Steca PR2020 Charge Controller


The Steca PR charge controllers were launched in 2004 as the fifth generation of charge controller technology (up to 900 Wp). This state of the art product upgrades the Steca Solarix series by a customer designed LCD which shows the accurate state of charge (SOC) in percent and as battery gauge symbol. The heart of the controller is the integrated circuit called ATONIC®II, which contains the improved regulation software based on a self learning algorithm.

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Product by: Steca


One of Steca’s bestsellers are the photovoltaic controllers of the Solsum C series which are used in small solar home systems with a 5 to 10 Amp solar charging and load current capacity (up to 240 Wp). The Solsum C series was launched in 2004 as a redesign of the Solsum X series.

The C series advantages are large connection terminals, fully covered PCB and a easy to understand display. The electronic board uses automized through hole technology for easy local maintenance.


PWM shunt battery charging
State of charge (SOC) battery regulation
Built in Ah counter
Boost-, Equalising -, Float charging
Automatic load reconnection
Manual load switch
Automatic selection of voltage (12 V / 24 V)
Temperature compensation
Data logger
Positive grounding (or) Negative grounding on one terminal
Field adjustable parameters by two buttons
Lighting control options during nighttime
Interface to prepayment unit
Optional: external temperature sensor

Protection functionality:

High voltage disconnect (HVD)
Low voltage disconnect (LVD)
Dept of discharge disconnection (DOD)
Reverse polarity of solar modules
Reverse polarity of load & battery
Electronic fuse
Short circuit of solar modules
Short circuit of load
Over temperature
Over voltage
Lightning protection by varistor
Open circuit battery
Reverse current at night

Technical Specification

Electrical Data PR2020 : 20 Amps

Operating voltage : 12 V or 24 V ; automatic recognition
Voltage range : 12 V 6.9 V – 17.2 V
Voltage range : 24 V 17.3 V – 43.0 V
Permitted operating temperature range : -10 °C to +50 °C
Permitted storage temperature range : -20 °C to +80 °C
Power consumption mA : 12,5 mA
PWM-Frequency : 30 Hz
Maximum input voltage : < 47 V
Minimum battery voltage :  6.9 V

Fitting and construction

Terminal (fine / single wire) : 16 mm2 / 25 mm2 – AWG 6 / 4
Degree of protection : IP 32
Dimensions (X x Y x Z) : 187 x 96 x 45 mm
Weight approx. : 345 g

Excess Temperature Protection

Disconnect load : >85 °C
Reconnect loadt : <75 °C

Mechanical Data

Protection type : IP 32
Installation : wall installation
Weight : 350 g
Housing : recycledable, plastic housing
Dimensions L x B x H : 187 x 96 x 44 mm
Fastening hole clearance : vertical 60 mm; horizontal 177 mm
Terminals (fine / strand) : 16 mm²/ 25 mm² / AWG: 6 / 4 mm²

Data Sheet
Installation Manual
Warranty Steca Gurarentee conditions PV products

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