I'll second that since it clearly happens with the inverter and small
(17 Ah) 12 volt battery I use to power my studio lights outdoors. If
the lights won't be needed for more than a few minutes I turn the
inverter off.
Chuck Norcutt
Larry G. Griffin wrote:
> Long time lurker here. I've had some experience with inverters and
> batteries. An inverter will draw amps equivalent to about 10% of it's
> wattage rating just connected to the battery, whether you are using it
> or not. Back to lurking.
>
> Larry
>
> Simon Worby wrote:
>> You're thinking along the right lines, to my mind, but an inverter to mains
>> voltage and back to whatever the laptop wants (typically 15-18v DC) is
>> wasteful. You can buy a power pack for laptops that will take power direct
>> from 12v DC battery and convert it to the correct output for your laptop.
>> They're around £50 in the UK (70 US$).
>>
>> In your calculations, don't forget than even a leisure battery will only
>> really perform to about 50% of its stated capacity, and that the laptop can
>> have a significant draw. Nevertheless, you should be able to get 8 hours or
>> more use out of a decent 100Ah lead acid battery.
>>
>> Regards,
>>
>> Simon
>>
>> -----Original Message-----
>> From: Ken Norton [mailto:ken@xxxxxxxxxxx]
>> Sent: 16 July 2009 02:36
>> To: Olympus Camera Discussion
>> Subject: [OM] speaking of batteries
>>
>> On the "vacation", my wife is planning on completing the editing of her book
>> and really needs to have her laptop powered. However, we are going to be in
>> the "sticks" without electricity for a few days at a time. Anybody have any
>> recommendations--uh, make that AFFORDABLE recommendations?
>>
>> My budget for this would be the cost of a night or two of a hotel room. I
>> was thinking of a 12v deep-cycle battery, inverter and a charger.
>>
>> Rumor has it that the rewards for pulling this off are rather high. :)
>>
>> AG
>>
--
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