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20 Amp PWM Solar Charge Controller

20 Amp PWM Solar Charge Controller
Our Price:  £28.24(Exc. 20% VAT)(£33.89 Inc. VAT)

Model:  HPS-SC-20A
Weight:  0.2 kgs



Low stock, immediate despatch

This sophisticated charge controller will ensure the batteries are charged according to their voltage and type as Gel batteries need temperature compensation to charge them correctly. The controller will detect the voltage automatically for 12 or 24 volts. The controller can be programmed for switching the DC load output on/off using inbuilt light sensor so security or garden lighting etc. can be programmed to come on at dusk and off at dawn and any time period can be programmed using the control button. See the user manual for full instructions.


According to battery voltage, the controller will adjust the charging current and decide whether to supply power to the loads or not.
  1. Charging for lead acid battery
  2. Efficient, energy-saving and safe
  3. Temperature Compensation 
  4. Generally keep the battery at full voltage condition. 
  5. Prevent the battery from over-charging or over-discharging
  6. Prevent the current from battery going back to a solar panel during night.







Rated charge current





Rated load current





Work voltage

12v; 12/24V Auto

Over load, short circuit protection

1.25 rated load current 60sec, 1.5 rated loads current 5sec, over load protection action. ≥3 Rated load current short circuit protection action.

No load current


Charging circuit voltage drop

≤0.26 V

Load circuit voltage drop

≤0.15 V

Over voltage protection

(Solar panel side)

17V; ×2/24V

Work temperature

Industry stage-35℃ to +55℃

Boost charge voltage

14.6V×2/24V (keep 10min)

Direct charge voltage

14.4V; ×2/24V (keep 10min)

Float charge voltage

13.6V; ×2/24V

Charge return voltage


Temperature compensation

-5mv/℃/cell (Boost charge, Direct charge, Float charge, charge return voltage);

Lower voltage indicate

12.0V ×2/24V

Over discharge voltage

11.1Vno load- real-time modified voltage by the discharge rate ×2/24V

Over discharge return voltage

12.6V; ×2/24V

Control mode

PWM charge mode; modified discharge voltage by the discharge rate

Instruction Manual