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PWM chargers for solar panels

The budget solar controller

If you want to build a solar power system for yourself, then a solar charge controller is one of the items you need. Basically they are of two types: MPPT and PWM. MPPTs are of the new models, but they also have a higher price. PWM-controllers are an older and cheaper models, and are used for small and irresponsible objects.

Characteristics of PWM controllers

They produce up to 30% less energy than MPPT. They are recommended to work with solar panels with 36 cells (for 12Vdc systems), or with panels with 72 cells (for 24Vdc systems). They have limitations in the maximum voltage received by the photovoltaic panel. Most of them have a load output that protects the battery from excessive discharge. They are commonly used in small solar street lighting systems.

Inappropriate panels

These controllers do not perform well when used with 60 cell panels (on 24Vdc systems). It is highly inadvisable to combine 60 cell PVs and PWM controllers in 12Vdc systems. For the first two combinations, we advise you to work only with suitable MPPT-controllers.

Conclusion

PWM solar charge controllers are a low-cost option that is implemented in small and inexpensive systems. Their price is lower, but the production is also weaker. Take a look at our controllers and choose the one that suits you best. If you wish to consult, please write to us at: mail@chepakov.com.

  1. Solar Charge Controller with Negative Ground for Cars with Negative Grounding

    Nominal voltage: 12V / 24Vdc

    Max. solar panel current: 10A

    Max. load current: 10A

    • Load output with low battery voltage disconnect function. 
    • Lighting control function, one timer only. 
    • Two digit seven segment display for quick and easy setting of the load output functionality, including timer setting. 
    • Three stage battery charging (bulk, absorption, float), not programmable.
    • Load output protected against over load and short circuit.
    • Protected against reverse polarity connection of the solar array and/or battery.
    • Day/night timing options: see manual for details
    • Battery Voltage: 12/24 V with automatic system voltage detection
    • Rated charge current: 10A
    • Maximum solar voltage: 28V / 55V
    • Day/night timing and light dimming option;
    • PWM
    • Load Output;
    • Max. charging current: 10A; 12V or 24V systems.
    • Load output with low battery voltage disconnect function. 
    • Lighting control function, one timer only. 
    • Two digit seven segment display for quick and easy setting of the load output functionality, including timer setting. 
    • Three stage battery charging (bulk, absorption, float), not programmable.
    • Load output protected against over load and short circuit.
    • Protected against reverse polarity connection of the solar array and/or battery.
    • Day/night timing options: see manual for details
  2. Features -Load output with low battery voltage disconnect function. -Lighting control function, one timer only.
    • PWM charger with three-step charging algorithm
    • Day/night timing options
    • Maximum input voltage:  28 at 12vdc systems /55V at 24Vdc systems
    • Maximum charging current: 10А.
    • Load output with low battery voltage disconnect function. 
    • Lighting control function, one timer only. 
    • Two digit seven segment display for quick and easy setting of the load output functionality, including timer setting. 
    • Three stage battery charging (bulk, absorption, float), not programmable.
    • Load output protected against over load and short circuit.
    • Protected against reverse polarity connection of the solar array and/or battery.
    • Day/night timing options: see manual for details
    • Load output with low battery voltage disconnect function. 
    • Lighting control function, one timer only. 
    • Two digit seven segment display for quick and easy setting of the load output functionality, including timer setting. 
    • Three stage battery charging (bulk, absorption, float), not programmable.
    • Load output protected against over load and short circuit.
    • Protected against reverse polarity connection of the solar array and/or battery.
    • Day/night timing options: see manual for details
  3. Features -Load output with low battery voltage disconnect function. -Lighting control function, one timer only.
    • Load output with low battery voltage disconnect function. 
    • Lighting control function, one timer only. 
    • Two digit seven segment display for quick and easy setting of the load output functionality, including timer setting. 
    • Three stage battery charging (bulk, absorption, float), not programmable.
    • Load output protected against over load and short circuit.
    • Protected against reverse polarity connection of the solar array and/or battery.
    • Day/night timing options: see manual for details
    • Load output with low battery voltage disconnect function. 
    • Lighting control function, one timer only. 
    • Two digit seven segment display for quick and easy setting of the load output functionality, including timer setting. 
    • Three stage battery charging (bulk, absorption, float), not programmable.
    • Load output protected against over load and short circuit.
    • Protected against reverse polarity connection of the solar array and/or battery.
    • Day/night timing options: see manual for details
    • PWM charger with three-step charging algorithm
    • Day/night timing options
    • Maximum input voltage:  28 at 12vdc systems /55V at 24Vdc systems
    • Maximum charging current: 20А.
  4. Aluminum housing

    System voltage:   12/24 V auto recognition

    Max. charge/load current:   10 A

    • Charges two separate batteries;
    • Two digit seven segment display;
    • Three stage battery charging (bulk, absorption, float), not programmable;
    • Protected against reverse polarity connection of the solar array and/or battery.
  5. Solar Charge Controller with Negative Ground for Cars with Negative Grounding

    Nominal voltage: 12/24V

    Max. solar panel current: 10A

    • PWM charger with three-step charging algorithm
    • Day/night timing options
    • Maximum input voltage:  28 at 12vdc systems /55V at 24Vdc systems
    • Maximum charging current: 30А.
  6. Solar Charge Controller with Negative Ground for Cars with Negative Grounding

    Nominal voltage: 12/24V

    Max. solar panel current: 20A

  7. Aluminum housing

    System voltage:   12/24 V auto recognition

    Max. charge/load current:   30 A

  8. A very powerful charge controller with accurate PWM charging regulation and integrated temperature compensation. A bar chart clearly displays the battery state of charge, load status as well as whether the energy is flowing from or to the battery. The load circuit disconnect protection can be set in different modes: by the voltage in the battery or the state of charge (SOC)

  9. Solar Charge Controller with Negative Ground for Cars with Negative Grounding

    Nominal voltage: 12/24V

    Max. solar panel current: 40A