... recognition 3. CE certificate. 4. 3 years warranty. Maximum Power Point Tracking Solar Controller:S-MPPT15 15A Solar Charge Controller S ... panels, letting the solar panels always work at Maximum Power Point of V-A curve. Compared with ordinary solar controller, this ... series, 24V series and 48V series. MPPT advantage:Maximum Power Point Tracking (MPPT in short) system is a system which allows ...