Glad I asked! Do these converters have a decent expected lifetime? If anyone has any good DC-DC converters to peddle, please contact me off list.
Thanks for the help. On Thu, Sep 1, 2011 at 2:48 PM, Jason Szumlanski <ja...@fafcosolar.com>wrote: > 1a x 12V x 24hrs = 288 watt-hours on a 48,000 watt-hour battery. My math > shows 0.6% of the nominal capacity. And that assumes there is no > charging source present. > > That being said, I would agree that avoiding it altogether is the wise > decision, but there has to be a level at which the tapped load is > inconsequential. I'm just curious what that level is! > > Jason Szumlanski > Fafco Solar > > > -----Original Message----- > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Hugh > Sent: Thursday, September 01, 2011 4:21 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] unique battery bank design question > > At 15:57 -0400 1/9/11, Jason Szumlanski wrote: > > > A 1A @ 12V fan on a 1000aH @48V battery bank can't make any real > >difference. Correct me if I am wrong! > > > > Yes that is wrong, because after 4 days you have removed 10% of the > nominal capacity or about 20% of the usable capacity. > > Tapping off batteries is bad practice as universally agreed. One way > to mitigate it could be to use separate shunt regulators (diversion > load controllers) for each 12-volt portion. This would probably be a > healthy feature for 'balancing' any 48 volt battery and would > possibly rescue a tapped battery, given enough surplus energy > availability (which is usually the key thing for battery health). > > Just a thought. > > The snag is the cost. ho hum. > -- > Hugh Piggott > > Scoraig > http://www.scoraigwind.co.uk > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > -- Mac Lewis * "Yo solo sé que no sé nada." -Sócrates *
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