Best location for monitoring voltage

[MtnGoatXJ]

Currently my voltmeter is across the battery.
would it be best to measure voltage across the reactor instead?

[BioFarmer93]

Huh..
I never thought about it, I just automatically put it across the reactor thinking (perhaps erroneously) that it was the thing that needed its voltage measured. Good question.. Anyone else?

[myoldyourgold]

It all depends of what information you want. Do you want the voltage of the battery or do you want the voltage at the reactor. I am with you Bio and use the voltage across the reactor because that is what is relevant to the HHO system. A lot of cars have there own battery voltage meters measuring the battery voltage so no use adding another one.

[MtnGoatXJ]

That's what I needed guys.

Again, many thanks for your time!

[D.O.G]

[QUOTE=myoldyourgold;46088]It all depends of what information you want. Do you want the voltage of the battery or do you want the voltage at the reactor. [QUOTE]

As the circuit is drawn (no PWM), there will only be a slight difference between battery voltage and reactor voltage, due to the ammeter (and maybe some loss in the wires).
If a PWM is used, a voltmeter across the reactor displays the average voltage of the pulses, which will be much less than battery voltage.