• FAQ for the solar charge controller.
  • FAQ for the solar charge controller.

    What is a solar charge controller?

    Solar Charge Controller (or Regulator) is a device which protects the batteries in a solar electric system from being overcharged or being over-discharged. It is need in virtually all solar power systems that utilize batteries. With the development of technology, controller has more additional functions now, such as load control function, LCD display, hybrid system controllers etc.

    Can you charge controller be used for Lithium Batteries?

    Yes, Our ViewStar series is a programmable solar charge controller. The charging parameters are adjustable. User can check the battery characteristics and change the parameters accordingly.

    Why should the controller have temperature compensation function?

    As temperature rises, electrochemical activity in the battery increases. Similarly, as temperature falls, electrochemical activity decreases. Therefore, as temperature rises, charging voltage should be reduced to prevent overcharge, as temperature falls, charging voltage should be increate to avoid undercharge. In general, to assure optimum service life, use of a temperature compensated charger is recommended.

    The enclosure of charge controller:

    If the controllers are used indoors or outdoors but with box, user can choose IP30 solar controller.  For outdoor application, sometimes steam condenses to water when it touches a cold surface. And the water can come into controllers along with the wire. So it?s better to use high IP rating controller in humid area.

    What is an IP rating?

    IP (or "Ingress Protection") ratings are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc) and moisture. The numbers that follow IP each have a specific meaning. The first indicates the degree of protection (of people) from moving parts, as well as the protection of enclosed equipment from foreign bodies. The second defines the protection level that the enclosure enjoys from various forms of moisture (drips, sprays, submersion etc).

    First Digit (Solid particle protection)

    The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g., electrical conductors, moving parts) and the ingress of solid foreign objects


    Object size protected against

    Effective against



    No protection against contact and ingress of objects


    >50 mm

    Any large surface of the body, such as the back of a hand, but no protection against deliberate contact with a body part


    >12.5 mm

    Fingers or similar objects


    >2.5 mm

    Tools, thick wires, etc.


    >1 mm

    Most wires, screws, etc.


    Dust protected

    Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment; complete protection against contact


    Dust tight

    No ingress of dust; complete protection against contact

    Second  digit (Liquid ingress protection)

    Protection of the equipment inside the enclosure against harmful ingress of water


    Protected against

    Testing for



    Not protected




    Dripping water

    Dripping water (vertically falling drops) shall have no harmful effect.

    Test duration: 10 minutes

    Water equivalent to 1mm rainfall per minute


    Dripping water when tilted up to 15°

    Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle up to 15° from its normal position.

    Test duration: 10 minutes

    Water equivalent to 3mm rainfall per minute


    Spraying water

    Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect.

    Test duration: 5 minutes

    Water volume: 0.7 litres per minute
    Pressure: 80?100 kPa


    Splashing water

    Water splashing against the enclosure from any direction shall have no harmful effect.

    Test duration: 5 minutes

    Water volume: 10 litres per minute
    Pressure: 80?100 kPa


    Water jets

    Water projected by a nozzle (6.3mm) against enclosure from any direction shall have no harmful effects.

    Test duration: at least 3 minutes

    Water volume: 12.5 litres per minute
    Pressure: 30 kPa at distance of 3m


    Powerful water jets

    Water projected in powerful jets (12.5mm nozzle) against the enclosure from any direction shall have no harmful effects.

    Test duration: at least 3 minutes

    Water volume: 100 litres per minute
    Pressure: 100 kPa at distance of 3m


    Immersion up to 1 m

    Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1 m of submersion).

    Test duration: 30 minutes

    Immersion at depth of 1m


    Immersion beyond 1 m

    The equipment is suitable for continuous immersion in water under conditions which shall be specified by the manufacturer. Normally, this will mean that the equipment is hermetically sealed. However, with certain types of equipment, it can mean that water can enter but only in such a manner that it produces no harmful effects.

    Test duration: continuous immersion in water

    Depth specified by manufacturer

    What?s the wiring order of the off-grid system?

    1. Battery 2. Load 3.solar panel. Our controller has protection for wrong connections during installation. There won?t be damage to the controllers. However, we still suggest user use the controllers strictly following the instruction manuals.

    Is there any lightning protection for solar charge controller?

    Yes. Some level lightning protection is provided in the form of transient voltage protection on both the PV and battery connections in all Solar charge controllers. However, if you live in an area prone to lightning, you should add additional lightning protection devices. Keep in mind that even with additional lightning protection nothing is 100% lightning proof. Damage due lightning is not covered under warranty.

    How many charging mode does the controller have?

    There are three charging modes. They are ON/OFF, PWM and MPPT. MPPT is the most advanced. we have already developed MPPT charge controller with high performance, reliability, efficiency and fast tracking speed.