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Power supplies·2026 · OCT
Isolated outputs2000mA DC9V · 12V · 18V

01Harley Benton · jack-by-jack math

How many pedals can the Harley Benton PowerPlant ISO-2 Pro power?

8 isolated outputs and 2000mA of DC, checked jack by jack against 211 pedals at their own voltage.

Plan a board on the Harley Benton PowerPlant ISO-2 Pro

02The short answer

Up to 8 pedals, one per output, from 2000mA of DC.

Built for: A budget eight-pedal board of 9V pedals up to 300mA, with two jacks that switch to 12V or 18V for the pedals that need them.

  • 190 of the 205 powered pedals in our database run on any jack here at their voltage, even its smallest (300mA at 9V).
  • 11 need one of its larger jacks, up to 500mA at 9V.
  • Every powered pedal in the database has a jack here that carries it.
  • 4 pedals have no published draw: read the figure off the label and the calculator finds the jack that carries it.
  • 4 passive volume pedals take no jack at all.
  • The Eventide H90 Harmonizer runs from its own 12V adapter, off the supply.
  • The Electro-Harmonix Deluxe Memory Man runs from its own 24V adapter, off the supply.

03The jacks

Per-jack ratings as the manufacturer publishes them. A jack carries a pedal when it offers the pedal's voltage and its rating at that voltage is at or above the pedal's draw.

OutputJacksVoltagemA per jackPedals each jack carries
Jacks A-B29V / 12V / 18V500mA201 of 201
Jacks 3-869V300mA185 of 201
Total DC82000mA

Every output section is isolated, so a digital pedal on one jack does not share a ground with the pedal next to it. “Pedals each jack carries” counts the 201 powered pedals in our database with a published draw, each at its own voltage. Pedal figures are typical published draws; check each pedal’s label for its voltage and polarity before you plug in.

04Where the big pedals go

The pedals in our database that need more than its smallest jack at their voltage, highest draw first.

Needs a larger jack · 11

05A real board on it

The calculator's example board (a tuner, a compressor, an overdrive, a distortion, a delay and a reverb), run on this supply.

Runs clean

Draw
293mA
Available
2000mA
Headroom
1707mA
Outputs
6 of 8

Open it in the calculator

Source

Per-jack ratings transcribed from Harley Benton’s published spec. Outputs A and B switch between 9V, 12V and 18V at up to 500mA each; outputs 3 to 8 are 9V at 300mA. Harley Benton caps the total load at 18W, which is 2000mA at 9V, so the eight jacks cannot all run flat out at once. Harley Benton spec page.

Checked against that page on October 15, 2026.

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