Really the important thing is not having to get out of bed to check your cells :)
That said, peltier are extremely good heaters (I would dare to say more efficient), since they have resistive (R2I) and peltier heating going for them. Peltier coolers ate less efficient than regular liquid/gas refrigeration but have 0 moving parts, are tiny, are portable etc.
--A
On Mar 28, 2014 4:09 PM, "Tom Hodder" <tom@limepepper.co.uk> wrote:
-- --On 28 March 2014 14:38, Cathal Garvey <cathalgarvey@cathalgarvey.me> wrote:
This is a cool effort; I'm tempted to knock one together, too, if
someone has a decent lead on a high-wattage solid-state relay? Could get
a cheap "cupcake" oven, set it to something not-insane, and then switch
on and off at the wall using the solid state relay; that looks like your
rig, Tom?Yeah. I got a cheapo 200W cartridge heater element off ebay, and am controlling it with PWM off the solid state relay from ebay here.Version 2 is going to have a peltier device like Averys, because despite them being inefficient, I don't think it's that important at this type of power use... and they seem safer than 240v elements.Though saying all that, these cooler-warmers range from about 10-50C and use a peltier device, and are cheapo second hand, and only about 65GBP new;They just need some brain surgery to add the PI to do the ON/OFF stuff....
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