Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- Losmandy_users
- Messages
Search
|
Re: Just purchased GM811GHD
At 0.5 A, a 22 Ah battery would be good for 22 hours on the basis that these types of batteries should not be discharged to more than 50% pf their capacity.
toggle quoted message
Show quoted text
22 Ah*50%/0.5A? = 22 hours I have had good luck with Power-Sonic SLAs (I have 3).? This is a link to their 12V series. ? Bryan Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "bvalente@... [Losmandy_users]" <Losmandy_users@...> Date: 12/08/2017 11:33 AM (GMT-08:00) To: Losmandy_users@... Subject: [Losmandy_users] Re: Just purchased GM811GHD ? yes, they will definitely work.? Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B ? |
|
Re: Just purchased GM811GHD
开云体育On power, you might consider using a lithium iron phosphate battery.? It is tolerant of temp unlike lithium batteries but is not cheap.? But it is lighter and, with purchased battery charger, you can use it at home plugged in.? You just add cig lighter jack and fuse and away you go. https://www.powerstream.com/LLLF-12v.htm Chuck Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "bvalente@... [Losmandy_users]" <Losmandy_users@...> Date: 12/08/2017 11:33 AM (GMT-08:00) To: Losmandy_users@... Subject: [Losmandy_users] Re: Just purchased GM811GHD ? yes, they will definitely work.? Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B
|
|
Re: Just purchased GM811GHD
Ditto B,
toggle quoted message
Show quoted text
I use two 55 amp-hr batteries to power? all my imaging equipment each session. John Hobbs
hobbs_john@... -----Original Message----- From: bvalente@... [Losmandy_users] To: Losmandy_users Sent: Fri, Dec 8, 2017 2:33 pm Subject: [Losmandy_users] Re: Just purchased GM811GHD
?
yes, they will definitely work.?
Car starter batteries are more designed around offering a maximum amperage to kick over the motor.?
for astro that's not important -? instead we want greater battery capacity, hence amp-hours
if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long
me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more.
just FYI
B
|
|
Re: Just purchased GM811GHD
yes, they will definitely work.?
Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B |
|
Re: Just purchased GM811GHD
Yes for that amount of money you ca buy a 50 Amp/hr battery.
toggle quoted message
Show quoted text
John Hobbs
hobbs_john@... -----Original Message----- From: Brian Valente bvalente@... [Losmandy_users] To: Losmandy_users Sent: Thu, Dec 7, 2017 11:10 am Subject: Re: [Losmandy_users] Re: Just purchased GM811GHD
?
I'm not sure that's a great battery for astro (although that seems like a good price for a general battery safety thing). 1200 amps is the max for starting a car, which is not important for steady power to astro gear. the important one is 22amp hours. A straight 22 amp hour 12v battery is about $45.?
B
On Thu, Dec 7, 2017 at 5:47 AM, steve hammel shammel00@... [Losmandy_users] <Losmandy_users@...> wrote:
Brian?
Brian Valente
portfolio
|
|
Re: Just purchased GM811GHD
开云体育But if you buy a bare battery you of course also need a charger, connectors for whatever you want to hook to it, an inverter if you have stuff that needs 110VAC, and probably some kind of case.?Going the other way, there’s this kind of thing??which costs quite a bit more per watt-hour, but it’s a lithium battery so weighs only about 1/3 of the lead-acid equivalent, and has 5V, 12V, and 110V outputs. Although, come to think of it, a lead-acid battery is still light weight compared to a Losmandy mount. :) ??-Les On Dec 7, 2017, at 8:10 AM, Brian Valente bvalente@... [Losmandy_users] <Losmandy_users@...> wrote:
|
|
Re: Just purchased GM811GHD
wes Bolin
I bought the jump-start battery with minimum number of bells and whistles at Harbor Freight for about $50.? It ran all night with my G11GT and still showed a green led saying it was charged.? YMMV. Wes On Thu, Dec 7, 2017 at 10:10 AM, Brian Valente bvalente@... [Losmandy_users] <Losmandy_users@...> wrote:
|
|
Re: Just purchased GM811GHD
I'm not sure that's a great battery for astro (although that seems like a good price for a general battery safety thing). 1200 amps is the max for starting a car, which is not important for steady power to astro gear. the important one is 22amp hours. A straight 22 amp hour 12v battery is about $45.? B On Thu, Dec 7, 2017 at 5:47 AM, steve hammel shammel00@... [Losmandy_users] <Losmandy_users@...> wrote:
--
Brian? Brian Valente portfolio |
|
Re: Just purchased GM811GHD
For a battery pack? check out Lowe's they have a Shuemacher 1200 hundred amp power pack on sale for $100
toggle quoted message
Show quoted text
It has 12 volt Outlets plus a 110 inverter.? Just an option?
