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Re: Battery questions [TANKS]
Wed, 12 Apr 2006 13:27:27 -0400
Excellent info as always. Thanks Steve!!!
----- Original Message -----
From: "Steve Tyng" <STyng-at-acptrust.com>
Sent: Wednesday, April 12, 2006 10:37 AM
Subject: RE: Battery questions [TANKS]
> Jeremy wrote:
>> Just wondering how changing/charging batteries work on the
>> battlefield. I know that batteries can be moved around on
>> the battlefield by supply vehicles, but is there enough time
>> to charge batteries during the day or do I need enough
>> batteries to make it through the entire day?
> It takes longer than the couple of hours between battles to charge a
> battery. My 24V 6amp charger takes overnight to charge one set of 18AH
> batteries. Most battlers bring enough batteries for two one hour
> battles. In the Cromwell's case, I will usually use two sets 18AH
> batteries for a days battling (four batteries total). I bring an extra
> third set as a backup. The T34 ran at 12V and carried only one 18AH
> battery and could go through three batteries in one hour of battling.
>> It would seem to me that I'd need quite a stack of batteries
>> if there isn't a chance to charge any up.
> The number of batteries your tank will need depends on many factors
> (motors, voltage, space, driving style). Also, It appears that PWM
> motor controllers are more battery efficient than on/off controllers and
> will give longer running times.
>> Also, is there normally AC power available near the
>> battlefield? Should I get a charger that can run on DC and
>> use my car to charge the tanks batteries?
> Usually AC is not available at the battle sites. Get a smart charger
> that will charge and then maintain your batteries. Avoid cheap
> automotive battery chargers because it is easy to leave these on for to
> long and you will end up overcharging your batteries and damaging them.
>> One last question: I was cruising ebay looking at gell cells
>> and there are some people selling giant (~100AH) batteries
>> made to go in UPS's. Is it better to get two of these (I'm
>> going to run 24v) and try to charge them in the tank between
>> battles and run the whole day that way, or get several sets
>> of smaller batteries and have to change them out?
> Most battlers get by with 26 to 36 amp hour capacity for a one hour
> battle. 100AH of battery in your vehicle (if it could fit) would
> probably be overkill.
>> Has anyone
>> had problems with the gell cells dieing from continually
>> charging them up and then draining them down to almost
> Don't drain them too nothing. I added an easily visible voltage meter
> to the Cromwell to avoid such a situation.
>> I thought that doing that was very bad for gell
>> cells/lead acid batteries and that deep cycle batteries would
>> work better for such an application.
> Yes, draining lead acid batteries below a certain voltage level (11.6
> volts I think) will begin to damage them. Deep cycle batteries are what
> you want. Avoid automotive and motorcycle starter batteries. Batteries
> marketed for alarm and UPS systems are deep cycle.
> Steve Tyng