Tuesday, 18 August 2015
Wednesday, 20 May 2015
If you've been waiting for updates on my adventures with the solar kit, it's a bit like watching the kettle boil. Little to report so far.
I had some trouble with the V72 battery (the one that stores power from the solar panels); it seemed to be leaking power, with the lights on the charge indicator dropping overnight from 5 (100%) to 4 (80%) while sitting idle. Tony at Voltaic Systems helpfully responded:
"The most likely explanation is that the battery and battery capacity are actually totally fine, but the LED indicator is not working properly and looks like 4/5 LED's when really the battery is totally full. Another option is that the battery capacity really is leaking which is a serious (and rare) problem, and can be diagnosed by simply charging the battery to full and letting it sit idle for 7 or more days. If the LED's continue to drop over that time then it is draining power."
So, acting on advice, I charged the V72 battery to full. That was 4 days ago, and it remains full. No apparent power leakage so far. I think the problem might be that previous charges weren't quite full and I over-estimated the battery's capacity. This time I just charged till the LED indicator stopped blinking. It continues to not-blink.
I was able to charge up my MacBook Air (with the V72 battery partially unplugged from the solar panels) from 10% to 98%. That took about 80 minutes. Now I'm waiting for the MacBook power to run low again before recharging with the V72 battery. I work mostly on another computer and only take out the MacBook Air twice a week for lecture presentations; even after running one recorded Keynote slideshow, battery capacity remains at 52%. I haven't got anything else that needs charging at the moment! (I'm only testing equipment that I'll use in fieldwork.)
Tony provides additional tips about charging the Mac: "The power draw of the macbook is much greater than what the panel can provide, so even when it is plugged in to the solar panel the V72 will be slowly drained. The LED's drop down dramatically because the system is adjusting to the power requirements of the macbook, but there is still plenty of power left in the battery itself. This phenomenon is seen in all V72's. The good news is that all of the power inside the V72 is still available to go into the macbook, to bring it approximately 60%-100% full from 0% depending on the size of your screen, screen brightness, and power needs from the user while charging. For the best charging experience, recharge your macbook when it is asleep or turned off to stretch the battery capacity of the V72."
In short: watching the V72 battery for signs of power leakage; waiting for another device to run out of power before testing the V72 battery again. I told you: like watching the kettle boil...
Wednesday, 13 May 2015
I've used solar kits in the field before: photo on left is from my 2005 Cambodia fieldwork, and shows the (monocrystalline) solar panels catching sunlight from the roof of the car (with bemused 4-legged audience). The kit worked fine, but obviously wasn't too portable (I mean walkable, for ambulatory fieldwork). For Sarawak fieldwork (2009–2010) I used Thin Film PV panels: again, worked great but not made for ambulatory fieldwork (NB: Thin Film PV panels are also much lighter and apparently more energy efficient than the monocrystalline ones). In both cases, power was stored using heavy car batteries.
I'm off to fieldwork again, and this time I'm going to use a 20W folding solar panel from Voltaic Systems, which comes with a V72 laptop battery for storing the power. What I like best: rugged, compact, and portable! Kit that can be stuffed in my backpack and pulled out as needed.
I won't be starting fieldwork for months yet, but I like to test / check equipment early. I'm not much of a mechanic or engineer: my most sophisticated problem-solving tools are tape, superglue, and string. So I don't want to deal with equipment failure in the middle of fieldwork in the forest. I thought I'd document these "tests" a bit systematically, and blog on them here. I don't really have much time for this, but it doesn't require a lot of time to hang a solar panel and run power into a battery.
So here's how I hang the panel on my verandah (note plastic string):
This is really not the smartest way: the panel should be slanted to catch sunlight better, but there'll be a lot of shade under the forest canopy so I suppose this setup mimics (some) field conditions.
And it works...
