Knowledge & Tips

Summer operation of solar systems in motorhomes – managing heat correctly In summer, equipment compartments in motorhomes, camper vans, and expedition vehicles can heat up significantly. Temperatures of 40 to 60 °C are not uncommon. These conditions pose a particular challenge even for high-quality solar charge controllers like Victron MPPT SmartSolar and BlueSolar. How heat actually affects Victron MPPT solar charge controllers Victron MPPT controllers are robustly designed and built for high temperatures. Nevertheless, there are physical limits here as well: Nominal power is generally achieved up to an ambient temperature of approximately 40 °C. If the temperature rises above...

Passive vs. Active Cooling in Victron MPPT Solar Charge Controllers – Technical Differences Many solar charge controllers use either passive or active cooling to dissipate heat. Victron MPPT controllers such as SmartSolar and BlueSolar are no exception. The distinction is technically real: Passive cooling – how it works and when it is sufficient Passive cooling uses natural heat dissipation via the housing and air contact, without any mechanical parts. It is often perfectly sufficient, depending on: Controller power rating Ambient temperature Installation location: open vs. enclosed Thermal contact with metal parts or exterior walls Examples: A low-power MPPT controller in...

Typical installation errors with Victron MPPT controllers – Technical tips MPPT solar charge controllers, even high-quality models such as Victron SmartSolar and BlueSolar, can overheat due to improper installation. Often, the controller itself is not the problem, but rather the environment and the installation method. Common installation errors Insufficient clearance from the wall (recommended: 5–10 cm for air circulation) Installation in enclosed control cabinets without ventilation Heat sources directly next to the controller, e.g., inverters or chargers Lack of airflow or convection Horizontal instead of vertical mounting, which promotes air buildup Technical background Victron MPPT controllers reach their nominal output...

Why Victron MPPT Controllers Throttle in Heat – Technical Background Victron MPPT solar charge controllers, such as SmartSolar and BlueSolar, feature thermal protection mechanisms that reduce power output once the internal temperature becomes too high. This so-called derating prevents damage to the electronics and is a standard protective mechanism. Causes of Overheating Strong sunlight exposure on the solar charge controller housing High PV output over an extended period Installation in cramped control cabinets or technical rooms Insufficient air circulation Technical Details on Derating Victron MPPT controllers achieve their rated output up to ~40 °C ambient temperature Above 40 °C, automatic power reduction...