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What is the Steca collection?
The Steca collection brings together solar charge controllers from the Solarix PRS and PR with display families, designed for off-grid 12/24 V systems. These are PWM controllers of 10, 15, 20, and 30 A that prioritize reliability, ease of use, and battery care, with electrical protections and charging algorithms suitable for lead-acid and sealed batteries (check lithium battery compatibility via external BMS).
Advantages and limitations
- Simple and very robust PWM architecture: excellent cost/performance ratio for small PV systems.
- Automatic 12/24 V detection and protections against reverse polarity, short circuit, and overload.
- PR versions with display to view voltages, currents, and charge status.
- Large terminals and passive cooling for demanding environments.
- Limitations: for large strings or high PV voltage, an MPPT offers higher performance and flexibility.
Applications
- Electrical autonomy in caravans, marine, and shelters.
- Telemetry, irrigation huts, and autonomous lighting.
- Compact solar kits with one or several panels in parallel.
How to choose your Steca
- Current (A): sum the short-circuit current (Isc) of the panels, apply a safety factor (≈1.25), and choose 10/15/20/30 A according to the result.
- System voltage: 12/24 V according to battery and inverter.
- With/without display: PR series for local reading and basic settings; PRS for maximum savings and simplicity.
- Cable section and distance: size to minimize voltage drop between panel–controller–battery.
Indicative specifications
| Nominal voltage | 12/24 V (automatic detection) |
| Charge current | 10 / 15 / 20 / 30 A (depending on model) |
| Technology | PWM with multi-stage charging |
| Indicators | LEDs (PRS) / LCD display (PR) |
| Protections | Overload, short circuit, reverse polarity, low battery |
| Typical use | Off-grid residential installations, marine, and mobility |
Best practices
- Install the controller close to the battery to reduce losses and improve voltage measurement.
- Respect Isc·1.25 and the appropriate cable section; protect with fuses on PV and battery.
- Set the battery type (if applicable) and check absorption/float voltages recommended by the manufacturer.
- Avoid connecting modules in series with PWM; operate at battery voltage (36/72 cell modules according to 12/24 V).
Comparisons and related accessories
If you need higher performance with long strings or high PV voltages, visit MPPT Controllers. To complete your installation, add Controller Accessories, DC Protections, and Solar Cable. You can also see alternatives by brand such as Victron.
With the Steca collection you have reliable and easy-to-install PWM controllers for compact off-grid systems, with models from 10 to 30 A and the option of a display for local control.
