Endothermic cooling

[nigelmercier]

So a cool box with a pelt ire cooler powered by a solar panel...

Not directly you can't, it probably draws about 12A.

 

[Boreades]

Not directly you can't, it probably draws about 12A.

I'm interested where the 12A figure might come from

At rated capacity (100W) and regulated to (say) 12.8V (just checked on one of my solar panels),
that is P = VI , I = 100/12.8 = 7.8A

Alternatively, with an internal resistance of "Ohm:1.3 - 1.5", (say 1.4)
V = IR, I = V/R = 12.8 / 1.4 = 9.1A

 

[nigelmercier]

I'm interested where the 12A figure might come from...

From the datasheet of a similar item. AIUI the 100W is the cooling power, not the electrical power.

 

[Vara]

A terracotta flower pot, bottom hole blocked filled with water and beer...in cans or bottles, lid over top provides a marked cooling effect if kept out of sun and subject to some air movement.

Some of the better canvas buckets, the ones with seams that don't leak work as well.

Old style army water bottles had a felt covering which was dampened and cooled the contents.

I don't care how many statistics are bandied about, the peltier gadgets and cool boxes are pretty useless and too power hungry for a small boat.

 

[Stoaty]

Yo. You're getting the idea. No fridge, the ice is long melted, at anchor, the sun is out.... ..... Just wanna cool a beer, or chill the the cold box to keep food fresh a bit longer. No -70 degrees man, just chill it Must be food safe, safe to carry aboard, legal, and easily available when in port. No urea, no poisons, just safe easy coolin man. And not damaging to the earth, sea, wildlife I'm out there to enjoy.

Come on forumites, you can do better with ths science project I know....

You just need a CO2 extinguisher.