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Help needed for outdoor stereo with no electricity

We have a family lake picnic pavilion about 2 miles from the nearest power pole. I'm no electrical engineer and could use some help.

-for power I have
Sealed Deep-Cycle Interstate battery
12V 33AH
@20 hour rate to 1.75VPC and 77deg. Farenheit


-to convert to AC I have a 300 watt DC to AC power inverter
it has two AC outlets

-for a source I plan to use my Apple Ipod
it is powered by its own battery

I would like to use a standard 30 watt/ channel stereo receiver to power some box speakers.

Will this work?
Could it play for 3 or 4 hours at normal listening levels?
holzhauer
swampwalker's avatar
swampwalker
5,138 posts
 
If you got some hi-eff horns, you could use a micro-Zotl as an amp. It is set up to run on DC battery power with a flick of a switch.
holzhauer OP
201 posts
 
I was thinking of high efficiency horns as a way to save power and fill the outdoors with sound. The Berning is a mouth watering temptation. Probably more than I want to spend however. Just learned Berning designed a tube amp for the car. That's pretty cool.
elwood
42 posts
 
how about a simple portable generator for the power for the subwoofer you will need to fill the open soundstage.
gs5556
1,209 posts
 
Here's the math for a 12 Volt DC battery @ 33 ampere-hour:

If the power draw is:
30 watts - 10 hrs run time
60 watts - 5 hrs
120 watts - 2.5 hrs
240 watts - 75 minutes
300 watts - 1 hr

I rounded off, the actual times are a little more.
holzhauer OP
201 posts
 
Thanks for all the help. It looks like going with low power and high efficiency would be in order.
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