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Old 7th February 2013, 05:27 AM   #41
col is offline col  Australia
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Usually, the walls of those plastic coolers (we call them Eskys here in aus ) are hollow and flimsy. One trick Iv'e used to boost insulation but which could also be used to stiffen them up is to drill holes in one layer and using an aerosol-can squirt full of expandable foam. It's a bit messy but works a treat. Best to get multiple small cans instead of one big one as that gives you fresh can nozzles.

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Old 7th February 2013, 11:55 AM   #42
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Originally Posted by m R g S r View Post
Ahh got it! I figure head unit load won't be much (I know it's still there) if I'm not using the units internal amp.
Some head units run hot, efficiency is not a factor in the design which is why they are not recommended for boominators.

The folks over at the speakerplans 12v forum go nuts on this stuff.12v Powered Systems - Speakerplans.com Forums - Page 1
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Old 8th February 2013, 03:37 PM   #43
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Any opinions on these batteries? 4 of them for $216 is do-able for me, and can fit inside the cooler walls or in the top with some sneaky configuration.


Sinopoly 40 Amp Hour Lithium Battery
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Old 8th February 2013, 09:57 PM   #44
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Originally Posted by m R g S r View Post
Any opinions on these batteries? 4 of them for $216 is do-able for me, and can fit inside the cooler walls or in the top with some sneaky configuration.


Sinopoly 40 Amp Hour Lithium Battery
I was planning to get those, but they were not available, so went with the GBS I wrote about in post #9 and #11.

They spec about the same, the Sinopoly is actually slightly better on paper.
Did pretty extensive research, no glaring examples of any bad runs of either.

Just be sure to monitor individual battery voltage initially to see that they are charging equally, and definitely get the low voltage disconnect.

Unlike SLA, which give ample warning that they are running out of juice, the LiFp04 just fall off a cliff, and the chemistry can be destroyed if they are discharged too deep.

Art
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Old 8th February 2013, 10:02 PM   #45
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Obviously similar to the ones art posted, just slightly cheaper.
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Old 8th February 2013, 10:05 PM   #46
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Any way I can get a real value of what the Amps actually pull at high volume? Besides estimating and calculation, a current clamp I'm guessing?

Also with the solar panels feeding in about 20watts +/- that should be good for average 100 watts of music, correct? (Assuming around 1/5)
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Old 8th February 2013, 10:28 PM   #47
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Originally Posted by m R g S r View Post
Any way I can get a real value of what the Amps actually pull at high volume? Besides estimating and calculation, a current clamp I'm guessing?

Also with the solar panels feeding in about 20watts +/- that should be good for average 100 watts of music, correct? (Assuming around 1/5)
The solar estimate seems low, most music has a crest factor of at least 10 dB, pink noise is 12 dB. The panel contribution may provide for 200 peak watts with the battery to even it out, but that would be full sun, so 1/5 probably would be closer to real world.
Anyway, 100 watts peak would be 8.33 peak amp draw at 12 volts with a 100% efficient amp, so peak draws of around 16 amps are probably more real world.
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Old 9th February 2013, 01:24 AM   #48
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Well the amps will pull more than 100 watts when run all out, I was just figuring 20 watts from the solar panels in full sun (which it will be used in full sun only, on bright beach days) 100 watts from the 1/5 (5x) if the Panels can do closer to 200 watts average with the batteries ill be very happy!!
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Old 9th February 2013, 01:47 AM   #49
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Originally Posted by m R g S r View Post
Well the amps will pull more than 100 watts when run all out, I was just figuring 20 watts from the solar panels in full sun (which it will be used in full sun only, on bright beach days) 100 watts from the 1/5 (5x) if the Panels can do closer to 200 watts average with the batteries ill be very happy!!
Ohhhhh I know a LITTLE about PV panels - me thinks you are being overly optimistic. For how long can you get 'full' sun? You have to re-orientate it 'every' hour. The wattage is using optimistic, as well. Plus circuit losses................
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Old 9th February 2013, 02:00 AM   #50
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For the single large panel, I had it lying on top of the old beach radio, wired directly to two 12v fans in series.
The panel ran the fans at pretty high speed when just left in the sun on top of the old radio.

These fans:
http://www.parts-express.com/pe/show...number=259-122

I figure that one plus another 12watt panel can do *roughly* 20 watts. I said I'd be very happy if it could charge the batteries enough for average 200 watts music; but I know it will be closer to charging enough for 100 watts of music.

Again this radio won't be used at full tilt all the time, but at times it will.

Last edited by m R g S r; 9th February 2013 at 02:04 AM.
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