Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=5.0 tests=BAYES_00,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id s8QMsSd8011481 for ; Sat, 27 Sep 2014 00:54:28 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XXeMU-0001S0-Dd for rs_out_1@blacksheep.org; Fri, 26 Sep 2014 23:51:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XXeMU-0001Rr-1P for rsgb_lf_group@blacksheep.org; Fri, 26 Sep 2014 23:51:38 +0100 Received: from mail-la0-f53.google.com ([209.85.215.53]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.82) (envelope-from <73dk7fc@googlemail.com>) id 1XXeMS-0005et-6k for rsgb_lf_group@blacksheep.org; Fri, 26 Sep 2014 23:51:36 +0100 Received: by mail-la0-f53.google.com with SMTP id ty20so2728376lab.40 for ; Fri, 26 Sep 2014 15:51:34 -0700 (PDT) X-DKIM-Result: Domain=googlemail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=zfBb2lla/l/KzDMeJj5zZE0Mnp2HMv/Vd8lsNgVxDCg=; b=YyE0fm60ynysOgO3tbwcMudOg5U9doLjj07hXpViH9aSn8/tr3mTAJRX3T5SC1Sxkf LWnGi3HxgHF4tsq8D015exuTs2fZXwcc/evrgJu8GpvE/Rm4CX4SIJ+aa0JMZnNcO+9u 4Sa4QcDv02nYLdUftLZEEHg5xEa35ip+ukE0cAqzgScoEECNww4ne1el7HMlljOY3wvU Iu06ax1QBjh7r/nl28OKueTyccfgbKW5R5Cz/8DOWqh/n3+7JVM2yR5kQ+WlOPsx929r aLrm9nUXMHcnmYSR+FB6xzkWt1bN2EY4lhOxoA5Di7i/W+VNbeb2DruAlNVkVhKO/Mdx W6wA== X-Received: by 10.152.22.100 with SMTP id c4mr4778846laf.0.1411771894600; Fri, 26 Sep 2014 15:51:34 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id bc1sm2307495lab.40.2014.09.26.15.51.32 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 26 Sep 2014 15:51:33 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <5425EDF3.9090806@gmail.com> Date: Sat, 27 Sep 2014 00:51:31 +0200 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4B47B680CCBD46B69C3FB841C5A3081F@AGB> <53FE3567.8020208@gmail.com> <009701cfc23e$b4bdc410$1e394c30$@simnet.is> <53FE51E1.3060303@gmail.com> <53FF23E8.10907@gmail.com> <5400127E.3000808@abelian.org> <540049C6.9050006@gmail.com> <143F048B24A040058ED88A15AE211979@MichaelSappPC>, <5402465F.1050101@gmail.com> , <5410AC37.6050506@gmail.com> , <873BC5A1589F4B79B2142360B52A648F@White>, , <5414A1CD.6060608@gmail.com> In-Reply-To: X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: LF: OT, Remote site, garden progress, Solar battery charger Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: RO X-Status: X-Keywords: X-UID: 499 Hi all, Since today, my solar powered battery in the garden is charged by this solar battery charger, https://dl.dropboxusercontent.com/u/19882028/20140927_004153.jpg It took some time until i found the circuit that suits my requirements. The losses are very low! The supply current of the circuit is just 40 uA!. The circuit is a comparator design which generates no QRM during ON and OFF times. The switching transients are relatively slow (not like in usual switch mode supplies). The hysteresis causes a switch-off voltage of 13.9V and a switch-on voltage of 13.3V. The high current diode which is a very low forward voltage drop is taken from an old SMPS... Just in case someone want to play with similar stuff and likes to have some ideas... 73, Stefan/DK7FC PS: Yes yes yes, of course the may be similar circuits in the web and someone has done it before. But it wasn't the goal to do something the first time, as usual :-)