Simply Question

4 posts / 0 new
Last post
JF
Offline
Last seen: 9 years 6 months ago
Joined: Wednesday, January 26, 2011 - 03:40
Points: 3
Simply Question

Hi all

I have a 12v 7.2ah battery hooked up to a old 16mm projector.
This gives me the power I need but soon flatens the battery.
If I used a 12v car battery would I get a longer run time, since they have a higher a/h.

Any help appreciated

Spaceangel
Offline
Last seen: 6 months 2 weeks ago
Joined: Wednesday, July 15, 2009 - 15:49
Points: 500
Re: Simply Question

I have a 12v 7.2ah battery hooked up to a old 16mm projector.
This gives me the power I need but soon flatens the battery.
If I used a 12v car battery would I get a longer run time, since they have a higher a/h.

It is measured in AH and the bigger the battery the more ampere hours there are in it. So a big car or truck battery may have 60 to 90 AH a small alarm panel battery only has 7 to 17 AH So parallel a bunch of them or get a big Gel Cell like a Optima Yellow Top or Blue Top batteries and it can be charged a number of times. Automotive batteries can be charged maybe a dozen times and it is ruined. If you use two batteries in Parallel AH add if they are in series they remain the same but voltage will add up. So a 12 volt 20 AH battery pack using two batteries is either 12 volt 40 AH or 24 volt 20 AH.

KB1UKU

mf70
Offline
Last seen: 2 years 6 months ago
Joined: Friday, December 1, 2006 - 09:01
Points: 712
Re: Simply Question

Thanks to Peukert effect, doubling the AH capacity of the battery will much more than double the power you can get out of it. The crucial difference is

  1. AH capacity
  2. Battery design; make sure you get a "Deep cycle" battery for best life.

Mark

colin9876
Offline
Last seen: 7 years 11 months ago
Joined: Thursday, October 23, 2008 - 11:37
Points: 289
Re: Simply Question

of course, much longer, as a car battery has >50amp hours

Log in or register to post comments


Who's online

There is currently 1 user online.

  • SolarRichT

Who's new

  • SolarRichT
  • victoria098
  • PtheDude
  • Gilles
  • Pedal-Popper

Customize This