Hello from Greece. I bought these chargers,(2) but I have a question for you and I hope you can help me. I have 4 photovoltaic panels. of 420 watts 13.15 amp (1640 watts 49.60 amp) the chargers do not give me this performance. I tried with the charger I had, (PWM) And I had the performance of the panels. The charging option is in SEL . Thanks.