Re: [Cerowrt-devel] solar wifi ap designs?

[Jim Gettys <jg@freedesktop.org>]

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On Mon, Jun 5, 2017 at 6:49 PM, Joel Wirāmu Pauling <joel@aenertia.net>
wrote:

> I've installed several 3800's into Fibre Install van's attached to
> Inverters and LTE Dongles to provide in-van wifi. One has been going for
> the last 5 years without issue so spikes seem to be well tolerated.
>

​There is the converse problem: I've recently had two USB hubs fail
 (serially) on a telescope system.  My theory is that their 12V supplies
really don't like to be fed 13.8V (to get rid of a pile of dongles and
wires on the telescope, we replaced them all with a common regulated power
supply that is ​at 13.8V, which is what most car batteries *actually* put
out when fully charged).  The hubs would have to dissipate a lot more power
to keep the USB port voltages at spec'ed voltages, shortening the hub's
lives.

Basically, while OLPC was carefully designed to be very tolerant of input
voltage as Richard Smith pointed, many devices are not and you cannot
presume no problems may occur.

Care is in order.




> On 6 June 2017 at 09:51, Michael Richardson <mcr@sandelman.ca> wrote:
>
>> Such an interesting thread.
>> But, is the 3800 tolerant of spikes of 13.6V?  Has anyone tried?
>> I haven't many left :-)
>>
>> --
>> ]               Never tell me the odds!                 | ipv6 mesh
>> networks [
>> ]   Michael Richardson, Sandelman Software Works        | network
>> architect  [
>> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on
>> rails    [
>>
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