PowerClamp & Matching Air Resistor

$ 1,299.00 NZD

The PowerClamp is a device for limiting the maximum output voltage of a PowerSpout hydro turbine, so as to protect sensitive equipment such as charge controllers or grid-tied inverters (GTIs) that are connected to it.  It is an external device, wired to the output of the turbine.  It uses PWM diversion of current to a heating load as a means to limit the voltage that is passed on.  For added security it incorporates an independent fail-safe crowbar that safely short-circuits the turbine's entire output current if the voltage climbs too high.

The primary purpose of the PowerClamp is to allow PowerSpout turbines to operate at a more appropriate (higher) voltage when connected to common MPPT and GTI equipment.  Open circuit condition is prevented by the PowerClamp's diversion load, so there is no danger of damage.

Model Turbine Design Voltage Minimum Dump Voltage Initial Dump Voltage Maximum Dump Voltage Crowbar Voltage
140V 80-100 90 105 120 140
250V 170 163 190 217 250
450-600V 270 258 300 342 400
Bespoke up to 350

Up to 500

We are in the process of updating the user manual to reflect the recent changes to this product. 

This PowerClamp has some new features:

  • Adjustable dump voltage.
  • Two aux signals (one PWM and one timer) so you can divert excess power to a useful load before dumping power.

This PowerClamp needs to be installed in an enclosure out of the weather.

The air resistor(s) which comes with the PowerClamp will need to be mounted in such a way which:

  • Protects what the resistors are mounted on from heat
  • Protects against fingers touching the terminals causing a shock hazard
  • Protects against rodents entering and nesting close to the resistors
  • Protects from water ingress/corrosion with a rainproof hood

Please read the detailed specifications and installation guide prior to purchase with your PowerSpout hydro turbine.

We have a un-edited video that shows how a PC2 can be used. We hope this helps.

Please read our higher voltage applications quide for more detailed information on this topic.