Technical data

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Steca Solarix PI

550, 1100

In developing the Solarix PI stand-alone inverter, Steca

has brought about some innovations which are unpre-

cedented in this form. These are, above all, parallel swit-

ching, the novel operating concept which uses a single

rotary switch, direct communication in order to calculate

the state of charge (SOC) with Tarom and Power Tarom,

and the electronic fuse. Furthermore, our many years of

experience have come into play for deploying these inver-

ters specifically in photovoltaic systems. This shows up, in

the way that a most diverse range of appliances is provi-

ded with a stable energy supply, whilst the inverter‘s own

consumption remains low.

550 W / 12 V

1,100 W / 24 V

1,100 W / 12 V

2,200 W / 24 V

1,650 W / 12 V

3,300 W / 24 V

2,200 W / 12 V

4,400 W / 24 V

Parallel switching

A stand-alone PV system is relatively difficult to size, since

the loads and their average running times are often not

adequately known, or because more loads are afterwards

added.

This is where the simple expandability of the Solarix PI

inverters pays off. Up to four devices can be operated in

parallel. The connections are made via an external box,

the PAx4.

From the outside, the combination of two, three or four

inverters functions like one device with a correspondingly

higher capacity. Inside only one inverter continues to ope-

rate in case of open-circuit operation or low output, e.g.

for the lighting. This has a positive effect on the electricity

consumption, since the devices which are not turned on

do not consume any power. Only when a higher capacity

is called for, for example when a refrigerator is turned on,

all the inverters are automatically switched on, thus ensu-

ring trouble-free operation.

The Solarix PI inverters are all the same. Only via the con-

nection to the PAx4 parallel switch box one inverter is

designated as the master. This device has control over

the system, whilst the other Solarix PI inverters operate

as slaves.

Rotary switch

Operating the Solarix PI is made very easy by the large

rotary switch on the front of the device.

If the Solarix PI is being used as a single device, three

different modes of operation are possible, and these may

be selected using the rotary switch. The load detection

section follows on from the ‘off’ setting on the far left.

In this section, the switch can be turned continuously to

match the power consumption of the smallest appliance.

In order to reduce power consumption, the inverter is

then turned off, and it checks periodically whether an ap-

pliance has been turned on. Only in this case the inverter

switchs itself on. The ‘on’ setting on the rotary switch

follows on from the load detection section. In this mode

of operation, the inverter makes the output voltage con-

tinually available.

If several inverters are connected in parallel, the reque-

sted mode of operation is selected by using the rotary

switch of the device connected to the ‘master socket’.

In addition to the modes of operation described above,

there is also the setting ‘all on’. This means that not only

the master device is continually switched on, but all other

connected inverters as well.

The use of the rotary switch makes it possible to see very

quickly the current mode of operation.

Electronic fuse

One innovation in stand-alone inverters is the electronic

fuse as it is employed by Steca in solar charge controllers.

With this fuse, the Solarix PI is protected against over-

loads, and also against the accidental connection of the

AC output to the public grid. Because the fuse is elec-

tronic, it does not need to be replaced after it has been

triggered, as is the case with mechanical fuses. As soon

as the problem which triggered the fuse has been reme-

died, the inverter automatically reverts back to its selected

mode of operation.

The Solarix PI is also internally protected against an in-

correct wiring of the battery. In case of reverse polarity,

the device remains undamaged, and there is no need to

replace the fuse.

Quick and robust

control

The Solarix PI inverter has been developed to supply po-

wer to a wide range of appliances. Thanks to the quick

control, even critical loads can be operated. At the heart

of the controller is a DSP which takes on the extensive

calculation work. The inverter’s necessary robustness is

supplied by a control software program which was deve-

loped in cooperation with a renowned research institute.

Low operating consumption

The stand-alone inverter availed of Steca’s 15 years of ex-

perience in the field of stand-alone PV systems. This is

reflected, for instance, in the low operating consumption

of the Solarix PI. In solar home systems, the inverter is

connected to the battery 24 hours a day. It is designed to

consume as little solar-generated energy as possible both

in load-detection and open-circuit modes.

Technical data

Sine

Wave Inverter

Power class

550 W - 4,400 W

0 W 500 W 1,000 W

10,000 W

5,000 W

Sine

Wave Inverter

Functions

Sine wave inverter with 550 W or 1,100 W

Inverter can be connected directly to the Steca Tarom

Good overload capacity

Optimal battery protection

Automatic load detection in standby mode

Up to 4 devices can be connected in parallel

Electronic protection functions

Battery deep-discharge protection

Switches off in case of battery overload

Overheating and overload protection

Short circuit protection

Internal fuse provides reverse polarity protection

Options

Available with 115 V / 60 Hz

or 230 V / 60 Hz

Displays

Three-colour LED shows the operating status

of the inverter



COMSHS VPS

Steca Solarix PI 550 1100

Nominal battery voltage 12 V 24 V

Input voltage range 10.5 - 16 V 21 - 32 V

Output voltage 230 VAC +/- 10%

Output frequency 50 Hz

Continuous power 450 VA 900 VA

Max. power 30 min. 550 VA 1,100 VA

Max. power 5 sec. 1,500 VA 3,000 VA

Max. asymmetric load 250 VA 350 VA

Max. efficiency 93 %

Own consumption standby 0.5 W

Consumption „ON“ at idle mode 4 W 7 W

Cos phi of load 0.1 - 1 (to Pnom)

Load detection (standby) yes

Battery deep discharge protection current driven or by Tarom

Over temperature protection yes

Electronical protection

Reverse polarity/over voltage/

over current/ socket to 230 V grid

Cable length battery/ AC 1.5 m / 1.5 m

Temperature range -20 °C to +45 °C

Enclosure protection class IP 20

Options parallel use over PAx4

Weight 5.5 kg 8.5 kg

Dimensions l x w x h 400 x 215 x 130 mm

Technical data at 25 °C / 77 °F