We carry all AERL Cathodic Protection Controls and accessories. Currently 15 amp and 30 amp impressed current CP controllers are available.
Why use AERL CP controllers in a solar powered cathodic protection system?
There are few other - if any - CP controls that are actually designed for use with solar electric powered cathodic protection systems. Nearly all standard CP current controls are designed for systems where AC power is available, and efficiency is seldom considered. While several controllers are sold or advertised as cathodic protection controllers (often erroneously called "rectifiers" - nothing is rectified, it is all DC). Other than the AERL CP controllers, we are not aware of any other controllers that are specifically designed for maximum efficiency.
But if you or your customer is paying for the solar and battery system using one of those "other" controls, it could be costing you from 200% to 500% too much. Standard CP controls are normally very inefficient at stepping down the voltage and current from the power source. They basically just limit the amount of current to a set amount (or based off of a reference cell). This can involve huge losses when used with a photovoltaic/battery based system, with the majority of the losses going to heat.
The AERL CP controls use an advanced system to directly convert the battery voltage and current to what is needed to drive the CP anodes at a constant current. Both the 15 amp and 30 amp models will convert voltage and current at a 97% efficiency.
For example, if you need 9 volts to drive 6 amps into the ground bed, the AERL controller will convert a 24 volt battery down to that. The controller will draw (54 watts/24 volts) 2.25 amps from the battery.
This improves efficiency tremendously - and also reduces the cost of the PV module + battery system, in some cases by as much as 90%.