Pulse Width Modulation (PWM) battery charging and the unique control technology can greatly increase the lifetime of battery. It has various unique functions and easy to use. 2.1 Product Overview The controller is for off-grid solar system, and protects the battery from being over charged by the solar module and over discharged by the loads. off-gridpwmwindsolarhybridcontroller the product is manufactured according the jb/t6939.1-2004 industrial standard and gb/t 19115.1-2003 national standard also with users´ technical requirements. big lcd display.the images tell working state visually.various data show: real-time wind turbine voltage,current,power;solar panel voltage,current, … FUNCTION 1.Build-in industrial microcontroller.2.Single key settings, digital display, automatic memory function.3.Full 4-stage charging management PWM.4.Incorporation of short circuit protection, open circuit protection, reverse circuit protection, overload protection.5.Dual protection against mosfet Reverse current, low heat production. battery in the shortest time. • Advantages of PWM charge controller : • 1. Higher charging efficiency • 2. Longer battery life • 3. Reduce battery over heating • 4. Minimizes stress on the battery Ability to defuel fate a battery. • 1. Charging the batteries used in solar home system • 2. Solar lantern in rural area In this paper, solar charge controller using Maximum Power Point Tracking (MPPT) and Pulse Width Modulation (PWM) have been analyzed and compared, which is needed in all solar powered systems that utilize batteries. Its role is to regulate the power going from the solar panel to the batteries. Buyer beware! Many solar charge controllers that simply switch FETs differently than the on-off algorithm claim to be a PWM charger. Only a few controllers are actually using a Pulse Width Modulated (PWM) constant voltage charging algorithm. The rest are switching FETs with various algorithms that are cheaper and less effective. A PWM (Pulse Width Modulation) controller is an (electronic) transition between the solar panels and the batteries: The solar charge controller (frequently referred to as the regulator) is identical to the standard battery charger, i.e., it controls the current flowing from the solar panel to the battery bank to prevent overcharging the batteries. Solar charge controller User Manual I Functional characteristics: 12v/24v Auto working voltage,you also can choose the voltage of 36v/48v/60v/96v as well as lithium battery. Working current covers:1A,2A,5A,10A,15A,22A,30A,45A,60A,80A,100A Three-level overload protection,short-circuit protection PWM MPPT Pros 1/3 - 1/2 the cost of a MPPT controller. Highest charging efficiency (especially in cool climates). Longer expected lifespan due to fewer electronic components and less thermal stress. Can be used with 60-cell panels. Smaller size Possibility to oversize array to ensure sufficient charging in winter months. The GP-PWM-30 is a 12 volt flush mounted photovoltaic (PV) charge controller rated for a continuous solar current input of 30 amps. The GP-PWM-30 uses Pulse Width Modulation (PWM) technology and a unique four stage charging system that includes an optional equalize setting to charge and protect your battery bank. The GP-PWM-30 features an LCD 1.Connect the battery to the charge regulator - plus and minus.it will show 1 ,if it detects 12V battery, 2 if it detects 24V battery. 2.Connect the photovoltaic m