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I power my TIU with two 180 bricks. On my variable channels I only get 3.5 to 4 volts less output than on my remote. Dialing up 20 volts on remote I get around 15 volt output on TIU. So that's maximum output on both my variable channels. Shouldn't I be able to get 0-18 volts if my input is 18 volts?

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I get a drop of around half a volt through the TIU from my PH180 with a 2 amp load on the TIU output.  With no load, I see virtually the same voltage, within .1 volts.

That being said, you're not looking at this in the correct way.  The TIU "assumes" 22 volts on the input, and so it's output voltage reading on your remote is based on the 22 volt input.  Since the PH180 only gives 18 volts, you get the ratio of 18V to 22V, that's about 20% lower.  So, if you dial up 20 volts on your remote, you are actually getting 80% of 20 volts because of the assumed input voltage vs the actual input voltage.  20 volts on the remote equals around 16V on the output of the TIU when powered with the PH180.

If you set the output at 18V, that's correct.  The remote is just showing you a ratio of the input fixed voltage (assumed to be 22 volts), and the output throttle setting.  It's not measuring the actual voltage, so unless you have 22 volts going in, it's not going to be accurate.

Thanks. Actually my input from bricks is a bit under 18 when I put my meter on it. Output is 14.6 volts.

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