Lots depends on enclosure and its size. For heat dissipation you usually size them larger. You could size smaller and depending what device is inside my supply some heat. Enclosure heaters start at around 25.00 at Automation Direct fyi
Jaime Solorza On May 18, 2015 8:34 PM, "Adam Moffett" <[email protected]> wrote: > The danger you have to consider is a cold start, such as if the power was > off for awhile. > > On 5/18/2015 10:32 PM, George Skorup wrote: > > This winter was pretty cold. For about a week straight in the middle of > January and again in February, I had a few base units reporting under 0F > every night. And I know the outside air temp was -20 to -25F. Obviously > take the base unit's temp reading with a grain of salt because it's clearly > generating some internal heat. I would bet inside the enclosures it was > easily -15F. But I think your -13F is probably OK. > > On 5/18/2015 9:09 PM, Forrest Christian (List Account) wrote: > > What is the lowest temperature that each of you would normally expect > to see in your enclosures? > > The reason I'm asking is that I'm in the process of developing up a few > new products. > > To date, all of the packetflux products are designed with components > rated -40 to +85C (I.E way cold to way hot). I'd like to retain this > rating, but I'm running into a minor snag: > > For storage, I'm planning on integrating a SD card (probably microSD) in > a socket. I only need a GB or so, and SD card memory is inexpensive at > that range. > > Unfortunately, all the reasonably priced SD cards are only rated down to > about -25C or -13F. which are about ~$3 in qty. "Industrial temperature > range" ones which are good down to -40C/F are available but they add at > least $30 to the cost for non-name brand, and even more for known brands. > When you're talking about a $100 end-user price, a $30 1GB SD card seems > excessive - and probably isn't even possible if I want to meet the $100 > price with some margin. > > So, I'm currently playing the 'what options do I have' game. I hate to > ship a product only rated down to -25C/-13F, but I know for at least a > large chunk of my customer base they never see below this temperature, > especially when you add a watt of power dissipation in the case with the > device. Which leads me back to my original question: What's the lowest > temperature most people would expect to see inside their enclosures. > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com > <http://www.linkedin.com/in/fwchristian> > <http://facebook.com/packetflux> <http://twitter.com/@packetflux> > > > >
