Batteries issue - 7.2 AH & 7AH??? at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.


Reply
 
Thread Tools Search this Thread
Old January 20th, 2005, 09:46 AM   #1
Regular Crew
 
Join Date: Aug 2003
Location: BRUNEI
Posts: 108
Batteries issue - 7.2 AH & 7AH???

Battery 1
Panasonic (Matsushita)
Valve Regulated Lead Acid Battery
LC-R127CH1
(12v, 7AH/20HR)
Cycle Use: 14.5V – 14.9V
Standby Use: 13.6vV– 13.8V

Battery 2
Newmox (Smith Victor kit battery)
FNC 1272 (12V 7.2 AH)
Cycle use: 14.4-15.0 V
Floating use: 13.5-13.8V

Can anyone explain to me is this 2 batteries pack are the same type? I originally purchased Smith Victor SV950 with Newmox battery “Battery 2
“, and planning to use “Battery 1” as 2nd backup battery.

Please advice me on this matter

My Setup : Xl1s, Ma200, Smith victor SV950 lighting kit
__________________
Andrew
Andrew Kiu is offline   Reply With Quote
Old January 24th, 2005, 04:37 AM   #2
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
How are you feeding the XL1S 12v when it wants 7.2v (as in volts,
not amps!)??
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old January 24th, 2005, 05:00 AM   #3
Wrangler
 
Join Date: Oct 2003
Location: DFW area, TX
Posts: 6,108
Images: 1
Rob,

Looks like he's only powering the on camera light with 12v.

Andrew,

Yes, from the specs you provided, the two batteries are almost identical. When choosing batteries, the voltage must be the same but the capacity (amp-hours) can be different. The higer the amp-hour rating, the longer the battery will last on a single charge.

The 7AH vs. 7.2AH is pretty negligible in your case. Hope this helps.

regards,

=gb=
Greg Boston is offline   Reply With Quote
Old January 24th, 2005, 05:04 AM   #4
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
Ah, thanks for that Greg. I didn't read that into it.
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old January 24th, 2005, 05:06 AM   #5
Regular Crew
 
Join Date: Aug 2003
Location: BRUNEI
Posts: 108
7.2AH - VS. - 7.0AH

Thanks Rob,

Sorry, I dint get you, what I mean here is the 2 batteries mainly used for Smith victor SV950 lighting kit and the only differences between this 2 batteries is 7.0AH VS. 7.2AH and the Cycle Use…, so I would like to verify if I use 7.2AH/12V will it cause any damage to my SV lighting kit??? (Originally 7.0AH/12V )
__________________
Andrew
Andrew Kiu is offline   Reply With Quote
Old January 24th, 2005, 05:56 AM   #6
Regular Crew
 
Join Date: Aug 2003
Location: BRUNEI
Posts: 108
Thanks Greg!
where can i find more help/ info regarding batteries???
__________________
Andrew
Andrew Kiu is offline   Reply With Quote
Old January 24th, 2005, 06:05 AM   #7
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
If the lamp is rated at 7.0 amps this is what current it will draw
from the power source (if used at the specified voltage). So any
source of power needs to be able to AT LEAST give 7 amps. If the
battery kit gives 7.2 that's fine since it is more (giving you longer
times to run the lamp).
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old January 24th, 2005, 08:34 AM   #8
Wrangler
 
Join Date: Oct 2003
Location: DFW area, TX
Posts: 6,108
Images: 1
Andrew,

About amp-hour rating. It's pretty much what it states.

The 7.0AH battery will supply a current load of 7 amps for 1 hour (only when the battery is fairly new). The 7.2AH would supply 7.2 amps for one hour. You can determine how many amps your light will require by using the following formula.

This is how it was taught to us in college and it helps you remember if you write it down this way. We call it PIE.

_P__
I | E


where P= power in watts, I= current in amps, & E=voltage in volts.

You place your finger over the value you wish to calculate. So, Andrew, if you have a 50 watt camera light and you supply it with 12 volts, you would divide 50 by 12 to solve for I. In this case, I would be about 4.2amps. So, your camera light would run approximately 1.5 to 2.0 hours before the 7AH battery would need to be recharged.

Any textbook on basic DC circuits will provide you this information.

Good luck,

=gb=
Greg Boston is offline   Reply With Quote
Old January 24th, 2005, 08:35 AM   #9
Trustee
 
Join Date: Oct 2003
Location: Rio de Janeiro, Brasil
Posts: 1,137
Re: 7.2AH - VS. - 7.0AH

<<<-- Originally posted by Andrew Kiu : what I mean here is the 2 batteries mainly used for Smith victor SV950 lighting kit and the only differences between this 2 batteries is 7.0AH VS. 7.2AH and the Cycle Use…, so I would like to verify if I use 7.2AH/12V will it cause any damage to my SV lighting kit??? (Originally 7.0AH/12V ) -->>>


No, you will not damage your lamp, as the voltage is the same. It will only last one hour on the 7.0 Ah battery and very slightly more on the 7.2 Ah battery.

If it wasn't that the lamp life would diminish, I would leave the lamp on for an hour on the smaller battery to see how long it really lasts with full light.

It's an unusual lamp the SV950 seems to use, because if you multiply 7.0Ah x 12v = 84 watts. Can you check that on the lamp glass? How many watts does it read?


Carlos
Carlos E. Martinez is offline   Reply With Quote
Old January 24th, 2005, 09:09 AM   #10
Wrangler
 
Join Date: Oct 2003
Location: DFW area, TX
Posts: 6,108
Images: 1
According to specs on B&H site, the SV-950 comes standard with a 100watt bulb, although they list lower wattage replacement lamps as well. So Andrew, that means your lamp will consume approximately 8.3 amps and the 7.0AH or 7.2AH battery will run the lamp for less than 1 hour. It's good that you have a spare!

=gb=
Greg Boston is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 10:22 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network