Truma SDC 12 Solar Dual Battery Charger
Official technical documentation and workshop diagnostics for Solar Charge Controller.
View official manual on manufacturer's site ↗Technical Specifications
Battery TypesGel, AGM (Absorbed Glass Mat) or liquid electrolyte, 12V lead-acid (6 single cells), 50-110Ah
Not Suitable For6V batteries, non-chargeable batteries, nickel-cadmium batteries
Controller TypeMPPT (Maximum Power Point Tracker) - an electronic DC-DC converter that optimises the match between the solar panels and battery
Device Elements01. Main fuse 20A / 02. DIP switches for battery type / 03. Solar input terminals (Pos/Neg) / 04. Main battery output terminals (Pos/Neg) / 05. Starter battery output terminal (Pos only) / 06. Temperature sensor socket (optional) / 07. LCD meter socket (optional) / 08. Status indication LEDs
Overvoltage ProtectionSolar controllers protect themselves against excessive battery voltage or switch off with defective additional charging systems (threshold 15.0-16.0V); sensitive consumers are protected by a charging voltage limit of 14.8V maximum
Compatible Solar ModulesTruma SM 25, 40, 65, 80, 100, 120, 150 or 180
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | 'Batt Low' LED illuminated | Main battery voltage is below 10.5V, the battery is discharged, has an insufficient connection, or the supply fuse has failed. | Check the battery connection and the supply fuse, and charge or replace the battery as needed. Contact Truma Service if this doesn't resolve it. | DIY Check / Tech Fallback |
N/A | 'MPP' LED illuminated | N/A - this is normal. | The charge controller is charging the battery. No action needed. | DIY Safe |
N/A | 'MPP' LED short flashing | N/A - this is normal. | The charge controller is ready to charge. No action needed. | DIY Safe |
N/A | '>80%' LED illuminated | N/A - this is normal. | The main battery is nearly fully charged - nothing to do here. | DIY Safe |
N/A | '>80%' LED flashing at 1 pulse/sec | The charge controller has overheated. | Let the controller cool down and check it has enough ventilation around it. Contact Truma Service if this doesn't resolve it. | DIY Check / Tech Fallback |
N/A | '>80%' LED flashing at 2 pulses/sec | Overvoltage from the main battery or solar panel. | Check the connections and voltages on both the battery and solar panel. Contact Truma Service if this doesn't resolve it. | DIY Check / Tech Fallback |
N/A | 'Batt Full' LED illuminated | N/A - this is normal. | The battery is fully charged. No action needed. | DIY Safe |
N/A | All LEDs flashing | Battery type selection (DIP switches) is incorrect. | Check the DIP switch setting on the underside of the Charge Controller matches the battery type actually fitted. Contact Truma Service if this doesn't resolve it. | DIY Check / Tech Fallback |