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Application Note 003
Solsafe system behavior example
The graph below shows in detail the behavior of the Solsafe system in every possible case
OK OK
Grid present and battery in floating phase. The solar production is sold to the grid.
No grid, no solar production (night time). Secured loads supplied by the inverter-charger.
No grid but solar production. Secured loads are supplied by the solar production and if necessary
by the inverter-charger.
No grid but solar production. Secured loads are supplied by the solar production. The excess of
the solar production is used to charge the battery.
No grid and battery voltage too low (battery fully discharged).
Loads will stay disconnected until battery has recovered 25% capacity.
Grid present. The charge of the battery is done from the grid.
The solar production is sold to the grid.
Grid
Secured loads
Battery
voltage
Secured loads
power
Solar power
K14-K15
K11
K13
K12
General descriptions
Relays descriptions
K1 / AUX 1 is always actuated until warning for LVD (low voltage disconnection), and actuated again when
battery level is 50%.
K2 / AUX 2 is actuated when the unit is in inverter mode (no AC in) with a battery voltage which is less than
the absorption voltage and the temperature less than 65°C.
K14 is closed when the grid is present or when K11 is open.
K15 force K14 when the grid is present.
K12 and K13 are mechanically and electrically interlocked.
K11 and K14 are mechanically and electrically interlocked.
K1/
AUX1
K2/
AUX2
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