Celestron C90 F/14 Mak-Cass
William Optics GT81 Blue Edition APO
Celestron NexStar 102GT
Celestron TS 70 Refractor
Orion Sirius EQ-G
Quote:I am taking pictures right now at my dark site. My Sirius is showing a voltage Reading of 11.5V, but my voltmeter reading at the battery shows 12.64V. What could be happening? I am using a 101Ah deep cycle marine battery powering only the mount.
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Quote:Thanks Uncle Rod for the information. Should I ignore the blinking light too? It blinks even when the mount is parked doing nothing.
Quote:If you've got a blinking light, that does indeed indicate low voltage. The figure you gave for voltage at the battery indicates something's bad with the battery, especially if you are measuring it when it's not under load. Check connections and try a different battery. Even deep cell batteries go bad.
Celestron Super C8+ (deforked) Atlas EQ-G Mount Celestron Onyx 80mm ED F Canon T4i (unmodified)
Quote:Yes, with the proviso that it only draws that much current when it is slewing at full speed...
Quote:Fascinating. I took to the mountains a 101 amp/hr battery with me for my Atlas EQ-G mount. I ran for 2 hours or so the first night then on the second night ran about 2 more hours and started getting the blinking light and low voltage indicated on the hand controller. The battery had been fully charged prior to the first night out. In fact on night one, the hand controller indicated a battery voltage of about 12.4 volts. On the second night, I got the flashing led and checked the hand controller indicating 11.5 volts. I didn't think to check the connection on the mount, wiggle it or something, as I had heard this can be a problem point. I am fairly certain I did the math correctly in that the Atlas EQ-G draws less than 2 amps/hr. my battery is a 101 amp/hr deep cycle which, I understand, should be able to withstand. 50 percent drain before needing recharging, so about 25 hrs in my case. Is this accurate?