>Subject: [M]: Re: Help With Deep Cycle Battery
>Date: Fri, 27 Feb 2004 23:16:42 -0500
>
>Christian,
>
>A word of caution. DO NOT operate the notebook computer and LX200 off of
>the same battery, particularily if you have the computer connected to the
>LX200 through the serial port via a cable. You can get a wicked ground
>loop
>problem and can worst case burn out your serial port on the LX200 board or
>best case get very erratic operation of the LX200. Run the notebook on one
>battery and the LX200 on another. That way they have separate grounds. I
>believe the problems comes about due to the fact that one of the pins on
>the
>serial port has power and or else it's not truely at ground potential.
>Check out the MAPUG archive for more details
>
>RIK at 40N by 76W
>
>
>----- Original Message -----
>Sent: Friday, February 27, 2004 9:59 PM
>Subject: [M]: Help With Deep Cycle Battery
>
>
>I went to Walmart and got a 75 Amp Hour Deep Cycle battery and a 10 amp
>charger with trickle charging capabilities. I am thinking something is
>wrong because, 1. As I mentioned a while ago, my lx200 hooked up to this
>battery with the 1812 sounds like it's going to stall when it slews at high
>speed (this could be the 1812 too) 2. We had an outage the other day that
>lasted 3 days because of a wind storm and we used this deep cycle battery
>to
>watch TV. It only lasted 2 hours with TV (27 inch) VCR, and TiVo hooked
>up
>to it through a Coleman 800W inverter. SO, I am hoping you guys can give
>me
>some theory so I can troubleshoot. These are the questions I have:
>
>1 - I am weak in electronics. To make the equation easier, if I have a 7.5
>amp total charge pulling from this 75 amp hour battery, would it last me 10
>hours from when it's fully charged?
>
>2 - The LX200 pulls less than 1 amp correct?
>
>3 - For those of you that use this type of battery, can anyone tell me how
>long it has lasted on a full charge and what you were pulling with it? I
>just have the 10" LX200, SBIG ST-7 and Dell Inspiron 8200.
>
>4 - Do these inverters waste power? Would I be better off trying to run
>straight from the battery for everything instead of using the inverter?
>
>5 - I bought 4 cigarette lighter outlets and mounted them in this 22"
>toolbox with the battery inside, in parallel. Meaning that the positive
>terminal from the battery feeds all the positives and the negative is
>connected to all the negatives, with a 30 amp switch that turns power to
>the
>outlets on and off. Is this correct?
>
>Tomorrow I am going to turn everything on in the morning and see how long
>it
>lasts. Every half hour or so I'll slep the scope a couple times. We'll
>see
>what this test yields, but I wanted to see if anyone had some advice.
>
>Thanks!
>
>Christian.
>
>
>

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