DescriptionThis DC / AC system is designed as solar home system. It consistsof four SolarWorld AG solar modules, each with a maximumpower of 80 Wp, a Steca charge controller with Maximum PowerPoint Tracking and one 12 V battery (BAE Batterien GmbH) with acapacity of 210 Ah. The central solar charge controller ensures thebattery is charged correctly and protects it against overcharging.In addition, two Steca stand-alone inverters are connected directlyto the battery so that AC appliances can be operated. Steca Solarix PI – Parallel connection: A stand-alone PV system is relatively difficult to size, since often the loads and their average running times are not adequately known, or because, when the system is subsequently expanded, more loads are added. This is where the simple expandability of the Steca Solarix PI inverters pays off. Up to four devices can be operated in parallel. The connectionsare made via an external box, the Steca PAx4.

Solar ModuleType: SolarWorld Sunmodule® SW 80 poly / RIAQuantity: 4Power: 80 WpSystem voltage: 12 V

Charge ControllerType: Steca Solarix MPPT 2010Quantity: 1Voltage: 12 / 24 VCharge current: 20 ALoad current: 10 AThe Steca Solarix MPPT 2010 solar charge controller is specially designed to work with all established module technologies and is optimized for solar systems with module voltages higher than the battery voltage.

InverterType: Steca Solarix PI 550 Quantity: 2System voltage: 12 VContinuous power: 500 VA per device

Steca PAx4 parallel switch boxQuantity: 1Up to four Steca Solarix PI inverters can be operated in parallel. The connections are made via an external box, the Steca PAx4.

BatteryType: BAE 12V 3 PVV 210Quantity: 1 Voltage: 12 VCapacity: 210 Ah

DC LoadsEnergy-saving lightsType: Steca Solsum ESLQuantity: 3Power: 5 W, 7 W, 11 WVoltage: 12 VLuminus flux: 250 lm, 370 lm, 650 lm

Refrigerator / freezer (additional application)Type: Steca PF 166 Solar refrigerator / freezer Quantity: 1 Input Voltage: 12 / 24 VConsumption: 110 Wh / day (Ambient tempera-ture 25 °C, Interior temperature 3 °C)

AC LoadsComputer, etc. for several hours per day

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DC / AC System 320 Wp

System components

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Applications- Lighting- Radio / cassette players- Small TV / TFT screen for about five hours a day or

a refrigerator (e.g. StecaPF 166 Solar refrigerator/ freezer provides 24 hoperating time / day)

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DC AC