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Free Gift: Hephis ChainSaw Keychain,Bottle opener Tracer3210AN/ Tracer4210AN Tracer AN series adopts common negative design and advanced MPPT control algorithm. The products can track the MPP point fast and accurately in any situation which will improve energy efficiency and obtain the maximum solar energy. Features: Advanced MPPT technology High tracking efficiency no less than 99.5% Peak conversion efficiency of 98% Ultra-fast tracking speed Accurately recognizing and tracking of multiple power point Multi-function LCD displays system information intuitively User programmable for battery types, load control etc. 3-Stage charge with PWM output Negative grounding design RS485 port with industrial standard MODBUS open architecture Fully programmable function via PC software or remote meter Electronic protections: PV reverse polarity protection PV short circuit protection PV over current alarm protection Battery overcharge protection Battery over discharge protection Battery reverse polarity protection Load short circuit protection Load overload protection Controller overheating protection Package Including: 1. 1x Solar Controller 2. 1x User Manual (English)3. 1x Hephis Keychain