What are the major differences between a PS100 and a PS200?

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 data logger 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.

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