I would respectfully disagree with the policy of using two packs and two
switches. I feel that it gives little redundancy in the case of a shorted
battery, in this case you will see a rapid drain of juice from the good
battery. I know this practice hase become popular in the giant scale power
crowd, and if you are willing to replace batteies often, and or monitor
their discharge curves on a regular basis, this is a viable solution.
One, in my experience, fool proof backer is the EMS (Electronic Model
Systems, formerly JOMAR)
battery backer. It protects against back drain from pack to pack, and will
in the event of two low packs continue to switch back and forth to get the
better pack. It is technology used in RPVs and only costs 45 bucks, the cost
of a battery pack. And you can use packs of different capacities as longas
they are the same voltage. 4.8 or 6 volt. This in combination with two
switch harnasses gives better total redundency at a relativly low cost.
John D.
http://www.scalesoaring.net
>On Fri, 30 Nov 2001 07:00:54 -0800 Bill Malvey <[EMAIL PROTECTED]> wrote.
>On 11/30/01 1:18 AM, "Kent Miller" <[EMAIL PROTECTED]> wrote:
>
>> I saw somewhere that someone makes a dual battery setup. Can someone
steer
>> me towards it ?
>
>Go here:
>
>http://personal.lig.bellsouth.net/lig/r/e/redscho/
>
>I have been running dual battery packs and two switches for years. There is
>absolutely no need to use "backers" , diodes, or anything else. Simply plug
>2 batteries into 2 switches (or even "Y" them into a single switch) and
plug
>into the RX.
>
>All you need to do is make certain you use packs with the same voltage,
i.e.
>4.8 or 6.0 volt (4 cells or 5 cells). The capacity is additive, two 1,000
>mAh packs gives you 2,000 mAh total capacity.
>
>The enclosed link explains it very well. If you are worried (incorrectly)
>about a "full" pack charging a "dead" pack try this (I have). Cycle 1 pack
>down to 1.1 or 1.0 volts per cell. Charge another pack fully. Plug them
both
>into the same RX. Go away for a couple of days. Check voltage when you come
>back. You
>~~
>
>Bill Malvey
>Ladera Ranch, California
>
>
>
>
>
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