From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x22b.google.com (mail-lf0-x22b.google.com [IPv6:2a00:1450:4010:c07::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 711783B2A4 for ; Mon, 5 Jun 2017 22:03:54 -0400 (EDT) Received: by mail-lf0-x22b.google.com with SMTP id o83so31714822lff.3 for ; Mon, 05 Jun 2017 19:03:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=r6LAz4RVued2483YKztfmV+vOixLPTsWb62yHpj0GsQ=; b=gLXx0z/5Jv4hj14fZnxtwK08lr8sQPyxYSYCNqEczfrxC/KovFbamUMdOxDArSyncg kGlN34GfJTiRJiKylQLjwWmYsn7DW3UnkDPO1RQBsNGw3iqHphfucH5cQHtdRYrMOiWZ QZbirkM2yCEEb6Oe3wcgtMHrFE2unwu3OzwfqLRyp7cxgYIiz+USJ9bMHEZtmqG0FOLb n322fzuXV0N2lh82H8F5xoNrsVfplx4LbEFDElXKqzYYQKIbrNs/8QEohcGL+OC6Tg8j OsRfRqroCAI4I40S4JBuKIIZQRE659OjbCb4zFy84mX8YRQrfOORDCx5qiMRwgOHzxBc AOYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=r6LAz4RVued2483YKztfmV+vOixLPTsWb62yHpj0GsQ=; b=ddMjo5wC6aakgLMiVO9EHJYfqDM8jYTKJ5949Zk6pZI3MUEwdTs8hY/4gdBet9wMRV mFeEFz56Gc6/SSxV+FGch55XK9jWpLTlm9fkoFzBBfJTDqoLtnZndE+LNo6Nm0irB1y0 gCtmfbCJk0KkycJZ1QTgCBV0SmC4PSchodDlQzysQP8SYmLS9+7Fd+Mi8AS6wm00bNOP NzXrcmEWSTkXR/B0KvBjWdjvHnlVDfM1y9ILxt9KN4dsw36H6Zhv1NCnmKHnHCKXnBFn B/hmmVk3SrFYZoGW10eKhn16Qsj7+b8tX8h1c3+3yJaEakZRz2cqjmT391ZNaoSr20fm EHIQ== X-Gm-Message-State: AODbwcCxRfqP0q2vgE32LMldqWReb2jhx+1Rq5H1s4JSKzW7flOC7sI6 LBH97abYRoTDKUo5B0SJPVEbN3qyvQ== X-Received: by 10.25.80.30 with SMTP id e30mr3866401lfb.148.1496714633005; Mon, 05 Jun 2017 19:03:53 -0700 (PDT) MIME-Version: 1.0 Sender: gettysjim@gmail.com Received: by 10.25.207.137 with HTTP; Mon, 5 Jun 2017 19:03:52 -0700 (PDT) In-Reply-To: References: <2d60e776-2a4f-de66-0d2f-a36568562f96@gmail.com> <6143.1496699488@obiwan.sandelman.ca> From: Jim Gettys Date: Mon, 5 Jun 2017 22:03:52 -0400 X-Google-Sender-Auth: Kh9b9-pGgMsiwQ_HsEkf1OfcTaQ Message-ID: To: =?UTF-8?Q?Joel_Wir=C4=81mu_Pauling?= Cc: Michael Richardson , "cerowrt-devel@lists.bufferbloat.net" Content-Type: multipart/alternative; boundary="94eb2c1cd62207d4df05514108b1" Subject: Re: [Cerowrt-devel] solar wifi ap designs? X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Jun 2017 02:03:54 -0000 --94eb2c1cd62207d4df05514108b1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Jun 5, 2017 at 6:49 PM, Joel Wir=C4=81mu Pauling 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. > =E2=80=8BThere 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 =E2=80=8Bat 13.8V, which is what most car batteries *actuall= y* 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 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 [ >> >> _______________________________________________ >> Cerowrt-devel mailing list >> Cerowrt-devel@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/cerowrt-devel >> > > > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel > > --94eb2c1cd62207d4df05514108b1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

On Mon, Ju= n 5, 2017 at 6:49 PM, Joel Wir=C4=81mu Pauling <joel@aenertia.net><= /span> wrote:
I've installed several 3800's i= nto Fibre Install van's attached to Inverters and LTE Dongles to provid= e in-van wifi. One has been going for the last 5 years without issue so spi= kes seem to be well tolerated.

=
=E2=80=8BThere is th= e converse problem: I've recently had two USB hubs fail =C2=A0(serially= ) on a telescope system.=C2=A0 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 o= n the telescope, we replaced them all with a common regulated power supply = that is =E2=80=8Bat 13.8V, which is what most car batteries *actually* put = out when fully charged).=C2=A0 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.

Basical= ly, 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 pr= oblems may occur.

Care is= in order.

=



On 6 June 2017 at 09:51, Michael Richardson <= mcr@sandelman.ca&= gt; wrote:
Such an interesting thr= ead.
But, is the 3800 tolerant of spikes of 13.6V?=C2=A0 Has anyone tried?
I haven't many left :-)

--
]=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Never tell me the o= dds!=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| ipv6 me= sh networks [
]=C2=A0 =C2=A0Michael Richardson, Sandelman Software Works=C2=A0 =C2=A0 =C2= =A0 =C2=A0 | network architect=C2=A0 [
]=C2=A0 =C2=A0 =C2=A0= mcr@sandelman.ca=C2=A0 http://www.sandelman.ca/=C2=A0 =C2=A0 =C2=A0 = =C2=A0 |=C2=A0 =C2=A0ruby on rails=C2=A0 =C2=A0 [

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