This design is a battery charger/discharger and the discharge portion=20 of the device will dissipate around 100W-120W with both channels on. It is designed to give a measure of capacity of battery packs. The users expect it to handle a relatively high amount of power. It's not even close to green. :-) Mark Skeels Engineer Competition Electronics, Inc. TEL: 815-874-8001 FAX: 815-874-8181 www.competitionelectronics.com On 9/15/2010 10:16 AM, Forrest Christian wrote: > In this day and age, I would think quite a few times about anything > which dissipates any amount of heat, since heat is generally a > indication that the design isn't very green, which isn't very popular > nowadays. > > Unless you have a good reason for it, and can explain it in a way that > makes sense, I would avoid anything which gets much above ambient. And > by 'explain', things like my motorola droid which gets hot when charging > plus navigating plus setting in the sun on my dash makes sense. Or say > if you were doing something very computing intensive and it gets hot > when you do that - I.E. heat from heavy work is acceptable, heat when > idle or under simple tasks is not. > > -forrest > > On 9/15/10 7:51 AM, Mark E. Skeels wrote: >> I am working on a consumer product that will be used by people >> generally a bit more technically oriented than your average person. >> >> It dissipates a fair amount of power at times and so it can generate a >> fair amount of heat. >> >> It will be used in a residential, indoors environment......on a table or >> a bench. >> >> My question is this: What is a reasonable/acceptable upper limit for >> maximum exterior surface temperature given these circumstances? >> >> Is there an accepted specification(s) for something like this? >> >> I am thinking maybe 60 deg C........? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .