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53 votes

Why don't climbers use electrically heated suits?

Edit: It turns out battery-powered heating in clothing actually is used on Mt. Everest: Hotronic makes battery-powered heated insoles that are used by Everest climbers, for example. Battery powered ...
talrnu's user avatar
  • 599
39 votes

Why don't climbers use electrically heated suits?

Firstly there's the weight issue - as Paparazzi commented, batteries are heavy! Then there's temperature - battery performance drops considerably in the cold And finally reliability - if your ...
Rory Alsop's user avatar
  • 24.9k
31 votes
Accepted

Require advice on power conservation for backpacking trip

I did use my phone as a mapping device a few times when I forgot my dedicated GNSS receiver at home (for peakbagging day-trips where I need to reach a specific point often under forest canopy and ...
Gabriel's user avatar
  • 5,055
25 votes
Accepted

Do electronics interfere with avalanche beacons?

Yes it does, especially mobile phones. I attended an avalanche course last year. The guide did a very simple demonstration. He powered his avalanche beacon on "send" mode, and put it on his ...
Giomsen's user avatar
  • 920
20 votes

Power for devices in cold and dark?

I think you have already listed your options: Wood-burning stoves with USB recharge ports, e.g. the one from Biolite. I have never used such a device, but according to the review it works, if slowly. ...
fgysin's user avatar
  • 13k
15 votes
Accepted

Are there any affordable night vision goggles that are good and available to civilians?

There are 3 main types of night vision equipment; Image intensification This is the type most commonly used by the military. It works by effectively amplifying the available light and may work in ...
Chris Johns's user avatar
  • 6,212
15 votes

Do electronics interfere with avalanche beacons?

I am the lead hardware engineer for Backcountry Access. Interference from personal electronic devices (PED) is very real, and it can range anywhere from minimal impact to severe. The reasons are a ...
David VanHorn's user avatar
15 votes
Accepted

Safest way to carry ebooks outdoors?

I would just get a waterproof case for whatever electronic device you have the books on and then a waterproof/impact resistant USB flash drive for the books. SD cards are more breakable and prone to ...
Charlie Brumbaugh's user avatar
14 votes

Power for devices in cold and dark?

If it's going to be windy wherever you're hiking, you could potentially bring a portable wind turbine. This model called "Shine Turbine" weighs 3 lbs and seems to be reasonably small. It ...
JonathanReez's user avatar
  • 3,007
14 votes
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Power for devices in cold and dark?

First things first I'm an EE so let me rant about units ;) I have modest power requirements but do need to top up a 2350 mAh headtorch battery every day and a smartphone every 2nd or 3rd day. The ...
bobflux's user avatar
  • 381
12 votes
Accepted

When considering GPS battery life where are the best options?

From your three options, a Dedicated GPS unit is going to be your best bet. Smart Phones barely last a day. If you're out of coverage, the phone will keep searching for network and battery will die ...
Desorder's user avatar
  • 2,338
12 votes

Safest way to carry ebooks outdoors?

I own a waterproof smartphone and it works as an E-book reader. I think there are also waterproof tablets, which will give you a bigger screen. I do not know whether there are waterproof dedicated e-...
Willeke's user avatar
  • 4,332
12 votes

Require advice on power conservation for backpacking trip

Consider buying a power bank with a solar charging panel; that lets you recover from an accident like leaving your phone on overnight with something consuming power. There are two main types on the ...
arp's user avatar
  • 221
11 votes

Require advice on power conservation for backpacking trip

How much margin due to charging inefficiency should I add when calculating the size of batteries needed for a trip? You need approximately 50% more due to inefficiencies while charging from a power ...
Jasper's user avatar
  • 1,107
11 votes

Require advice on power conservation for backpacking trip

It all depends on how (and how much) you use those devices. Personally, I can say more about DSLRs than phones, and with 2 different DSLRs on 5 tours (of 2-3 weeks) there was never an identical usage ...
Dynat's user avatar
  • 911
10 votes

How much less efficient is a solar charger when on a car's dashboard instead of in direct sunlight?

