Dometic MT-PP Series
Official technical documentation and workshop diagnostics for MT-PP Series.
Technical Specifications
ElectricalNominal system voltage: 12 V. Standby current consumption: max. 4 mA. Recommended solar panel output: MT 150 PP: 50–150 Wp, MT 230 PP: 50–230 Wp, MT 350 PP: 50–350 Wp, MT 550 PP: 50–550 Wp. Solar panel current: 0–9.5 A (MT 150 PP), 0–14.5 A (MT 230 PP), 0–22.0 A (MT 350 PP), 0–35.0 A (MT 550 PP). Unit fuse (Type FKS): 15 A (MT 150 PP), 20 A (MT 230 PP), 30 A (MT 350 PP), 40 A (MT 550 PP). Starting battery auxiliary charging: 0–0.8 A (MT 150 PP/230 PP), 0–1.5 A (MT 350 PP/550 PP) at 5 A fuse. AES/RE terminal max current: 0.2 A (200 mA).
Gas Or PressureNot applicable
Capacities DimensionsDimensions including mounting flanges: 131 x 77 x 40 mm. Weight: 150 g (MT 150 PP), 155 g (MT 230 PP), 165 g (MT 350 PP), 170 g (MT 550 PP). Protection type: IP20. Operating ambient temperature: -20 °C to +45 °C. Ambient humidity: <= 95 %, non-condensing.
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | The solar charge controller does not work. Possible Cause: Insulation faults, breaks or loose connections at the live cables, or a short circuit triggered the device fuse. | Check live cables for insulation faults, breaks or loose connections. If triggered by excess current, the device fuse must be replaced by an authorized service agent. | DIY Check / Tech Fallback |
N/A | The solar charge controller does not work. The 'Standby' LED is flashing. Possible Cause: No solar panel power generated (nighttime), low solar power due to objects/dirt blocking light, or reverse polarity protection activated. | Check for obstructions and ensure solar panels are not blocked by shadows. Remove dirt. Check correct polarity of solar panel wiring. | DIY Safe |
N/A | The solar charge controller does not work. The 'Laden' LED flashes once before switching to standby. Possible Cause: Overvoltage protection triggered because solar panel voltage (Voc) is too high (> 28.0 V). | Check solar panel voltage (Voc). Reduce the number of connected solar panels if necessary. | DIY Safe |
N/A | Unusually long charging time. The 'Laden' LED is flashing quickly. Possible Cause: High temperature protection (> 50 °C) or low temperature protection (lead < -30 °C, LiFePO4 < -20 °C) triggered, reducing charging voltage to 12.75 – 13 V. | Controller returns automatically to full charging voltage when temperature drops below 48 °C (high temp) or rises above 22 °C (low temp). | DIY Safe |
N/A | Low battery voltage. The '> 80%' LED and 'Batterie/n voll' LED light up. Possible Cause: No connection from the solar charge controller to the battery, incorrect cable cross-sections, or bad stripped cable ends. | Check connections, cable cross-sections, cable lengths, fuses, stripped cable ends, and measure voltages directly at the terminals. | DIY Check / Tech Fallback |
N/A | The 'Schwach' LED lights up (only MT 150 PP and MT 230 PP). Possible Cause: Low voltage (< 10.6 V) at the house battery. | Charge the house battery to avoid undervoltage. | DIY Safe |
N/A | All LEDs are flashing simultaneously. Possible Cause: The charging program is not set correctly. | Check and correct the setting of the charging program according to the battery type used via DIP switches. | DIY Safe |
N/A | 'AES/RE' terminal does not work. Possible Cause: No excess solar power generated, or load of connected consumers too high exceeding 200 mA output current. | Reduce the connected DC loads. | DIY Safe |