[arm-allstar] Pi3B vs Pi2B temperatures

[David McGough]

Sam,

This is typical behavior, in my experience. The RPi3B and later boards do 
use more power and dissipate more heat.

The heatsinks help, but without air flow, they mostly add "thermal mass"
to the SoC. This reduces any rapid temperature changes due to dynamic CPU
loads. But, the steady-state temperature can get fairly high. I'll
frequently see about 140 degrees on my systems deployed in hot outdoor
cabinets.

I've found that the insulating properties of the plastic case is what has
the most impact in increasing the temperature. There are various solutions
for this.  I drill about a 1/2 inch hole above the SoC heatsink and leave
the SD-card end of the case completely open.  I mostly use the inexpensive
(about $1.50) cases from China. I'll also try to position the cases (with
nylon ties) so that they'll get a little air flow, which really
helps.....Again, these are installed in outdoor, non temperature
controlled cabinets.

I've not had any RPi failures or stability problems, BTW.


73, David KB4FXC


On Tue, 16 Jul 2019, "Sam Skolfield via ARM-allstar" wrote:

> Hello all,
I've been running a simple node on a Pi2B for a year now, a single node
with a voter instance. It's always displayed around 107º-113º, typically 107
º. Last night I just set up a fresh install on a brand new Pi3B with
heatsink kit with the same voter setup, and was surprised to see it up in
the 120º range. I ran top on both servers and compared, they seemed to have
a similar load. I swapped microSD cards and sure enough the new Pi3B still
ran hot! Both Pis are in plastic enclosures. Perhaps the adhesive heatsink
compound is hurting more than helping? I'm curious if anyone has had
similar experience.

-- 
KJ6QFS
Sam Skolfield
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