|
Hi Leon,
Do you mean a Canon DSLR dummy battery?
If I read understand correctly:
1. You have a longer 240v lead running out to a small DC power pack/converter.
2. The power pack/converter says 7V / 2 amps.
3. The DC output of the converter pack goes into the dummy battery via it's own short lead.
The 2 amps on the power pack is a maximum output at 7V. Your camera won't draw anything like 2 amps. If it did, the standalone lithium battery when used wouldn't last more than 40 mins. Even if it was 2A @12V, that is only 160mA at 240v. But it won't be, 2A. It will be a small fraction of that.
So, at that tiny current drain, you can safely use any length of 240V lead, even 2 x 25m=50m is ok, out to the power pack, no need to calculate or stress. Don't extend the power pack lead.
Cheers
Joe
|