Laptop on Kerio & Inverter
Submitted: Monday, Aug 25, 2008 at 16:47
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61068
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4
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Member - Alastair D (NSW)
There have been questions in the past about the power drawn running laptops on
inverters vs DC supplies. I finally got myself organised and did the following measurements.
Laptop = ASUS A6R with 15.4" screen. Batteries fully charged. Playing a DVD.
Aux battery 12.6v
Kerio DC converter draw=2.2A
300W Powertech Inverter Pure Sine
Standby current 0.6A
Running laptop 4.1A
600W Powertech Inverter Pure Sine
Standby current 0.7A
Running laptop 4.0A
Aux battery 12.8v
The
inverters were in different vehicles hence the different aux battery voltage.
The Kerio draw was 0.1A when not connected to the laptop.
So the answer is
Kerio is about twice as efficient as running from inverter.
Having the laptop on for say 3 hrs would drain 6.6AH when on the Kerio and about 12AH when on the inverter. Neither should worry a good battery once off but would be a concern if not getting charged each day.
Hope this is useful.
alastair
Reply By: Member - Douglas M (SA) - Monday, Aug 25, 2008 at 18:44
Monday, Aug 25, 2008 at 18:44
Thanks Alistair,
Always guessed that to be the case but never tested it. Nice to know our set up is the most efficient.
Doug
AnswerID:
322150
Reply By: Ozboc - Monday, Aug 25, 2008 at 21:55
Monday, Aug 25, 2008 at 21:55
do you really have that much free time ?????
No offense - Just buy a cheap 12v charger/converter from jaycar or tandy --- there about $20 and go up to about 19.5 v ( adjustable )
you can run your laptop ALL day and night without fear of draining your battery -
inverters are really just a MASSIVE waste of energy and potentially dangerous to your batteries Longevity
Boc
AnswerID:
322198
Follow Up By: Mainey (wa) - Tuesday, Aug 26, 2008 at 08:36
Tuesday, Aug 26, 2008 at 08:36
Boc,
How on earth can charging a laptop battery be "potentially dangerous to your batteries Longevity" ??
Mainey . . .
FollowupID:
589223
Reply By: Ozboc - Tuesday, Aug 26, 2008 at 08:40
Tuesday, Aug 26, 2008 at 08:40
Sorry i would have thought this reply would be obvious as i am refering to THE CAR battery and not the laptop battery as the inverter drains the CAR battery and if left unchecked -- WILL shorten the life of your CAR battery ............
Boc
AnswerID:
322225
Follow Up By: Mainey (wa) - Tuesday, Aug 26, 2008 at 08:49
Tuesday, Aug 26, 2008 at 08:49
Boc,
Fortunately I don't use my "car battery" to run my Inverter, as I leave my inverter on only when charging or running 'stuff' I never get any hassles from the AGM DC batteries.
I would think anyone with an inverter would have their "house" battery system set-up to be charged as often as is required anyway.
Most if not all
Inverters have a low voltage cut-off mechanism and will not drain the battery system powering it anyway.
Mainey . . .
FollowupID:
589227
Reply By: Member -Signman - Thursday, Aug 28, 2008 at 10:14
Thursday, Aug 28, 2008 at 10:14
Would you suggest running the laptop with or without the battery installed??
AnswerID:
322604
Follow Up By: Mainey (wa) - Thursday, Aug 28, 2008 at 10:37
Thursday, Aug 28, 2008 at 10:37
Umm,
""Would you suggest running the laptop with or without the battery installed""
Which battery (vehicle or computer) are you meaning here ??
I'm not sure how it works with either battery missing.
Mainey . . .
FollowupID:
589648
Follow Up By: Member -Signman - Thursday, Aug 28, 2008 at 10:43
Thursday, Aug 28, 2008 at 10:43
Which battery do you think I mean ??
I don't think it would work real flash with the vehicle battery not installed- however, I did mean the Lappy battery...sorry to confuse you..
FollowupID:
589650
Follow Up By: Mainey (wa) - Thursday, Aug 28, 2008 at 10:54
Thursday, Aug 28, 2008 at 10:54
I placed the post because I did not know which battery you meant !
Because I did not think a computer would work with-out it's internal battery connected, the vehicle battery Voltage would be going DIRECT to where?
Hope not the Computer electronics, I think it would fry it!
Funny how my Computer works with-out the vehicle battery connected, yes I know that is not the answer you want but it's true.
Mainey . . .
FollowupID:
589651
Follow Up By: Member -Signman - Thursday, Aug 28, 2008 at 11:10
Thursday, Aug 28, 2008 at 11:10
Yes Mainey- a Laptop computer works just fine without the battery pack installed, when connected the the mains or external power supply.
Well mine do anyway- and they're Toshiba, HP and Acer...
Back to the original query..when using the Keiro type adaptor, would it be advisable to run with the (Laptop) battery installed or not ..
FollowupID:
589652
Follow Up By: Mainey (wa) - Thursday, Aug 28, 2008 at 15:23
Thursday, Aug 28, 2008 at 15:23
I admit I did not realize a laptop could be used running straight off the Inverter with it's own internal battery removed.
Now I know I don't need the installed computer battery, when it dies I won't replace it as I rarely use it away from the inverter or 240v at home.
Mainey . . .
FollowupID:
589678
Follow Up By: Member - Alastair D (NSW) - Friday, Aug 29, 2008 at 08:14
Friday, Aug 29, 2008 at 08:14
Signman,
I would leave the battery in place. It will get recharged at the same time as running the unit.
Once the laptop battery is fully charged it adds very little load to the power supply. With a decent 'car' battery running the laptop should present no problems whatever you do.
cheers
FollowupID:
589826
Follow Up By: WallCann Pty Ltd - Sunday, Aug 31, 2008 at 14:49
Sunday, Aug 31, 2008 at 14:49
Hi - Mark from the
Performance Shop here. We supply a 120 Watt (240 Watt peak) power inverter that connects to your cars cigarette lighter ($24.95 + postage). With your cars battery running it will recharge your laptop battery as
well as allowing you to be using the laptop at the same time. Also true for mobile phones, GPS, CD's and DVD's. As you are driving your cars battery is constantly recharging.
If you do not have the car running, then the typical vehicle battery has a minimum operating time of 1 to 2 hours, depending on the current needed for the appliance in use and the size of the battery. We advise that the operator start the vehicle every hour to recharge the vehicle’s battery system. This will prevent unexpected shut downs of equipment and will ensure that there is always sufficient battery capacity to start the vehicles engine.
You may want to refer to our
120 Watt 8ZED inverter page which will give you more specifications.
You'll also find a
photo of the unit on this ExploreOz page.
If you have any more tech questions re this, then feel free to email me at markm@wallcann.com and I'll get back to you
FollowupID:
590193