#21  
Old 26-05-2021, 02:56 PM
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Wilsil (Wilco)
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Originally Posted by bluesilver View Post
Just out of interest, what size USB power bank would you recommend looking at?
I will have to measure the eyepiece to find what size to get for that.
It all depends on the power draw from the heater and if you want to use it in a single night or multiple nights without charging.
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  #22  
Old 26-05-2021, 03:49 PM
bluesilver (Peter)
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I would only be looking to have one large enough for a single night use then charge it up if i plan to go out the next night.
For size wise i am still trying to find out what size to go for.
The diameter of the eyepiece is around 56mm, so quiet large around the middle.
Looking at photos, it looks to me that is where the dew heaters go on an eyepiece, never used one on an eyepiece before so could be wrong there.
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Old 26-05-2021, 05:01 PM
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Wilsil (Wilco)
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When you know which you need, get the amperage draw and multiply that by the amount of hours you are normally using it.
That will give you the minimum capacity of the power bank.
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Old 26-05-2021, 11:15 PM
astro-smart (Dale)
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Placement of the strap is key in the air column to prevent dew from forming. Some place inside the tube behind corrector or outside in front of it. Just make sure not to block image train.
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  #25  
Old 27-05-2021, 04:13 PM
bluesilver (Peter)
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Quote:
Originally Posted by Wilsil View Post
When you know which you need, get the amperage draw and multiply that by the amount of hours you are normally using it.
That will give you the minimum capacity of the power bank.
That makes sense now that you out it that way.
The USB dew heater draws 5W and a USB puts out 5V so basically 1A per hour
I should of mentioned that i was looking at a USB powered dew heater.
Something like a 10,000maH should be fine then.
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