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Small sound cart: Power Distro - advice


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Good afternoon - I'm building a small sound cart set up:  Ive been talking to American Sound recordist Jim Keany

Building around the idea of been able to quickly break the bag away from the cart with minimal Fuss.

https://www.youtube.com/watch?v=-sNVnqQ8p7E (starts talking about power around 8.10)

 

As you can see my rig is a bit smaller but very similar.

 

Bag:

-An 833 (SL-2 - 2x src's - 2 x Betso Sharks) G4 Coms

 

Cart:

Icon M+ Controll Surface

Black magic Duo monitors

LED light strip

Usb Hub

 

My problem at the moment is Power distribution: It looks like Jim is using his PSC life bat - into a AR VmDbox then out to the bag and various components. 

 

I've been talking to PSC about using their Tripple play distrobox with their life battery but he replied with:
"Both the Large 4 Pin XLR and the mIni 4 Pin XLRs are wired with the pins doubled up.  Each of the mini XLR inputs on the Triple play is only good for about 7 amps, so if you want to supply more current than that, you should have a cable made that has a full size XLR 4 pin on one end and have it “Y” out to mini XLR 4 pins on the other end."

 

This leaves me a bit stumped - ive attached a block diagram of how I would like this set you to function but as is obvious by now, I'm a bit out mydepth are Power Distro.  

 

 

Thanks for your time and any suggestions are welcome

 

IMG_5579 2.JPG

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I'm sure Ron would make the cable for you. Wouldn't be too hard. you could use two pieces of  round 20AWG  2-conductor cable into a single XLR4M and one TA4 on each tail. If Ron has the pins 1+2 and 3+4 wired in parallel and you're feeding two of the inputs then in theory this kind of setup would be good for 14 amps. XLR 4--pins are rated for 10A per pin btw but if he's "doubling up" the pins then you can use it for more.

 

7 amps is kind of a lot on it's own. How much current will this rig really be pulling? The 833 and the video monitor are probably the two main concerns. Maybe 2A each? Maybe not even that much. The wireless and icon shouldn't draw that much. I'd get some kind of meter so you have a better understanding of your actual draw. If you really do need more than 7A you may be better off with a heavier-duty cart power solution.

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ahh nice - thats handy having 6 amps per output.

 

 

20 hours ago, Derek H said:

I'm sure Ron would make the cable for you. Wouldn't be too hard. you could use two pieces of  round 20AWG  2-conductor cable into a single XLR4M and one TA4 on each tail. If Ron has the pins 1+2 and 3+4 wired in parallel and you're feeding two of the inputs then in theory this kind of setup would be good for 14 amps. XLR 4--pins are rated for 10A per pin btw but if he's "doubling up" the pins then you can use it for more.

 

7 amps is kind of a lot on it's own. How much current will this rig really be pulling? The 833 and the video monitor are probably the two main concerns. Maybe 2A each? Maybe not even that much. The wireless and icon shouldn't draw that much. I'd get some kind of meter so you have a better understanding of your actual draw. If you really do need more than 7A you may be better off with a heavier-duty cart power solution.

Ive actually been speaking to Ron and he's been super helpful and essentially said the same as you here.

 

we worked out its just over 6amps total

 

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On 2/14/2021 at 12:58 AM, nevo said:

I’ve got a new psc euro life distro box here if you need one

im pulling 6.5 amps on my cart and float charge a lipo4  batts in small pelicans .... works a treat

Hi Nevo - they are a very powerful solution but they seemed to be designed for the PSC Euro carts - I’m currently building a modified ScMini - trying to keep everything in the bag (essential) and the monitors / mixer in the cart.

A4544B79-F6A7-4F06-8C00-DD3FD1723CF7.jpeg

3A5B4B74-4781-49DD-8A62-EFD6CB39DB87.png

On 2/13/2021 at 1:56 PM, Trey LaCroix said:

My small cart consists of a pelican battery and a Remote Audio Hotbox. Works fantastic!

Hi Tery- I’ve seen these and they look like a decent solution - what do you have it loaded up with if you find mine me asking.

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Is your plan to put the rack case on top of the bars, where the monitors are currently sitting? Or on the shelf? Also do you have a plan for attaching the case to the cart?

 

I'm looking at doing something similar and trying to figure it out.

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Ah, cart building.  Always a fun time for me.

 

Question.  Are you really pulling 6-7 amps of DC on such a small cart?  I never pulled more than 3A on a full-fledged feature (stage) cart with a Yammy 01V96, an inverter, a Fostex DV824, a 788T, a Mac Mini, two monitors, two Venues, two Comtek 216 transmitters, etc, etc.  What's so current hungry?

 

D.

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Some years back I was working a project where Gary Graver was the DP. I was setting up the espresso machine but the electricians blocked my access to power, telling me they were maxed out. I went over to give Gary the bad news that, due to limited power, I couldn't supply him with a cappuccino. Without missing a beat, Gary pointed to a light in the overhead grid and ordered that it be switched off to accommodate the coffee machine. A man with his priorities in order.

 

David

 

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20 hours ago, CjacksonSound said:

Hi Tery- I’ve seen these and they look like a decent solution - what do you have it loaded up with if you find mine me asking.

Currently an 833, an SL-2 with two SRCs, Blackmagic dual monitor, Icon control surface, a Zaxcom Camera Link, and a Comtek BST-75-216. Can get a whole day on it.

 

battery is on the bottom and the hot box is fastened to the cart behind the bag.

 

 

CA5E422E-D9B9-44DA-BF4C-A20DEDC02A97.jpeg

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23 hours ago, tourtelot said:

Ah, cart building.  Always a fun time for me.

 

Question.  Are you really pulling 6-7 amps of DC on such a small cart?  I never pulled more than 3A on a full-fledged feature (stage) cart with a Yammy 01V96, an inverter, a Fostex DV824, a 788T, a Mac Mini, two monitors, two Venues, two Comtek 216 transmitters, etc, etc.  What's so current hungry?

 

D.

Wow interesting -

the sound devices pulls just shy of 2 amps fully loaded with an SL2

 

the black magic pulls 2.5 amps

and the icon never pulls more than 2

9 hours ago, Trey LaCroix said:

Currently an 833, an SL-2 with two SRCs, Blackmagic dual monitor, Icon control surface, a Zaxcom Camera Link, and a Comtek BST-75-216. Can get a whole day on it.

 

battery is on the bottom and the hot box is fastened to the cart behind the bag.

 

 

CA5E422E-D9B9-44DA-BF4C-A20DEDC02A97.jpeg

This is essentially the same rig I’m Building! 
 

very interesting - it’s a shame you don’t have an idea of whats left  on your battery via monitoring.

 

what’s your block battery rated at?

 

best

craig

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