Shouldn't be less efficient at all - or at least, approximately as efficient. Solar panels generate energy utilising the band-gap structure inherent to semiconductor materials. This means that, to ...
QuantumBrick's user avatar
  • 3,379
10 votes
Accepted

How much less efficient is a solar charger when on a car's dashboard instead of in direct sunlight?

Yes, the solar panel will be a little less efficient on the dashboard than outside because: Wavelengths absorbed by the windshield. The windshield absorbs most UV, which does still contribute to the ...
Olin Lathrop's user avatar
  • 21.4k
9 votes

How do I calculate how many watts of energy I need when camping?

Power (watts) = Voltage (volts) * Current (amps) or Current (amps) = Power (watts) / Voltage (volts) So in order to determine the watts from amps, you also need to know the voltage of the devices. ...
topshot's user avatar
  • 2,012
9 votes
Accepted

How can I desalinate ocean water enough for cleaning or showering?

The problem is that desalinating water is hard; nearly desalinating it isn't much easier (it would be possible to design a bad reverse osmosis system but there isn't much market for that). Instead if ...
Chris H's user avatar
  • 26.5k
9 votes

Help me interface these two nautical devices

Garmin GPSMap 182C and Simrad TP32 share the same language (NMEA 0183), but they do not have enough in common to talk about. The NMEA sentences that the 182C can transmit are GPRMC, GPGGA, GPGSA, ...
bogl's user avatar
  • 191
8 votes

Are there human powered generators that draw power from body movement?

I get the stated question is generate power But if you are just looking for power a battery is very weight effective. One AA battery is only 0.8 ounce. A pair (1.6 oz) on low power will last ...
paparazzo's user avatar
  • 7,176
8 votes
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What features of a trail camera make it easier for photographing animals than other cameras?

Trail cameras are motion sensitive cameras that are secured to trees or other objects to capture animals or people passing by on a trail. They look like this, Source They have attachments for the ...
Charlie Brumbaugh's user avatar
8 votes
Accepted

What to look for in a portable generator?

There are basically two major types of generators for this situation: traditional and inverter generators. The expensive ones are the inverter generators, and the difference between the two types is ...
whatsisname's user avatar
  • 10.7k
8 votes
Accepted

How much margin due to charging inefficiency should I add when calculating the size of batteries needed for a trip?

The overall efficiency from a power bank to a smartphone battery is about 2/3, according to this source: https://www.powerbankguide.com/powerbank-capacity-explained/ The amount of energy a battery ...
Jasper's user avatar
  • 1,107
7 votes

How can I desalinate ocean water enough for cleaning or showering?

You linked to an industrial sized watermaker (75 gallons per hour) but they do come in smaller sizes for significantly less money. But think hard about how much water you actually need. I'd consider ...
Karen's user avatar
  • 4,244
7 votes

Is there a smartwatch/activity tracker lasting 20 days for a trek to Everest Base Camp?

If you mean a watch which will last 20 days while continuously tracking GPS, I think it unlikely. The lowest-power GPS modules (e.g. this one) run at about 20 mW. For 20 days' continuous use that ...
aucuparia's user avatar
  • 2,320
7 votes

What percentage of campground outlets are GFCI or RCD protected?

Presumably you won't be plugging your tent into any of these common North American RV dock connectors: 240V/50A on a NEMA 14-50 240V/30A on a NEMA 14-30 or 120V/30A on a "TT30" In those cases, ...
Harper - Reinstate Monica's user avatar
7 votes
Accepted

What map app would work well for via ferrata in the Dolomites?

OsmAnd is a popular choice for outdoor activities, using OpenStreetMap* (primarily). It works fully offline if you download the maps in advance. The only reason I don't use it is that my bike ...
Chris H's user avatar
  • 26.5k
6 votes

How do I calculate how many watts of energy I need when camping?

First question : are you walking or driving and do you need to camp for any length of time ? For short stay driving you take a second car battery and Amps x 11 = Watts or Watts/11 = Amps. It is 11 ...
mephisto's user avatar
6 votes

Is there a smartwatch/activity tracker lasting 20 days for a trek to Everest Base Camp?

I have not yet seen any GPS capable watch that has such a long battery live. GPS watches like Suunto Ambit and Garmin Fenix do advertise longer battery live, but these durations are only reached when ...
imsodin's user avatar
  • 21.7k

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