From: JEFF HAIN-MATSON (flmv@flmv.net)
Date: Sat Feb 23 2002 - 15:40:16 PST
to respond to both of you:
you are correct, but in a snow plow set up you will have a battery problem. at
least my plow cucv blazer kills the low side battery in about 1 to 2 years. that
is with the plow hot lead tied to the low side battery + terminal. will be
moving the set up to a new blazer and moving the hot lead to the high side -
just to see if the GM engineers were on to anything.
-- JEFF HAIN-MATSON FRONT LINE MILITARY VEHICLES WEB SITE: www.flmv.net WRIGHTSVILLE PA 717-252-4489 VOICE 717-252-4499 FAX flmv@flmv.net E-MAIL MVPA #1833 IMPS #1726 MVT #9362In a message dated 2/23/02 9:16:34 AM, mojoedd@bellsouth.net writes:
>On the other hand in a two 12 volt battery system with two alternators >that each provide power to one battery, (such as my CUCV), I wouldn't think >that this would apply?
Correct, the CUCV charging system charges each battery independently. Jeff
Ed Kirkley wrote:
> Jeff, > > I understand the wording of your message and in that setup I tend to agree. > On the other hand in a two 12 volt battery system with two alternators that > each provide power to one battery, (such as my CUCV), I wouldn't think that > this would apply? > > Best Regards, > > Ed Kirkley KG4OUJ > 1984 M1009 > M103 Trailer > ----- Original Message ----- > From: <TacticalTruck@aol.com> > To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org> > Sent: Saturday, February 23, 2002 09:08 > Subject: Re: [MV] CHEAP (er) 24 to 12 volt converters, if you care > > > > > In a message dated 2/22/02 10:56:38 AM, amnon@deltaforce.net writes: > > > > >This may be a stupid question, but why can't one just run wires from one > > >battery to get 12V? > > > > Let me quote from "Battery Equalizer Application Notes" by Mark Endres, > > Project Engineer Sure Power Industries, Inc. > > "The 24V system normally consists of two-12V batteries connected in > > series, with a 24V alternator providing power. It seems the most logical > > place to to obtain 12V power is the junction between the two batteries. > > However, a problem arises if the system is constructed in this fashion. > > "Consider the situation when the engine is off (alternator is not > > generating), and 12V power is used. Load current comes only from the 12V > "low > > side or A" battery, none of which is being furnished by the top or "high > side > > or B" battery. After a time, the 12V loads will discharge the "A" battery > > while leaving the "B" battery charged up. Since the "B" battery has not > been > > discharged it will not need any electrical current to recharge it; > however, > > the "A" battery will. > > "When the engine is started and the alternator furnishes current to > the > > load and to charge the "A" battery. All the current now flows throught the > > "B" battery, since it is in series with the load and "A" battery. > > "When this happens, a condition exists where the "B" battery > overcharges > > because it does not need recharging, and the "A" battery does not get the > > charge it requires. Charging current for the "A" battery is impeded by the > > already charged "B" battery and reduced by the amount of current that > flows > > to the load. Even if there were no load at this point, the same problem > would > > exist due to the imbalance of the battery charges. > > "When operating the system in this manner, the life of the batteries > is > > dramatically shortened. The "A" battery fails prematurely because lead > > sulfite builds up on the battery plates, reducing the capacity. The "B" > > battery fails when its electrolyte "gasses" and evaporates and damage > occurs > > to its plates and separators in the dry battery cells as a result of ov > > ercharging. Failure time can be as short as a few weeks for heavy 12V > loads. > > "If there is no 12V load, a 24V system with a two battery "stack" can > > operate well without an equalizer. However, the batteries must be of the > same > > type and age. Without a battery equalizer, current draw from one battery > and > > not the other will cause an imbalance. This imbalance accumulates over > time. > > Because the effects of the imbalance are cumulative, battery degradation > > occurs even with very small loads, such as a radio, clock or small lamp" > > The paper goes on to describe how their converter/equalizer works and > the > > benefits of their system. Again, I have some new surplus 25 amp units for > > sale for $150. > > Jeff > > TacticalTruck.com > > > > ===Mil-Veh is a member-supported mailing list=== > > To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org> > > To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org> > > To reach a human, contact <ack@mil-veh.org> > > ===Mil-Veh is a member-supported mailing list=== > To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org> > To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org> > To reach a human, contact <ack@mil-veh.org>
-- JEFF HAIN-MATSON FRONT LINE MILITARY VEHICLES WEB SITE: www.flmv.net WRIGHTSVILLE PA 717-252-4489 VOICE 717-252-4499 FAX flmv@flmv.net E-MAIL MVPA #1833 IMPS #1726 MVT #9362
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