jawharp Posted April 10, 2014 Report Share Posted April 10, 2014 Hey Guys, Doing a car scene tomorrow and I'll be mixing from a follow van. I was thinking of powering my venue system off of my IDX Lithium Ion NP-L7S batteries. It's a regular rack mount venue system, not a VR Field if that makes a difference power wise. We should be in that car for a couple hours. I was wondering if anyone had done this before and knows what kind of runtime to expect from each battery. Thanks, Joe Quote Link to comment Share on other sites More sharing options...
RPSharman Posted April 10, 2014 Report Share Posted April 10, 2014 They use about 1.3 amps at 14v. The battery is 14v 4.6aH. So, I'd guess "a couple of hours" would be ok. If that gets closer to 3 hours, give or take, you'd be getting dangerous. Others here have better knowledge of this stuff, but it's how I understand it. Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted April 10, 2014 Report Share Posted April 10, 2014 4.6 divided by 1.3 equals about 3.5 (hours, in this case). YMMV due to several factors, but basic math will get you pretty close. Quote Link to comment Share on other sites More sharing options...
BAB414 Posted April 10, 2014 Report Share Posted April 10, 2014 Really basic question but how does the math work out if the battery voltage differs from what the gear requires? For example if the fully charged battery metered in at say 16volts in the above example. Is it (16/14) x (4.6/1.3) = 4.04 hours? Sent from my Nexus 5 using Tapatalk Quote Link to comment Share on other sites More sharing options...
RPSharman Posted April 10, 2014 Report Share Posted April 10, 2014 Your math seems logical, but keep in mind that batteries don't stay at 16v, and environmental conditions and cabling and age of battery, etc., all affect performance. Quote Link to comment Share on other sites More sharing options...
BAB414 Posted April 10, 2014 Report Share Posted April 10, 2014 Thanks Robert! Sent from my Nexus 5 using Tapatalk Quote Link to comment Share on other sites More sharing options...
JonG Posted April 10, 2014 Report Share Posted April 10, 2014 I use a Sound Guys Solutions double NP cup and one of their BDS systems as a makeshift cart power setup powering a Venue, SD 302, and a Lectro um100. I get about 7 hours off of two IDX NPL7Ss. You can see my configuration under the rats nest of cables below: Quote Link to comment Share on other sites More sharing options...
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