From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x230.google.com (mail-qt0-x230.google.com [IPv6:2607:f8b0:400d:c0d::230]) (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 BBECA3CB36 for ; Tue, 6 Jun 2017 08:04:25 -0400 (EDT) Received: by mail-qt0-x230.google.com with SMTP id w1so126197060qtg.2 for ; Tue, 06 Jun 2017 05:04:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=5j7U3rorpBo9RiX/J9H8Rj+0Vda7ihR8qzFpgUD8Wbg=; b=dz60TlCKXV3KOboOL7PsQGmEVgFs2o/NEW+nnSbK52AskBHSch1LbGlsP6bIuH/2Wi XWCRJ0ufNofT5WnNXboFOyagqRl6ZVwofWao8+4hFq6lLPtkWQ0LF6xne6ra6i6y/AQe 6C1adkct+dk3Vf2Vkmvd6gtag6boMTWgGNAfaBXf71Cnnxt9B6L7be1Duli7va1I1wO0 LVOo0ByE5qBmLL/WFnQ18ziyU/c4e+NjocXSy6GLK6rr3crWUhaUo0HBA1sBovGUBIl6 sRc3MtQ6tAfC+btVjN7Ga2yAxQzxNQFSM7THyJMN1GvPwxyPDaMce0MRYUCdFuoM7V9x AhzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=5j7U3rorpBo9RiX/J9H8Rj+0Vda7ihR8qzFpgUD8Wbg=; b=e7P8i74T0c5to/K63r7gI+FHStDoVKb6MHhutm3sUV4dY0oNAeITN6bKII+A1bMXwl qg+lR3YioQJ1pEllUxjHdvASV8qIwbSk0T+8659egu1mTwAa/Q9eHXzkxB6uX891Xp1Y yRfJEjTs+8zX/hOvMHMzyT+qeNpEgiTSeUwV5SbGfGXbNxSDrikrk9W6dBDsRjyfhpsB z/ntkZvieWkMRypZ5aKvO993Guzp3wEDuTCGKyODr1GzmvgTbkG9skjBLHzipjD+4D+K icZ6YT2Apq3A91xPRW2/RuDzIGDjqGlclcKGTLGFtwQNbXRpFZnsGxmMxCkjQ7kLlmDE lerw== X-Gm-Message-State: AODbwcB/MDVvz1n3uArHzZ7LPGwtr02+CjIyVRym2yeFHzQymeyPnKcO XZoX4FtVporMxzn0 X-Received: by 10.55.203.132 with SMTP id u4mr27955123qkl.59.1496750665148; Tue, 06 Jun 2017 05:04:25 -0700 (PDT) Received: from [10.0.0.239] (c-65-96-168-175.hsd1.ma.comcast.net. [65.96.168.175]) by smtp.googlemail.com with ESMTPSA id l185sm4757144qke.36.2017.06.06.05.04.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 06 Jun 2017 05:04:24 -0700 (PDT) To: cerowrt-devel@lists.bufferbloat.net References: <2d60e776-2a4f-de66-0d2f-a36568562f96@gmail.com> <6143.1496699488@obiwan.sandelman.ca> From: Richard Smith Message-ID: <6ea25924-f10b-1dfc-4747-46f430073bd8@gmail.com> Date: Tue, 6 Jun 2017 08:04:24 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <6143.1496699488@obiwan.sandelman.ca> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit 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 12:04:25 -0000 On 06/05/2017 05:51 PM, 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 :-) OpenWRT has some hardware info here: https://wiki.openwrt.org/toh/netgear/wndr3700#tab__hardware_details Which has a pointer to the data sheet for the onboard regulators. http://www.st.com/stonline/stappl/st/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00169322.pdf The datasheet says those are good up to 18V input so that's promising. It will depend on what they did with protection circuitry (if any) and the thermal design. I'd be surprised if it 13.8V made it smoke but depending on the thermal design it might be a problem at higher temperatures. That said, an automotive electrical system is a _very_ harsh place. 13.8-14.2V is just the nominal output of the voltage regulator for charging the battery. It's by no means the limit of the spikes that can occur. I would not recommend any electronics not designed to work in a car be used without some sort of external protection. Load dump can cause very large voltage swings for extended periods. Here's an app note that talks about some of the hazards. www.st.com/resource/en/application_note/cd00181783.pdf -- Richard A. Smith