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Unique alternative

The PADCON Float Controller offers a unique alternative. It allows the operation of an ungrounded system and simultaneously fights the PID-effect.

Technically, this is realised by actively raising the positive potential. Based on the fact that the modules can no longer see a negative voltage, PID-impaired modules regenerate and are protected in the future.

Until now there was only one solution existing on the market to reduce the PID effect in non-earthed systems. This is based on a single-sided earthing of the system, which entails significant disadvantages. The construction costs of a non-earthed system are substantially cheaper and the system safety is simultaneously higher. Furthermore, this operating mode also has the advantage of detecting creeping earth faults in good time and the PV system remains functionally capable with a single-side earth fault.

Thanks to this single-fault tolerance, the PV system creates a higher yield than an earthed system, whereby the earth short-circuit results in an immediate yield loss.

The PADCON Float Controller can be installed both in new systems and also in existing systems. The product range offers an appropriate solution for all types of inverters.

Modulde degradation by PID – Solution (s) ?




PADCON Float Controller

Instant PID protection



Easy to retrofit


Inverter independent


One-error tolerance  

String inverters


Central inverters



Your benefits at a glance

  • Quick regeneration of PID affected modules

  • Solutions for string & central inverters

  • Increasing module lifetime

  • Instant protection against PID

  • Yield increase

  • Easy to retrofit

Operation Mode

Operation Mode NIGHT (Float Controller CI & SI)
PID Operation Mode NIGHT (Float Controller CI & SI)

As soon as the generator voltage drops below a defined threshold value in the evening, the Float Controller raises the PV field to a high, positive potential thus reversing the polarisation effect that arises during operation. When the generator voltage rises again over a defined threshold value in the morning, the Float Controller automatically switches to standby mode. Both the threshold values and the maximum output voltage can be individually adapted to suit the system in question.

Operation Mode DAY (Float Controller CI)
PID Operation Mode DAY (Float Controller CI)

For systems with thin-layer modules, the Float Controller CI also offers the facility of daytime operation. Because TCO corrosion is a non-reversible effect, this must be prevented during the operation of the system. By raising the positive potential to <1000V, the modules have no negative potential relative to earth during operation and are therefore in a permanently safe condition.