I have not doubt they make lots of great products, but man, I had bad luck with the Powerfilm SolarMax that I really wanted to like due to the power/ah/weight ratio. Got one last spring and during testing it stopped charging, submitted vids of issue, sent it back to Powerfilm, got it back weeks later. Unfortunately same problem. Every year I do an 8 day backpacking/qrp trip and really wanted this to work but glad I found out beforehand. Stuck with Lipo and oem kx2 batts. They were frustrated too, offered some other options but just too much weight. Maybe I'll try again in the future. Love all your vids, you do some really great work Julian.
This is a real bummer to read. Did they ever diagnose the problem? Perhaps I'll reach out then try to get more information. These kind of fails are good to know about. I've got 3 Lightsaver Max models. One from the original series had a failure after an overcurrent experiment. That's the only failure I've had. The other two are the newest version switch have a reset button. This allows the end user to reset the device after something bad happens. You're used case, this 8 Day hike is interesting. There's been a lot of chatter on the channel about a new battery build. An ultra small, tough SOTA summit compatible battery build for radios like the kx2, 705,... Perhaps it should get pushed forward to sooner rather than later. 73 Julian oh8stn
Just as an aside, Has anyone messed with Peltier junctions? Several in series on a plate with either a heatsink or water jacket and small 12v pump would generate consistent power from a camp stove. I recall there was an out fit making such beasts. Maybe I have found a new project for the winter. I have been slacking as late.
https://www.treehugger.com/firebee-power-tower-turns-any-heat-source-electricity-generator-4858110 https://thermoelectric-generator.com/product/wood-stove-thermoelectric-generator-rabbit-ears/ https://www.tegmart.com/ Apparently others have thought this to be a good idea as well. It would be tough to argue that any of these thermo-electric generators would be considered man-portable in either 50W or 100W versions.
True but compared to any source but solar it won't be man portable. When I used to hike I had a caddy for gear allowing me to haul about a hundred pounds so its actually a better option than a genny or wind. My thoughts are I have been out with several cloudy days where solar just won't do the job so alternatives become attractive. If your lugging a camp stove and can get 100 watts from it your ahead of the pack.
Unfortunately he really is no point to Peltier based power generation for a portable work. As I've mentioned many times in my videos, it's better to reduce the power consumption than carrying an extremely heavy generator and its fuel to power it. The amount of wood required to keep that generator producing along with the amount of work required to collect that wood is ridiculous. The titanium camping stove is a good source of heat, but isn't always running. Solar power is definitely the best option for men portable Ops at reasonable latitudes. At latitudes and time of year where there is no light for solar power, it might be better just to use a small generator. I have experimented with small Nitro RC engines turning small DC motors to get one or two amps out for charging. If you have a low current consumption station, and a high-density battery, you don't have to run the generator all the time, just often enough to top it up. For the rest of the world, solar power is always going to be a better way when combined with low consumption stations. 73 Julian oh8stn
I monkeyed with modifying a Rokon So it could run stationary and power a charger. With the wheel tanks you have considerable range and/or the ability to charge. A friend takes his output from a side by side up in Maine. He has panels on top too. Problem is a side by side can't go where a Rokon can. Could also go with a pedal genny just like the Coast watchers did in WW2.
I have absolutely no idea what a side-by-side is but that Rokon is absolutely magnificent. I can't wait until my eFat Bike upgrade project is done in the spring. Can carry a little bit more, while going even further. All solar powered. 73 Julian oh8stn
https://can-am.brp.com/off-road/us/...hicles.html?ds_rl=1278173&gclsrc=ds&gclsrc=ds They are a big craze now here. Not saying they are not a good time but here in the woods they are limited. Rokons or even a KLR would be better. I used to hit the woods with a Trials bike back in the day. Loved that Triumph but it was limited in fuel capacity.
I read the book "The Coastwatchers" when I was about 10 years old and it had a slight influence on my life. It led me to an interest in radio and the sea which later became a ham license at 13, NITROX open water diver, a degree in marine and ocean engineering, a merchant marine license and a commission in the USNR. Be careful what you let little kids read Here's the full length version of the book: https://www.amazon.com/Coast-Watchers-Feldt-Eric/dp/0140149260 The problem with the crank generator again is weight...it requires a lot of iron and copper to make decent amps. That said, you can go with a small crank generator to top off the battery as Julian states if you start your trip with a full tank of electrons.
Couldn't you just connect the radio battery somehow to the Rokon's battery and charge while driving instead of charging running stationary? I myself drive a Honda NC750X which hase a nice "frunk" (front-trunk): 22 liters of storage space where the gas tank usually is. On the NC, the gas tank is under the seat. This "frunk" is the perfect weather-proof place to store radio gear and charge batteries and USB power banks while riding. The NC's battery is directly in front of the "frunk", behind a removable panel. So installing USB sockets and power poles in that "frunk" is a breeze.
Getting back to the thrust of this thread...QRP and man-portable recharging...if one wants to grab some gain in a light weight package, rather than loaded verticals, 2 element wire beams (at 30 feet for 20M) and elevated dipoles are light weight options that can improve QRP ERP and directionality. Where trees are available I use a light-weight sectional casting rod to get my field antennas into the air, and it doubles as a grub-getter.