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Offline Big Perm

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battery solutions for sd788
« on: October 31, 2011, 12:19:55 AM »
did i really miss it, or is there nothing in this section about this.
Whats the best solution for a 788. I have the battery from my 744 but i wonder about how much more power the 788 pulls
Mics: Schoeps mk22>kcy>vst62iu
         Schoeps mk5> KC5> CMC6Ug
         Schoeps CCM 41V, Neumann TLM 107
Pre’s: Sonosax SX-M2D2; Aeta PSP-3, E.A.A. PSP-2,
         Neve Portico 5012, Oade m248
Recorder: SD788t, SDMixPre-10t, SD702, Sony m10

Offline page

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Re: battery solutions for sd788
« Reply #1 on: October 31, 2011, 12:47:45 AM »
did i really miss it, or is there nothing in this section about this.
Whats the best solution for a 788. I have the battery from my 744 but i wonder about how much more power the 788 pulls

the bottom batteries for the 744 work on the 788 but you need an external battery (e.g. a tekkeon) to start the unit; too much draw for the Sony camera batteries and they trip a circuit breaker of sorts. SD is aware of the flaw.

It's also probably not advisable to leave P48 on for all channels and try and start it. That whooshing sound is your battery gasping as the surge of current is drawn on start up... :lol:
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline sunset

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Re: battery solutions for sd788
« Reply #2 on: November 01, 2011, 11:30:58 AM »
 On the right hand side of the unit,there is a Hirose 4-pin DC in plug.This is the power "in" plug you want to use,you'll need to custom splice a cable(Ted could probably help you out) from the 7xx(Hirose 4-pin) to your battery.I used the Tekkeon extended batteries for awhile but now I use the Battery Geek batteries.The Tekkeons would cut off on me every now and then,so I switched to the Battery Geeks and have had good luck with  them.Enjoy your new tool.

Offline page

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Re: battery solutions for sd788
« Reply #3 on: November 01, 2011, 02:14:21 PM »
On the right hand side of the unit,there is a Hirose 4-pin DC in plug.This is the power "in" plug you want to use,you'll need to custom splice a cable(Ted could probably help you out) from the 7xx(Hirose 4-pin) to your battery.I used the Tekkeon extended batteries for awhile but now I use the Battery Geek batteries.The Tekkeons would cut off on me every now and then,so I switched to the Battery Geeks and have had good luck with  them.Enjoy your new tool.

I had Ted do a tekkeon>hirose cable for me that I've used and I've had great luck with it on two conditions; I have to calculate the capacity as the LEDs on mine lie, and I have to bump the voltage up by at least half a volt above what the minimum is. I've found that many tekkeon units when set to X actually sag a bit under load, so a 10v setting actually puts out anywhere from 9.2 to 9.9 or 10v true based on the SD battery meter (averaging 0.3v off in my experience). The more the draw, the further it seems to sag, at least for the first 15 minutes or so (I quit checking after that until I was done a show). So I run mine at 11v or 12v instead of 10v as a result.
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline NOLAfishwater

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Re: battery solutions for sd788
« Reply #4 on: November 01, 2011, 05:22:04 PM »
for the price of $200 it blows everything else out the water:

http://www.bixnet.com/unpowbat.html

153Whours

Offline hi and lo

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Re: battery solutions for sd788
« Reply #5 on: November 01, 2011, 06:28:56 PM »
for the price of $200 it blows everything else out the water:

http://www.bixnet.com/unpowbat.html

153Whours

nice find!

Offline acidjack

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Re: battery solutions for sd788
« Reply #6 on: November 02, 2011, 12:37:08 PM »
^^ Yes... appears that, like a Tekkeon, you could run both a deck and the USBpre2 off the same batt... hmm.
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Offline NOLAfishwater

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Re: battery solutions for sd788
« Reply #7 on: November 02, 2011, 03:38:17 PM »
did i really miss it, or is there nothing in this section about this.
Whats the best solution for a 788. I have the battery from my 744 but i wonder about how much more power the 788 pulls

the bottom batteries for the 744 work on the 788 but you need an external battery (e.g. a tekkeon) to start the unit; too much draw for the Sony camera batteries and they trip a circuit breaker of sorts. SD is aware of the flaw.

It's also probably not advisable to leave P48 on for all channels and try and start it. That whooshing sound is your battery gasping as the surge of current is drawn on start up... :lol:

http://www.sounddevices.com/notes/recorders/lion-batteries/

here is some info on the power consumption:
http://www.sounddevices.com/notes/recorders/powering/power-draw/
« Last Edit: November 02, 2011, 03:40:46 PM by NOLAfishwater »

Offline Big Perm

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Re: battery solutions for sd788
« Reply #8 on: November 02, 2011, 08:55:49 PM »
Thanks Louis, however those damn power consumption charts just confuse the hell out of me... I have one of those double tekkeons, the one with the extended power blah blah blah....i think that should work...hoping  ???
a
Mics: Schoeps mk22>kcy>vst62iu
         Schoeps mk5> KC5> CMC6Ug
         Schoeps CCM 41V, Neumann TLM 107
Pre’s: Sonosax SX-M2D2; Aeta PSP-3, E.A.A. PSP-2,
         Neve Portico 5012, Oade m248
Recorder: SD788t, SDMixPre-10t, SD702, Sony m10

