I have a PUR40E from my last boat which ran on 12V, the new boat is 24V, I am looking to use one of the Victron DC to DC converters to take the 24V down to 12V right near the watermaker
claims to use 4amps at 12V, however, I don't know if that is a nominal 12.6V, 12V even, or even at 14.4.
So two questions,
1) what is the peak amperage of the 12V unit needed to get it started
2) what is the optimal voltage for the watermaker (some of the converters can be adjusted as high as 15V)
Available units (not isolated output, those are not as efficient (these are ~92% efficient))
continuous / peak / voltage
5A / 5A / 12.0V
12A / 20A / 12.0V
17A / 25A / 12.0V
25A / 35A / 10V - 15V
40A / 55A / 12.0V
70A / 85A / 10V - 15V
My guess is that the 12A / 20A version would be quite sufficient although the 17A / 25A is almost the same price
The 25A / 35A version would allow boosting the voltage up to normal charging
voltage of 13.6A and provide a backup for the SSB
converter although I will probably use an isolated version for the SSB
I may have to go and drag out a scope
and look at the inrush to see what is happening and remembering the sound of the unit I doubt that the 4A is truely continuous.
If anyone has looked at this or has thoughts I would most appreciate the feedback!