PS200 12 V Power Supply with Charging Regulator and 7 Ah Rechargeable Battery
Optimized Power Performance
Manages voltage and amperage to protect battery
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The PS200 is a 12-Vdc battery with a charge controller. The controller manages amperage and voltage for safe, optimized battery charging from a solar-panel or AC power source. It also measures various input, output, and status parameters to allow close monitoring of the battery during charging and use. The PS200 includes a 12-Vdc lead-acid battery, while the CH200 is for use with a user-supplied battery.

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Benefits and Features

  • Protects against high-amperage and high-voltage damage to power supply
  • Ability to monitor both load and battery current
  • Battery reversal protection
  • Real-time measurements of charge input voltage, battery voltage, on-board temperature, battery current, and load current
  • Two-step constant voltage charging and temperature compensation optimize battery charging and increase the battery’s life
  • Allows simultaneous connection of two charging sources (e.g., solar panel, ac wall charger)


Detailed Description

The PS200 power supply consists of a rechargeable, 7 A h, valve-regulated lead-acid (VRLA) battery and a charging regulator. This microcontroller-based smart charger has two-step constant voltage charging and temperature compensation that optimize battery charging and increase the battery’s life.

Two input terminals enable simultaneous connection of two charging sources. The PS200 also incorporates a maximum power point tracking algorithm for solar inputs that maximize available solar charging resources. RS-232 and SDI-12 terminals allow the PS200 to convey charging parameters to a datalogger.

The PS200 has several safety features intended to protect the charging source, battery, charger, and load devices. Both the SOLAR – G and CHARGE – CHARGE input terminals incorporate hardware current limits and polarity-reversal protection.

A fail-safe, self-resettable thermal fuse protects the CHARGE – CHARGE inputs in the event of a catastrophic AC/AC or AC/DC charging source failure. Another self-resettable thermal fuse protects the 12 V output terminals of the charger in the event of an output load fault.

The PS200 also has battery-reversal protection, and includes ESD and surge protection on all of its inputs and outputs.


Operational Temperature -40° to +60°C (VRLA battery manufacturers state that “heat kills batteries” and recommend operating batteries at ≤ 50°C.)
Dimensions 19 x 7.6 x 10.6 cm (7.5 x 3 x 4.2 in.)

CHARGE - CHARGE Terminals (AC or DC Source)

AC 18 to 24 V RMS (with 1.2 A RMS maximum)
DC 16 to 40 Vdc (with 1.1 A DC maximum)

SOLAR Terminals (Solar Panel or Other DC Source)

-NOTE- Battery voltages below 8.7 V may result in less than 3.0 A current limit because of fold-back current limit.
Input Voltage Range 15 to 40 Vdc
Maximum Charging Current 4.0 Adc typical (3.2 to 4.9 Adc depending upon individual charger)

Quiescent Current

No Charge Source Present 300 μA maximum
No Battery Connected 2 mA maximum

Battery Charging

-NOTE- Two-step temperature-compensated constant-voltage charging for valve-regulated lead-acid batteries; cycle and float charging voltage parameters are programmable with the default values listed.
CYCLE Charging Vbatt(T) = 14.70 V - (24 mV) x (T-25°C)
FLOAT Charging Vbatt(T) = 13.65 V - (18 mV) x (T-25°C)
Accuracy ±1% (on charging voltage over -40° to +60°C)

Power Out (+12 Terminals)

Voltage Unregulated 12 V from battery
4 A Self-Resettable Thermal Fuse Hold Current Limit
  • > 4 A (< 20°C)
  • 4.0 A (20°C)
  • 3.1 A (50°C)
  • 2.7 A (60°C)


-NOTE- At -40° to +60°C
Average Battery Voltage ±(1% of reading + 15 mV)
Average Battery/Load Current Regulator Input Voltage ±(2% of reading + 2 mA)

Impulse type changes in current may have an average current error of ±(10% of reading + 2 mA).
Solar ±(1% of reading - 0.25 V)/-(1% of reading + 1 V)

1.0 V negative offset is worst-case due to reversal protection diode on input; typical diode drop is 0.35 V.
Continuous ±(1% of reading - 0.5 V)/-(1% of reading + 2 V)

2.0 V negative offset is worst-case due to two series diodes in AC full-bridge. Typical diode drops are 0.35 each for 0.7 V total.
Charger Temperature ± 2°C


Solar Panels

SP5-L SP10 SP10R SP20 SP20R SP50-L SP90-L


PS200 Example Programs v.1.1 (36.4 KB) 12-08-2014

CR1000 programming examples for use with the PS200.  The examples show how to use both SDI-12 and RS-232 advanced instruction programming techniques.

CH200 / PS200 OS v.9 (430 KB) 05-18-2017

Execution of this download installs the CH200 / PS200 Operating System on your computer.  

Note: The Device Configuration Utility is used to upload the included operating system to the CH200 / PS200.

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Frequently Asked Questions

Number of FAQs related to PS200: 4

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  1. Battery manufacturers recommend that their batteries be charged at least once every 3 to 6 months. If an extra wall charger is available, such as a 29796, Campbell Scientific recommends keeping it continually connected to ac power.

  2. The CH200 or PS200 will pull power only from the source with the highest voltage at that moment. For example, the regulator will take the 20 W input from the 24 Vdc wall transformer rather than from the 18 V 50 W solar panel—even during the day. If the power goes out, the 50 W solar panel will charge during the day with no charging at night.

  3. Yes. A properly designed system with a PS100 or PS200 can keep a CR1000 working continuously during a short power failure. Campbell Scientific recommends, however, conducting a load analysis to determine what duration of power outage can be endured.

  4. The PS100 is a float-only charger that is limited to a 20 W solar panel and a maximum load of approximately 1 A.  

    The more advanced (and more expensive) PS200 is a multistage controller that can charge at higher rates and use larger solar panels (90 W) while delivering a maximum of approximately 4 A to the load, depending on the temperature. The PS200 is a smart charger that incorporates MPPT (maximum power point tracking) technology and can be interrogated by the datalogger to check its state, solar panel status, load currents, battery voltage, and net battery current. In this regard, the PS200 acts as a high-tech sensor, as well as a charge regulator.

    The PS100 has a temperature sensor for temperature compensation. The PS200 has a similar onboard temperature sensor, but it is more efficient and does not dissipate as much heat with a similar load. The PS200 also has a feature where an independent battery temperature measurement can be sent to the charger rather than using its onboard temperature sensor.