USB powered dew heater strip

[Fordy_638]

Hi all,

I think the answer is no... but I'm looking for a dew heater that I can power from the USB port (5v) on my Celestron nexstar evo 925.

Does such a thing exist? I don't want to have to use power tank as it kind of negates the point of having an rechargeable internal battery for the scope.

Thanks in advance,

Aaron.

[cfpendock]

The normal maximum current you can draw from a USB socket is 500mA.  That means a max power of 2.5 watts.  Is that enough?  Maybe for a smaller scope, but I doubt it's enough for a 9", especially in our climate.

Chris

[Cornelius Varley]

Dew strips tend to be 12v and would draw more current than the 5v 500ma USB port could supply. Not a good idea.

[ChrisLX200]

Nope, and don't even try because you'll blow the USB port. You'll need an external power supply for this.

ChrisH

[Astroboffin]

As Chris says above DO NOT EVEN TRY THIS....can't stress that enough.....

AB

[laudropb]

Looks like you have got your answer. You did the right thing by asking for advice first.

[calli]

MAYBE a USB battery can give you enough power. They often offer 2.1A (10W or so) or even more and come with capacities of about 20000mAh. Much smaller than a Lead-bat tank and you can also power other/one another USB devices.

Carsten

[Fordy_638]

So disappointing, what were they thinking when designing a 'cable free' SCT? Obviously not about dew!!