Curtech 40Amp 12V LCD Solar Charge Controller



Advanced MCU control Pulse Width Modulated (PWM) technology, high efficiency operation.
For charging LiFePO4, LTO (Lithium Titanium Oxide), Gel, AGM, Conventional lead-acid (WET) and Calcium Batteries.
Built in regulator to prevent your battery from being overcharged. Overcharging occurs when the charge voltage is unregulated. This can result in premature battery failure.
Comes with regulator to prevent your battery from being under charged, in the solar energy field, battery undercharge always occurs, especially on some Conventional lead-acid or Calcium batteries. The unit provides an automatic Equalization feature for deeply drained Conventional lead-acid battery or Calcium battery, as well as provides a cycling automatic Equalizing feature every 28 days.
Can be connected to the battery permanently to keep the battery fully charged by using a process called “floating”. This means the controller will stop charging when the battery is full and will automatically start charging the battery as required. This process will also reduce water loss and help prevent the battery from ‘drying out’.
Protects your battery from discharge at night. Under low light or no light conditions the solar panel voltage could be less than the battery voltage. The unit contains a special circuit which prevents current flowing back from the battery and into the solar panel.
Coloured LEDs to easily indicate the operational status and battery conditions.
Digital LCD to directly display battery voltage, charging current, charging capacity (Amp hour), battery types and fault codes.
Multi charging protections against reverse polarity, short circuit, over temperature, over voltage, etc.
Surface Mount or Flush Panel Mount options.
Conformal-coating circuit boards and plated terminals apply to hostile environments.

Electrical Parameters

Rated solar panel Amps for CT12-40A
Normal input Solar cell array voltage
Max. solar cell array voltage (output has no load)
The controller lowest operating voltage (at solar or battery side)
Maximum voltage drop - Solar panel to battery

Charging Characteristics

Minimum battery start charging voltage
Soft start charging voltage
3-10VDC +/-0.2
Soft start charging current
Up to 20Amp
Bulk charge voltage
10-14VDC +/-0.2
Absorption charging voltage at 25°C
  • LTO type battery
14.0VDC +/-0.2
  • Gel type battery
14.1VDC +/-0.2
  • LiFePO4 type battery
14.4VDC +/-0.2
  • AGM type battery (default setting)
14.4VDC +/-0.2
  • WET type battery
14.7VDC +/-0.2
  • Calcium type battery
14.9VDC +/-0.2
Absorption transits to Equalizing or Float condition
  • Charging current drops to
1.0Amp +/-0.1
  • or Absorption charging timer timed out
4 Hours
Equalization charging active (Only for WET or Calcium battery)
  • Battery voltage discharged to less than
10VDC +/-0.2
  • Automatic equalizing charging periodical
28 Days
Equalization charging voltage at 25°C
15.5VDC +/-0.2
Equalization charging timer timed out
2 Hours
Float charging voltage at 25°C
  • For LTO and LiFePO4 battery
13.4VDC +/-0.2
  • For Gel, AGM, WET and Calcium battery
13.6VDC +/-0.2
Voltage control accuracy
+/- 1%
Battery temperature compensation coefficient
-24 mV/°C
Temperature compensation range
-20 to +50°C


Against reverse polarity or short circuit
No reverse current from battery to solar at night
Over temperature protection during charging
Transient over voltage protection with TVS or varistor

Electrical parts

Input output terminal
M5 terminals
Remote port
RJ-11 (6 pins)

Physical Parameters

Controller material
Plastic, Standard ABS
Power terminal maximum stranded wire size
#6 AWG stranded 16mm2
Power terminal torque
Up to 17 in-lb (0.2n-m)
Vertical wall mounting
IP grade
Net weight
Approx. 300g

Environmental characteristics

Operating temperature
-25 to 50°C
Storage temperature
-40 to 85°C
Operating Humidity range
100% no condensation


  • Model: [CT12-40AL]

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