From: John De Armond Newsgroups: misc.rural Subject: Re: Tractor solar battery charger Date: Thu, 19 Jan 2006 14:42:47 -0500 Message-ID: <6gqvs1hhtrh93eslao1k99l50h8qvsbpl1@4ax.com> I have several of these. I have one on my motorhome's cranking battery. Another on my backup car. A third in my regular car that keeps my booster pack charged. I bought a bunch of 'em at a hamfest so I don't have much money involved. I suggest getting the largest panel you can afford. I'm not sure 1.8 watts would keep the battery up over the long term. Especially in winter. I think mine are 5 watts. I've seen some 5 and 10 watt ones on sale at both Northern and Harbor Freight recently. Here's an alternative to think about that would cost about the same or a little more. The BB600 military aviation NiCad cranking batteries: http://www.sg-photo.com/nicad_batteries.htm These have been military standard since after WWII. Their life is indefinite. I have a 28 volt pack of Korean War vintage that still produces its rated capacity. The self-discharge rate is so low as to be almost non-existent and low temperature has little effect. The only maintenance is to occasionally add water (they gas when charging) and about every decade, change the electrolyte. The potassium hydroxide electrolyte slowly absorbs CO2 from the air and is neutralized. I've changed mine twice. John On Thu, 19 Jan 2006 17:19:58 GMT, "Stumpy" <perilmung@spamnet.con> wrote: >I've got a tractor that only gets run ~4hrs/3months(not at home). The >battery can't stay charged up and I have no electricity in the vicinity. So >far I jump it from my car and then it can start on its own when warmed up. >I considered pulling the battery when I leave and putting it on a "battery >maintainer" when I get home, but don't really want to lug the battery back >and forth. > >Found this solar charger for an RV that is only $30, 1.8watts @ 15V. I >could install a cigarette lighter outlet on the tractor, get a cigarette >lighter extension cord, and put the charger on the roof of the tractor shed. > >My question is - Would the battery be discharged by the long periods of no >sun, night time etc.? I guess if the circuitry is good enough quality that >would not happen. Has anyone used one of these unattended for any length of >time? > >Is it OK to post a link? > >http://www.motorhomesandmore.com/mh_store/findsku.cfm/sku=4231 > |