Thanks for pointing me to this thread Drew. I just read through it and have some comments to post.
I have worked in electronics including product design since the early 1980s. My company designed and manufactured electronic computer products successfully for a number of years before I became an ISP. Some of the designs were my own and I was involved in all of the designs.
Before we jump the gun and blame the power supply, lets look at a couple of facts.
1) Metarouter appears to have some stability issues. We are not sure if it is version specific or environment specific but the complaints in this thread all relate to running an application in metarouter under various ROS versions with various amounts of RAM, and on various RouterBoards.
2) While it doesn't appear to be a cure, there have been some differences noticed in the frequency of the crash when changing to various voltage power supplies.
3) This thread was originally opened as a question about the RB450G with Metarouter but has spanned several routerboards including RB450G, RB750, RB433, and RB493. I am going to stay focused on just the RB450G as it has enough RAM and CPU power to handle most virtual applications. Some of the others mentioned do not.
Problem #1 looks like software or resource problem. I think the focus of this problem should remain there.
I have a problem with fact #2. The RB450G and most of the RouterBoards from the past two years (and all RB4xx boards) use the same power supply circuit. They use a Richtek RT9206 power controller which takes 4.75 to 28vdc in and puts out 3.3vdc.
I found the data sheet here: http://www.cheertech.com.tw/RichTek%20C ... 206-09.pdf
This should remain the same whether we are feeding it 12vdc or 24vdc. The power capacity only needs to be sufficient to run the RB450G at full load. I suspect that would be about 3 watts since that is what the RB493AH is supposed to use. The RB450G has 4 fewer ports but Gigabit ethernet instead of 10/100. I call that an equal power tradeoff. Any power supply from 8vdc to 28vdc with at least 3 watts of capacity should work fine to power it.
<putting on my Mikrotik distributor hat> The 18POW is one of our best selling products. We have sold about 800 RB450G-complete (with case and power supply) this year that included the 24volt, 19 watt 18POW. We are only one of the 12 US Mikrotik distributors and there are many other Mikrotik distributors around the world. That means many thousands of these have been sold and deployed.
We have been selling these since the beginning of 2009. This is the first that I have heard of a stability problem with the RB450G and 18POW supply and most of my RB450G customers are using that combination.
The missing part in the failure discussed in this thread is Metarouter with operwrt running a script or application.
Again, I am thinking.... software problem.
Sorry to bore you with my opinion but I think this thread needed some new blood.