accsys wrote:
Since you have access to the input wiring you could use an ammeter to measure the current draw and then double it since you will doubling the voltage.
Fans are not purely resistive loads, so this isn't all that precise. It would give a rough estimate at least. The startup current draw for the fans is likely a little higher than their running current, maybe quite a bit higher; rounding up in the current requirement would be a decent idea.
If one gets a variable boost supply, the fan speed could presumably be controllable, which might be handy.