|
|
Re: G11 cable management
At 08:13 07-12-17, jfev5mnsvqiyzpq756wvokt55jve7sbg2esr5mip@... [Losmandy_us wrote:
A slight detour from the topic, but as I'm trying to get to know the full landscape:There is the Explore Scientific GoTo system which can be retrofitted to G-11 mounts. It uses stepper motors that are not noisy. The best information about this that I have found is at: David |
|
Re: Just purchased GM811GHD
Thank you all for the help! I just got my GM811GHD!?
I bought a large rolling toolbox from home depot and bought some foam online to make a cheap but protective case such as the pelican cases (not airline safe though). I'll use this for the RA and DEC axis' and any smaller accessories. I got an Orion padded telescope case to carry the HD tripod around (that thing is a beast). Luckily my apartments have an elevator so rolling/carrying these down won't be too difficult.? I also just purchased a QHY Polemaster that will come in the mail this week.? Still deciding on if I need to get the RA extension yet. Might try to machine something myself to do something similar.? Next will be to figure out how to DIY a portable 12V battery pack? I'll probably make a more detailed post on how I DIY'd my carrying solution for the mount + tripod. Can't wait for clear skies to try everything out! |
|
Re: G11 cable management
开云体育Magnus,The stepper motors are the original motors used on the G11, they do not support Go To, just tracking and guiding. I replaced them only because I wanted to remotely control my telescope. They are still available as an option on the web site. 'G11 S - G11 Mount with Digital Control 492 System. Stepper Motors outboard of mount. Standard 2 Point Worm Gear Block Assembly.' Regards Paul
|
|
Re: G11 cable management
Hi!
A slight detour from the topic, but as I'm trying to get to know the full landscape: - what stepper motors? I see that there are stepper motors sold by Losmandy, and another set for using with a different GoTo system in Germany. But what are the Losmandy stepper motors for? I recently upgraded my servo motors to new high torque servo motors.. should I have had steppers instead? Magnus |
|
Re: G11 cable management
开云体育Chip,It’s funny you should say that, the first thing that people comment about when they see my tucked in motors is “they are a lot quieter than normal”. I hadn’t noticed because I moved from the stepper motors, which are effectively silent. Regards Paul
|
|
Re: finderscope bracket
I have a Losmandy polar scope on my smaller Losmandy the GM8 and it works very well for visual use but if imaging it's not good enough without additional work using the drift method, SharpCap or PHD2 and at that point why bother? I've tested and used?new Sharpcap 3.1, PHD2 and PoleMaster and IMO the dedicated PoleMaster is very accurate and faster. I much prefer it over the other methods for the simpler computer guided visual alignment method used.? YMMV but I just go with the now (early drivers had issues under Win10) painless PoleMaster.? Chip |
|
Re: G11 cable management
Hi Dale,
I will say this about the tucked motors, they made my standard G11 with Gemini 2-mini and latest high-torque motors a lot narrower and surprisingly a lot quieter for some reason. Combined with the RAEXK the need to do a meridian flip to prevent a mount strike happens a lot less often while imaging. For this it was WELL WORTH the money IMO and I'm really cheap which is why I bought a used G11 in the first place!? I need to make a distinction here: I'm cheap which is not the same as being tight. Cheap people just want to get a good deal without hurting or limiting the potential of their gear. Cheap people know how to shop and identify the best possible gear and what a good deal is on it and then buy it. Tight people just keep buying inexpensive gear and suffer, endlessly upgrading until they become - cheap people!? Been there, done that! Chip ? ? |
|
Re: Polar Scope
开云体育I'll add my two cents on polemaster.? For those of us having arthritic issues with bending down and having your neck at an odd angle, the polemaster is the best ever.? One downer is having to use a laptop to polar align.? If you are in a group and people are trying to get their night vision going, a blazing laptop screen can be irritating.?? Chuck Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "tensor74@... [Losmandy_users]" <Losmandy_users@...> Date: 12/06/2017 5:55 AM (GMT-08:00) To: Losmandy_users@... Subject: [Losmandy_users] Re: Polar Scope ? I would have to agree with Brian. When you get the polar scope you have to align it. That gets frustrating. I had one I know. I went to the Polemaster for like $10 more and found it's a whole lot easier. Just my 2 cents. ? Greg S.
|
David Cochrun
to navigate to use esc to dismiss