From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x236.google.com (mail-qt0-x236.google.com [IPv6:2607:f8b0:400d:c0d::236]) (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 4B2603BA8E for ; Tue, 13 Jun 2017 12:25:59 -0400 (EDT) Received: by mail-qt0-x236.google.com with SMTP id w1so178120962qtg.2 for ; Tue, 13 Jun 2017 09:25:59 -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=Mz7aJ83zQGhTRj1W+E0gi58duh1OqsyOfgDtIJ8Lzts=; b=IWypnPeTk5VqJMEaiGQYR1RnqVAKI3Ks0CMbPZjhZx9ZBs9QSn1xX2zXKAqdMfOzxf soNMfDNDnZGp48m5krWwMboP3ZEXd+LzEZsp6/w2dY3hqx+J+xTcaGIu9uUz25rzsSap I3c8gDcbpIgRRyvEBV/sGra+HnWzUaJnsq6i87DjmfzIBNsZF9Kiye6IOBylZ113h0cN s/4+obJePO9LFgYxHboV9zLyRkO+rxPKNdLF5sEVQIvMzeIT1YTGp9VhfpAjFOBGEUDi qnclll6exYmFRb0qL/dLO3NU6bQAcJ9pwWGpwTRm4e/JZYzmAK/e+4PIjMO3WMlvCzGR MqLQ== 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=Mz7aJ83zQGhTRj1W+E0gi58duh1OqsyOfgDtIJ8Lzts=; b=TsOMdhzX0ecIJRT+T2IdWYnP4i4HnILdqkNGlpClsvaxJiD47SRbOyzUeFIujOOSVI qfbOHmbaF0mVTGXSV4QIkWAUz9I9EvHuWgVMLTpQS2ItaubHmObzhZY3tAyUPJxI5vbs x8biUwWBV11FXu57MWDUBv/LIRXJhFKpTY2aaMn9+fGwZaXlffHumA5IKYNF3dLst6t2 CVY+KMKa/OMtcRCuFAEEssCe66wUkP5vi8g/TKDxeVu2C10FFMrniYlxmfcaMxcWtSDo q0+J+p5r/LXcI76sIeZHF14PhAOCIxIjkzm5PZCspqWt3eS+9BPT/bCupUzsDeqGqLLt 1Z8A== X-Gm-Message-State: AKS2vOzoqFcb5mkfdZ2cZ45HZf5gkVrWjSuY6cxjmwlQx4MZj4G2zpDE 66/VKFhZsa53Zwbj X-Received: by 10.200.53.193 with SMTP id l1mr997195qtb.7.1497371158090; Tue, 13 Jun 2017 09:25:58 -0700 (PDT) Received: from [10.100.0.184] ([144.121.2.62]) by smtp.googlemail.com with ESMTPSA id w68sm9330403qkb.1.2017.06.13.09.25.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Jun 2017 09:25:57 -0700 (PDT) To: Christopher Robin , cerowrt-devel@lists.bufferbloat.net References: <2d60e776-2a4f-de66-0d2f-a36568562f96@gmail.com> <1496685154.544113991@apps.rackspace.com> From: Richard Smith Message-ID: Date: Tue, 13 Jun 2017 12:25:55 -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: 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, 13 Jun 2017 16:25:59 -0000 On 06/13/2017 09:03 AM, Christopher Robin wrote: > > On Tue, Jun 13, 2017 at 8:24 AM Christopher Robin > wrote: > > > On Tue, Jun 13, 2017 at 7:52 AM Richard Smith > wrote: > > On 06/09/2017 10:02 AM, Dave Taht wrote: > > > My use case used to be covering hundreds of km in the Nicaraguan > > jungle. The prototype for that covers a mere 110 acres in the los > > gatos hills, trying to get stuff deep into ravines and so on. > > Accounting for wost case is always what amplifies the > requirements of an > off-grid system. > > NASA Surface meteorology and Solar Energy claims that for Los Gatos > December is the lowest output. Given a split-the-middle tilt > alignment > of 37 degrees it will receive average full-sun net of 3.5 hours. > > > Dave: With these being tree mounted, how likely is full-sun? I'm not > familiar with the tree type/density. Are you're looking to avoid having > separated solar panels? > > Richard: I would presume these calculations are all for "open field" > conditions? > > If the panels are under a tree canopy, a lower attack angle may be > better to better utilize morning/evening sun. A higher one may be > necessary to get a useful charge during peak daylight. I've seen some > pretty impressive calculators to work out best guesses for field testing. Yes. All best case there. Nothing fancy. I was just trying to show a rough relation to the size of the system and uptime given crappy conditions without getting too complicated. As you mention, figuring out the best setup can get pretty hairy. Optimizing for in-tree use is left as a future exercise. :) Optimum tilt for Dec is listed as 62 degrees but that only increases the full-sun from 3.5 to 3.9 so it doesn't change the analysis that much. Given there so much leeway in the peak months it certainly makes sense to be optimized for maximal production in the low months. -- Richard A. Smith