Studer Solsafe concept Application Note page 3

Solsafe concept situations
The Solsafe concept can be described by these four different situations
The grid is present

K1 / AUX1 is in "bypass
mode".

K2 / AUX2 is switched on
the grid (feeding grid).

The grid charges the
batteries.
No grid and batteries
fully charged

K1 / AUX1 is in "power cut
mode": the backup inverter
supplies the consumers
from the batteries.

K2 / AUX2 is switched on
the grid. Solar energy is not
necessary as long as the
battery is "full".
No grid and batteries
partly charged

K1 / AUX1 is in "power cut
mode": the consumers are
supplied by the backup
inverter (batteries) and / or
solar energy.

K2 / AUX2 is switched on
the backup grid. Solar
energy is used for
supplying the consumers
and/or the batteries.(Bi-
directional output of
inverters)
No grid and batteries
discharged

K1 / AUX1 is in "bypass
mode" and disconnects
completely the consumers.
It will switch back in "power
cut mode" when the battery
will recover a partial
charged level.

K2 / AUX2 is switched on
the backup grid. Solar
energy is used for charging
the battery.
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K1, 2 are for Compact series and AUX1, 2 are for Xtender Series
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Page 3 / 7
Application Note 003