Hi Aaron,
Sounds like you are moving up from One Minute Vacations to One Day Vacation=
s:) I was just thinking about a similar project last night.
Of course rechargeables are more cost effective and eco-friendly for long t=
erm projects, but if you do not plan to need this on a regular basis consid=
er disposable alkaline D-cells. Walgreens drug store often has sales on th=
eir house brand for $8 for a dozen.
Shoot for higher in the (9-18v)voltage range. A 12 D-alkaline pack will pro=
vide 18v under load: I must warn however, the initial spike of ~ 20v could =
be harmful. Could run it down a bit first, or otherwise a 16.5 pack. That m=
ight be ideal: two parallel packs of eleven D-alkaline might provide the 28=
hours you are going for.
I have been using plastic battery holders for this: I tape them up well so =
the batteries cant move.
That does seem like a lot of battery waste though, doesn't it? Especially s=
ince you would want to test it at least once, or twice.
Do not rely on the battery switchover feature of your 7xx, as it may not be=
reliable.
I don't know of commercially available power cords, but you could get one c=
ustom built. Attaching the 4-pin hirose is the hardest part. You could make=
it a much easier job by using the cable from a SD power supply and solderi=
ng on the necessary connector. I have been using Tamiya style connectors to=
switch between power supply, battery packs, and car lighter adapter.
John Hartog
--- In Aaron Ximm <> wrote:
>
> Hi,
>
> Can anyone give me the quick run down on what's needed to run a Sound
> Devices 7 series recorder off a 12V (?) lead acid battery?
>
> I need to do some uninterrupted recording on the order of 24-28 hours,
> two channel, probably 24/44, with a 722, providing phantom on both
> channels. As are as I can tell I will need a pretty beefy battery --
> anyone have field experience on what I really need? I was thinking a
> 26Ah battery would be conservative. Not to mention ridiculously heavy,
> but I don't need to transport it into the back country, so that's OK.
>
> My specific questions are:
>
> Any guesses on the capacity I should really pursue?
>
> Is there a commercially available power cable adapter that terminates
> in the appropriate connector for the 7 series recorders, and has
> spades on the other end for batteries?
>
> Do I need a lead acid battery charger? I have a lead on some very
> affordable ones, but is this a must- or a nice-to- have?
>
> Any tips/pointers much appreciated. :D
>
> Thanks,
> aaron
>
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>
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