On Friday, 4 May 2018 15:46:37 UTC+1, ARW wrote:
Just fitted my first ever voltage optimiser.

Not much to it but I am puzzled.

I tapped of the 10% drop terminals. The incoming supply to the optimiser
is 251V and the outgoing load is 236V.

So where does the 10% come into this?


For a pure resistive load, the "power saving" will be the ratio of
the squares of the voltages, so it is fairly close to 10% for
those voltages.

Whether enough of the load is resistive and not constant power
(switch-mode) or thermostat controlled for this device to be
useful is another matter.

John