Offline NOLAfishwater

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Re: battery solutions for sd788
« Reply #9 on: November 02, 2011, 09:54:31 PM »
the draw of the unit also depends on the draw of the mics. looks like your mics only draw 100mA each of the 4 mics so that is a total of 400mA

http://digital.schoeps.de/en/products/cmd2

based on the 788t draw which is found here: http://www.sounddevices.com/notes/recorders/ssd-current-draw/

It draws 1.15A  when Recording (24-bit, 48 kHz, 8-track) + mic draw 400mA (or .4A) = 1.55A

so the chart was based off 13V DC power so 13V x 1.55A = 20.15 Watts per hour



Also, other 788T usage factors have larger affect on power consumption and battery runtime, including:

    Inputs – active inputs increase power consumption. If recording solely to one or two inputs, disable unused inputs to reduce power consumption. Analog inputs and their microphone preamps draw current whether they are idle or active. Inputs draw 1.5 W versus to deactivated inputs.<<< so for every channel deactivated you get that much more run time
    Drive Activity – when the unit is recording to or playing back from the internal drive, power consumption raises by approximately 2 W. Recording to CF only reduces power consumption.
    Microphone Powering -  phantom powered microphones draw power for operation. Up to 4 W can be drawn from the phantom supply. <<< we already determined the consumption of the mics with 13V DC  as .4 amps or 5.2 Watts for all 4 mics being powered, which is great.




now to your batteries:  Tekkeon 3450  specs found here: http://www.tekkeon.com/downloads/dtasht_MP3450.pdf

each is equal to 50Wh, the piggy back is 58Wh so, paired together you get 108Wh


The 788 draws 20.15 Watt per hour so divide the dual Tekekon108Wh capacity by 20.15 = 5.35hours x 70% efficiency = ~3.74 hours

remember if you record to the internal hard drive or run your LED's/Backlight bright, this will also cut down on the run time.

If it were me, I would buy this 300 Watt Hour battery for $400  http://www.bixnet.com/bp300.html 70%eff = 10.42 hours run time
in regards to it needing to jumpstart the 788:
Continuous Discharge Current 12 A <<this is the max that you can pull at one time continuously



or I would at least get the 153 Watt Hour battery for $200 http://www.bixnet.com/unpowbat.html  70%eff = 5.31 hours run time
Continuous Discharge Current  is 4.75A  <<this is the max that you can pull at one time continuously



Someone please correct me if I am wrong, as I am not an electrical engineer

Offline notlance

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Re: battery solutions for sd788
« Reply #10 on: November 03, 2011, 12:01:44 AM »
the bottom batteries for the 744 work on the 788 but you need an external battery (e.g. a tekkeon) to start the unit; too much draw for the Sony camera batteries and they trip a circuit breaker of sorts. SD is aware of the flaw.

This is the first time I have heard of this problem.  I am not saying it does not happen to somebody else, but I have run my 788T for several years with various "internal" Li-Ion batteries (including Sony) without having any start up issues.

Offline notlance

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Re: battery solutions for sd788
« Reply #11 on: November 03, 2011, 12:13:34 AM »
I have run tests on a 788T and have found the LEDs draw very little power so whether or not they are on has little effect on battery run time.

Also, the HD draws surprisingly little power.  The slightly extra power used when recording to HD and CF is worth it to me for the redundancy.  Dual media is one of the great features you are paying extra for with a SD box so it would be a shame not to use it just to save a little bit of power.

It is worthwhile to turn off unused inputs.


Offline Big Perm

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Re: battery solutions for sd788
« Reply #12 on: November 03, 2011, 12:17:32 AM »
the bottom batteries for the 744 work on the 788 but you need an external battery (e.g. a tekkeon) to start the unit; too much draw for the Sony camera batteries and they trip a circuit breaker of sorts. SD is aware of the flaw.

This is the first time I have heard of this problem.  I am not saying it does not happen to somebody else, but I have run my 788T for several years with various "internal" Li-Ion batteries (including Sony) without having any start up issues.

So do you use an external battery at all? If so what, and which lion "internal" do you use?
Mics: Schoeps mk22>kcy>vst62iu
         Schoeps mk5> KC5> CMC6Ug
         Schoeps CCM 41V, Neumann TLM 107
Pre’s: Sonosax SX-M2D2; Aeta PSP-3, E.A.A. PSP-2,
         Neve Portico 5012, Oade m248
Recorder: SD788t, SDMixPre-10t, SD702, Sony m10

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Re: battery solutions for sd788
« Reply #13 on: November 03, 2011, 12:35:34 AM »
the bottom batteries for the 744 work on the 788 but you need an external battery (e.g. a tekkeon) to start the unit; too much draw for the Sony camera batteries and they trip a circuit breaker of sorts. SD is aware of the flaw.

This is the first time I have heard of this problem.  I am not saying it does not happen to somebody else, but I have run my 788T for several years with various "internal" Li-Ion batteries (including Sony) without having any start up issues.

DrFob and a guy from San Francisco named Matt will be happy to tell you their inner most feelings about it.  :D Up until you said something, I'd never met anyone who had gotten a standard 7.2v lion to work with it for starting.

http://www.sounddevices.com/notes/recorders/lion-batteries/

Thanks, I was busy this afternoon and didn't look but knew the bulletin was out there. +T
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline F.O.Bean

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Re: battery solutions for sd788
« Reply #14 on: November 03, 2011, 01:05:55 AM »
You could get a Sony DK-415 Dummy Cell and wire any battery your heart desires ;)m Or just stick w the old reliable 12v SLA's :P ;D
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