Hi Ivor,

In the field as long as it permitted, most photographers use a  Honda generator, but depending on whether the camera will be left unattended or not during the week would determine the size of the generator, for example a small silent Honda 20i will run continuously for 8 hours before requiring a refill.
It's also very quiet at only 54db (Quiet suburb, conversation at home. Large electrical transformers at 100 ft)

There are Lithium batteries used in the flash industry like the LP-800 this has 3 universal sockets and at 12,000mAh they  last 8 times longer than the D200 1500mAh batteries or 1600 shots

If you know how long a new, fully charged Nikon battery last in time lapse then you can see if the LP-800 would work for you. 

Neither solution is cheap both will set you back around £1000 +

Kind Regards


Lawrie Hope
Sales & Rental Manager

Unit 27 Cremer Business Centre
37 Cremer Street
London, E2 8HD
m. 07894 669166
t. 020 7033 7371
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w. www.peartreephotoshop.co.uk

-----Original Message-----
From: AHFAP, for image professionals in the UK cultural heritage sector [mailto:[log in to unmask]] On Behalf Of Ivor Kerslake
Sent: 19 June 2015 12:15
To: [log in to unmask]
Subject: External power source for Nikon

Hi all. I am in the middle of a prolonged timelapse shoot using a Nikon D200 with AC  adaptor. My problem is the constant interruption of mains power  which turns off the camera. Does anyone know of an independent free standing source of electricity that would last for up to a week say ? I presume that the natural history film makers must use something when they're working in the field.
Many thanks.