during emergency operation (as only one phase is
supplied with power).
• Which consumers should be supplied with power in emergency operation? The current
paths in the building network can be installed in such a way that phase L1 of the Backup-
Box (
emergency phase ) is laid on the phase that supplies power to the relevant con-
sumers. The electrical consumers which are crucial for the operator in emergency oper-
ation are relevant here. Different consumers which may be important during a grid out-
age are specified in the sample calculation presented below.
• How much capacity of the storage system should be reserved as an emergency buffer?
The following example can be used to determine this. This example is based on a grid
outage lasting one hour (the individual power consumption values are estimated values).
Electrical consumer Power
consumption
[W]
Active during
grid outage
[h]
Electrical work
[kWh]
Refrigerator 600 0.25 0.15
Freezer 600 0.25 0.15
Heating 700 0.25 0.175
Door/garage door opener 50 0.1 0.005
Aquarium pump 20 1 0.02
Lighting 500 1 0.5
Router, telephone 10 1 0.01
Flat-screen television/radio 100 1 0.1
Alarm system, grid-connected smoke
detector
50 1 0.05
Total 1.16
In this example, the total power requirement for a grid outage lasting one hour is approx.
1.2 kWh, in order to maintain the function of all of the listed consumers.
„
Use this calculation to determine with the operator which emergency buffer should be
set, taking the total capacity of the storage system and other requirements (e.g. from
sonnenFlat tariff) into account (see Setting the backup buffer [P. 32]).