Steca Solsafe Concept

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9/!/2'&,4/-(2#7"#*!,The Solsafe concept is a system which will automatically switch from a solar inverter connected to the public grid to a backup grid.

The installation of the Solsafe concept in a grid connected solar system enables to secure totally or partially the power supply in case of a power cut and allows the use of solar power when the grid is off.

:/'"+2/-,;,'4<'!"'3/-, Backup system for grid connected solar

installation.

Grid feeding with solar inverter.

Hassle free cabling, quick installation and easy commissioning with the Solsafe S-Box.

=#!#0'&,(*!1#3+2'"#*!,! Range of inverters

Compact Series :

All XPC serie

All C serie

All HPC serie

Xtender Series :

All XTH serie

All XTM serie

! RCC02 / 03 (Only for Xtender series)

Software vers. : 1.3.8 and higher

RCC User level : Expert

77&#('"#*!,6(>/0'"#(,

Not secured

Secured

Figure 1, Solsafe concept with the Solsafe S-Box

Application Note 003

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The Solsafe concept is a backup system for grid connected solar installations.

This solution enables to secure totally or partially the power supply in case of a power cut, and to keep on using the solar energy being produced.

are bi-directional. This allows integrating any of them into the Solsafe concept.

Figure 2, Solsafe concept

Compared to other similar solutions, the Solsafe concept offers the following advantages :

It allows a great flexibility by choosing independently the grid-feeding power (matching the solar generator) and the stand-alone power (matching the peak consumption of the user).

The grid-feeding inverter can be chosen with high voltage input range (lowering wiring costs).

The wiring can be optimized by placing the grid-feeding inverter near the solar field

It allows a possible upgrade of existing grid-connected installations.

The inverter-charger allows a fast charging from the grid (important in case of frequent power cuts hindering a complete charge of the battery).

The power available in case of islanding is added (inverter-charger Pnom + grid-feeding instantaneous power).

Its allows an upgrade of existing stand-alone installations that are connected to the grid afterwards (adding value to the investment)

It standardizes the amount of products to maintain and makes the staff training easier (this concept can be implemented with all our combis, XTH, XTM, XPC, Compact and HPC).

It allows to work with standard grid-feeding inverters and therefore gives access to better prices.

It ensures that no grid-feeding from the battery is possible, which actually a big concern for utilities is paying back each solar kWh supplied to the grid. Concretely it avoids that kWh’s paid at a low price from the grid, then stored in the battery, are then supplied and sold at a high price from the battery to the utility grid.

The Solsafe system can be fully wired by the installer. In that case, Steca is only supplying the inverter-charger (Xtender or Compact series) and the ARM-01 Module (for Compact series) or the preset Solsafe (for Xtender series).

The wiring schematics for the Solsafe system and Solsafe three phase system are at disposal in the appendices (available at the end of this document).

Solsafe S-Box

For the Solsafe system a genuine cabling solution exists, the S-Box.

The S-Box offers :

Hassle free cabling

Quick installation

Easy commissioning

The S-Box can be supplied in 4 versions :

S-Box 25A for Compact Series (S-Box-25C)

S-Box 25A for Xtender Series (S-Box-25X)

S-Box 25A with ENS Module for Compact Series (S-Box-25C-E)

S-Box 25A with ENS Module for Xtender Series (S-Box-25X-E)

Figure 3, S-Box

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Solsafe system behavior example

The graph below shows in detail the behavior of the Solsafe system in every possible case

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Steca Solsafe Concept

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