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Because of 4QD's designs, most of our controllers can be made in 48v versions. This generally involves upgrading several components to higher voltage devices and the use or higher voltage MOSFETs and capacitors, as well as increasing the overvoltage clamping.

Modifying individual controllers is not commercially viable, and the demand for 48v versions is generally low, so only certain models are generally available as -48 versions.

Operation above 48v

However the maximum safe working voltage of the capacitors in 48v models is 62v and this should not be exceeded for any significant time or the capacitors will overheat and explode. One of the reasons why we don't make higher voltage controllers is that the next voltage capacitors (100v) are of significantly lower capacitance in the same can size, so most controllers would need a lot more capacitors. That generally means a complete redesign.

Available 48v controllers

• 4QD series
  these are wide operating voltage range: the -48 version will work between 18v and 60v max
  • 4QD-200-48
  • 4QD-300-48
• Pro-120
  • Pro-120-48. This is no longer available as the standard Pro-150 does the job - a better controller at the same price.
• Pro-150 is a wide voltage range programmable controller working from 18v to 60v.
• Uni series
  • Uni-4-48
  • Uni-8-48
• Porter controller
  • Ptr-040-48 is a wide voltage range controller working from 12v to 60v. Currently (Jan 2010) not a stock item so available to quantity order only.

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