MPP solar controller for high-quality motorhomes, caravans and boats.

For solar modules with:
- up to 430 Wp module output
- max. 26 A module current
- max. 50 V module voltage

Charging options: 1 supply battery and 1 starter battery

Votronic solar controllers of the "MPP" (Maximum Power Point) series with "IU1oU2" charging characteristic are connected as a link between the solar panel(s) and battery(ies).

With MPP technology, the controller automatically determines the maximum power output (MPP) of the solar modules several times per second. It then transforms the excess voltage of the solar module into a higher charging current for the battery (realized by high-frequency switching regulator technology with high efficiency). This additional charging current ensures shorter charging times and the best possible power utilization of the solar system. MPP solar controllers work fully automatically, are maintenance-free and offer the following functions: - MPP charging current increase of 10 % to 30 % (efficiency > 95 %) compared to conventional controllers through the use of the latest controller technology (microprocessor). The increase in performance is particularly noticeable in the cooler months of the year and e.g. during high fog conditions, low and diffuse lighting (wintering).
- Switchable charging characteristics for optimum charging of gel/dryfit, AGM/non-woven or acid/wet and LiFePO4 batteries (see Table 1).
- The charging voltage is free of peaks and regulated in such a way that overcharging of the batteries is impossible.
- Two battery charging outputs: Automatic charging of the main or on-board battery (Board I), support charging and charge retention (max. 1 A) of the vehicle starter battery (Start II) with protection against overcharging.
- Monitoring-free charging: Standard protection against overload, overheating, reverse polarity and reverse battery discharge (if solar power is too low, e.g. at dusk, at night, etc.).
- Parallel/buffer operation: Charging characteristics are maintained even with simultaneous operation of consumers.
- Overcharge protection: Reduces the charging current of the battery if there is too much solar power and the battery is full, ensures that the battery is charged to the highest possible level by immediately recharging when power is consumed.
- "IU1oU2" charging characteristic: Defined charging voltage increase (U1) prevents harmful acid stratification and ensures equalization charging of the individual battery cells, followed by automatic trickle charging (U2).
- Charging cable compensation: Voltage losses on the charging cables are automatically compensated for.
- On-board power supply filter: Problem-free parallel operation with wind and gasoline generators, mains chargers, alternators, etc.
- Connection for external battery temperature sensor Automatic adjustment of the charging voltage to the battery temperature. Improves full charging of the weaker battery in cold weather, avoids unnecessary battery gassing in summer temperatures; increases battery service life. Highly recommended if the battery is exposed to strong temperature fluctuations, e.g. in the engine compartment.
- Ready to plug in for connecting the VOTRONIC Solar display units for optimum control of the system

Ambient conditions, humidity: max. 95% room humidity, non-condensing

Scope of delivery: Operating instructions, charge controller Mpp 420 (Votronic 13039)