Power flows into the battery from the solar panel via the red wire, and output to charge the iPad is with the USB cable. If you squint closely at the top left of the battery (note its size relative to the iPad) you'll see that the "charge indicator" (blinking red lights) is on, meaning that power is flowing into the battery from the panel.
Here's what the sky looked like at this time (8 am-ish):
Cloudy, as you can see. I'm facing northwest here.
By mid-afternoon (3:30pm), sunlight's pouring into the verandah, and I've got my solar lantern charging away too.
The lantern is strictly for home use; I'm trying to reduce electricity use. This lantern is too bulky, anyway, and not as efficient as the tiny Waka Waka Solar (flash)Light, which I'm definitely taking to the field with me. And why is the iPad still charging 7 hours after setup? Because I forgot to "on" the battery and didn't realise for several hours that the iPad wasn't charging! Note to self: remember to tap the "on" switch to start charging USB devices.
Results: iPad fully charged to 100% (from 60%), but need to drain it completely to check time needed for a full charge; took another few hours next day to fully "fill up" the battery from 80%.
Not bad: my solar kit works. Now to check charging times for different devices from 0 to 100% under various conditions of light and shade.
Now the question: why "cyborg anthropology"? Well, cyborg anthropology is "a framework for understanding the effects of objects and technology on humans and culture." As I've noted before, with all the high-tech equipment we (that is, I) lug to the field these days, anthropologists are cyborgs too. When I first started fieldwork, mobile phones were probably in the techno-cultural landscape somewhere in the world, but they weren't in the forest and certainly not in my backpack (I finally succumbed and bought my first mobile phone in 2004, and then only because somebody else paid for it). Nowadays... I once (accidentally) received text messages while fishing with the Batek. And if I wanted to, I could bombard Batek friends everyday with endless ethnographic questions from the comfort of my verandah: doing ethnography by remote control. (I don't, though: we don't have prolonged conversations on the phone, though we do talk) How all these technological changes affect the quality of ethnography produced is something worth thinking about.
Wednesday, 18 March 2015
Interested in Southeast Asia, the study of, the thinking about, the living in?
We have a new blog, mainly to showcase the work of our postgraduate participants in the International Summer School in Southeast Asian Studies, an annual two-week programme jointly-organised by Universiti Sains Malaysia in Penang (USM), the Institute of Asian and African Studies of Humboldt Universität zu Berlin (IAAW-HU), and Universitas Gadjah Mada in Yogyakarta (UGM). Check it out here.
I am one of the contributors, yes...
We've only just set it up; come back frequently.
Saturday, 31 January 2015
Here's a bit of Malaysian social history, as seen through the work of Aliran, Malaysia's oldest human rights group. Watch how information dissemination styles have changed since the 1970s, when the group was founded. Past 2010, all the images (and video) were shot by me.
Monday, 22 December 2014
The Eleventh Conference on Hunting and Gathering Societies (CHAGS 11) will be held in Vienna, September 7-11, 2015. The CALL FOR PAPERS has been announced here:
Deadline for submission of abstracts is February 20, 2015.
"All accepted session abstracts can be viewed online at our CHAGS 11 website. We mandate that ALL individual participants need to register and submit their abstracts via our online form, where papers can be directly submitted to a specific session. Participants may present ONE paper or poster as main authors and may be credited with co-authorship of one or more additional papers. The call will remain open till February 20. Shortly thereafter session organizers will select abstracts and administer their session to ensure final decisions about submitted abstracts by March. Notifications to individual participants will be sent out shortly thereafter. Early-bird registration will start in February. We have applied for funding for colleagues who are in need of travel support at various institutions but have no confirmation yet. There will be a separate announcement for this."
International Society for Hunter Gatherer Research (ISHGR) http://ishgr.org/
Tuesday, 16 December 2014
Over six months since I've posted anything in this blog. Well, I've been busy... Here's the most recent field photo: with baby Cantek and his aunt naʔAmit in Taman Negara last week (photo by Phillip Endicott).