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power supply


Guest speed
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Hi just wondered what members are running their scopes and accessories off ? I have a jump starter device at the moment which is great for powering the mount but I want to rum a dew controller as well

Any thoughts?

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Guest Kheldar

I use an 80ah one and it runs my mount, cooling fan and dew heater bands fine. I've yet to try an inverter and my laptop on it but that is my next plan.

 

Don't buy the inverter Felix, get a car adaptor for your laptop and run it straight from 12V :)

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Don't buy the inverter Felix, get a car adaptor for your laptop and run it straight from 12V :)

Yep, thats what I do too.

Maplins, amazon or ebay sell 12v laptop supplies.

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Don't buy the inverter Felix, get a car adaptor for your laptop and run it straight from 12V :)

Will it not drain the battery really quickly? I am sure someone said that to me once-can't think who though.

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I use an 80ah one and it runs my mount, cooling fan and dew heater bands fine. I've yet to try an inverter and my laptop on it but that is my next plan.

 

 

i have already tried that, waste of time and money :(  got quite an expensive one but really was not a success.  I run mine from battery

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Guest Kheldar

Will it not drain the battery really quickly? I am sure someone said that to me once-can't think who though.

 

First up, £10 cables vs expensive invertor :)

 

Secondly as per Perky's comment above, she's tried at least three "good" ones in the field and they just don't seem to be happy

 

I'm sure there's arguments for, but see point 1 :) Your laptop power cable converts AC to DC to start with anyway (the brick) so why make a simple thing complicated?

 

As to battery drain, no, a DC power cable will not drain the battery faster. Handy hint, take the battery out the laptop when you go out for the night :)

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Guest Kheldar

Man I am lost Stephen! So do you have any recommendations/links to a suitable cable please? Then I know which one you are talking about :D

 

Google "YOUR MAKE OF LAPTOP HERE" then "YOUR MODEL OF LAPTOP HERE" then "car adaptor"

 

Here's one for a random HP G6 - http://www.ebay.co.uk/itm/PSU-In-Car-Charger-ADAPTOR-for-fits-Laptop-HP-PAVILLION-HP-G6-1359EA-/320960733781

 

:D

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As to battery drain, no, a DC power cable will not drain the battery faster. Handy hint, take the battery out the laptop when you go out for the night :)

I didn't mean that it drains the laptop battery quicker I meant someone told me that plugging my laptop into the 80ah battery will drain the 80ah battery too quickly and that's why they were suggesting the inverter.

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Guest Kheldar

I didn't mean that it drains the laptop battery quicker I meant someone told me that plugging my laptop into the 80ah battery will drain the 80ah battery too quickly and that's why they were suggesting the inverter.

 

I call balls on that one but I'm not a sparky

 

The invertor takes 12V DC steps it up to 240V AC (this creating heat and noise = energy use = drain on battery) and then outputs it. Your laptop (AC) power cable then converts that 240V AC back down to 12V DC (or 14V or whatever your laptop needs) (this creates heat, put your hand on the power cable brick = energy use) ... so my argument is an invertor uses MORE battery than the regular DC cable :)

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correct i had 3 inverters from work.... one at 300w, was not enough and would not power battery, one at 600w, i think that one blew up, the 1000w did work but you might need a mortgage


to buy that one.  And there was is a big drain on battery.  If you would like to try its still chucked in the cupboard here..... would not recommend it thought :wacko:

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correct i had 3 inverters from work.... one at 300w, was not enough and would not power battery, one at 600w, i think that one blew up, the 1000w did work but you might need a mortgage

to buy that one.  And there was is a big drain on battery.  If you would like to try its still chucked in the cupboard here..... would not recommend it thought :wacko:

I completely agree. I'd be surprised if 12 v > 240 v > laptop voltage was 80% efficient. Some of the new boost converters are around 95% efficient.

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Inverters generate quite a bit of heat, most have cooling fans. This is just a waste of energy, plus you are messing about with 240v, which has no earth. Get it damp and your'e asking for trouble. 


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Hi David

Power in the field all depends on what scope and accessories you want to run and for how long.

Those with 110ah packs are running tons of things off them, mount, camera, dew bands, lappy etc etc.

But batteries that size tend to be a bit heavy.

However if you are just running a mountplus say one dew band for a vouple of hours a bog standard 17ah -20ah jump starter will be ok and will save you some back ache.

I ran a Celestron Cge mount, with c11 on top, plus 2 dew bands from a 17.5ah pack for years and provided it was charged up before each session I was good for an all nighter.

If you can though its always best to get something with a bit of reserve, say 20plus ah.

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