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Inverter Steca Solarix PI (550, 1100)

In developing the Solarix PI stand-alone inverter, Steca has brought about some innovations which are unprecedented in this form. These are, above all, parallel switching, 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 inverters specifically in photovoltaic systems. This shows up, in the way that a most diverse range of appliances is provided with a stable energy supply, whilst the inverter‘s own consumption remains low.

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

Protection functionality:

• 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

Technical data

Parallel switching

A stand-alone PV system is relatively difficult to size, sincethe loads and their average running times are often notadequately known, or because more loads are afterwardsadded.This is where the simple expandability of the Solarix PIinverters pays off. Up to four devices can be operated inparallel. The connections are made via an external box,the PAx4.From the outside, the combination of two, three or fourinverters functions like one device with a correspondinglyhigher capacity. Inside only one inverter continues to operatein case of open-circuit operation or low output, e.g.for the lighting. This has a positive effect on the electricityconsumption, since the devices which are not turned ondo not consume any power. Only when a higher capacityis called for, for example when a refrigerator is turned on,all the inverters are automatically switched on, thus ensuringtrouble-free operation.The Solarix PI inverters are all the same. Only via the connectionto the PAx4 parallel switch box one inverter isdesignated as the master. This device has control overthe system, whilst the other Solarix PI inverters operateas slaves.

Rotary switch

Operating the Solarix PI is made very easy by the largerotary switch on the front of the device.If the Solarix PI is being used as a single device, threedifferent modes of operation are possible, and these maybe selected using the rotary switch. The load detectionsection follows on from the ‘off’ setting on the far left.In this section, the switch can be turned continuously tomatch the power consumption of the smallest appliance.In order to reduce power consumption, the inverter isthen turned off, and it checks periodically whether an appliancehas been turned on. Only in this case the inverterswitchs itself on. The ‘on’ setting on the rotary switchfollows on from the load detection section. In this modeof operation, the inverter makes the output voltage continuallyavailable.If several inverters are connected in parallel, the requestedmode of operation is selected by using the rotaryswitch 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 onlythe master device is continually switched on, but all otherconnected inverters as well.The use of the rotary switch makes it possible to see veryquickly the current mode of operation.

Electronic fuse

One innovation in stand-alone inverters is the electronicfuse as it is employed by Steca in solar charge controllers.With this fuse, the Solarix PI is protected against overloads,and also against the accidental connection of the ACoutput to the public grid. Because the fuse is electronic, itdoes not need to be replaced after it has been triggered,as is the case with mechanical fuses. As soon as the problemwhich triggered the fuse has been remedied, theinverter automatically reverts back to its selected modeof operation.The Solarix PI is also internally protected against an incorrectwiring of the battery. In case of reverse polarity,the device remains undamaged, and there is no need toreplace the fuse.

Quick and robust control

The Solarix PI inverter has been developed to supply powerto a wide range of appliances. Thanks to the quickcontrol, even critical loads can be operated. At the heartof the controller is a DSP which takes on the extensivecalculation work. The inverter’s necessary robustness issupplied by a control software program which was developedin cooperation with a renowned research institute.

Low operating consumption

The stand-alone inverter availed of Steca’s 15 years of experiencein the field of stand-alone PV systems. This isreflected, for instance, in the low operating consumptionof the Solarix PI. In solar home systems, the inverter isconnected to the battery 24 hours a day. It is designed toconsume as little solar-generated energy as possible bothin load-detection and open-circuit modes.

Communication with Tarom charge controllers

A further Solarix PI innovation is the communication withthe solar charge controllers from the Steca Tarom andPowerTarom series. A data connection to the charge controllercan be created via the PAx4.

In this case, the inverter connected directly to the batterycommunicates the amount of energy that has been withdrawnto the solar charge controller. The controller is thusable to calculate the correct state of charge (SOC). Thismeans that these systems no longer need to be switchedto voltage-controlled operation or an additional currentshunt.

If the switch-off threshold of 30 % SOC is reached, theSolarix PI receives a signal from the solar charge controllerand subsequently switches itself off in order to protectthe battery from deep discharge. It turns itself back onagain once the SOC has reached the 50 % mark.

Inverters in our internet shop

You can buy this and other inverters and UPS for your backup or stand-by power syste in our internet shop.

To configure your system properly, you should determine necessary capacity of the storage batteries. .

Please go to our Internet-shop, section "Power electronics" to select the best inverter for your power system.

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