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Hi Jerry,

So, bottom line, what is the minimum voltage that
the Gemini 2 requires to work in the field at a
remote location running off of deep-cycle batteries?

Will it work with 12 volts?

Yes. I operate my Titan using a 12V 5A switching power supply (measured
12.2V) at home and a 12V 32Ah gel battery in the field.
I used the same battery at the G1 for many years w/o any problem.

If people had problems, these were usually caused by voltage breaking
down under load, caused by weak power supplies, thin wires to the power
supply, bad contacts.

I yet have to test it (could someone with an adjustable power supply
please do) the minimum voltage. I guess, that with some limitations on
slewing speed Geminis could work down to (stable) 9V.

搁别苍é

Jerry

At 11:01 PM 2/1/2011, you wrote:

Jerry,

Is the new Gemini 2 going to be happy with lower voltages than the
old Gemini 1?

Anyone know anything about this?

Not an easy question!

We experimented with the PWM handling. The new
algorithm gives more torque at low speeds, so
guiding/tracking should be somewhat better.

Of course, the motors are the same. Once their
inductance and resistance leeds to increase the
PWM duty cycle to 100%, there's a limit that
needs higher voltage to be overcome.

So I think that tracking/guiding performance
will be improved at low voltages, fast slewing
higher loads will still need higher voltages.
One member of our beta test made CCD
tracking/guiding tests and achieved very good results.

搁别苍é

A Beginner's Guide to DSLR Astrophotography:


An Advanced Guide to DSLR Astrophotography:


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