Yeah - so for commuting I replaced my regular bike water bottle with this. The key is the screw on cap. It removes the temptation. I can have a drink if I'm stopped and have both hands free.
There are enough stop signs and stop lights around so that I have no problem with the current setup. I'm not in a race. No big need to eat or drink while on the bike. And with our 90 degree mornings and evenings and 100+ degree days, I slam down about 12 ounces of cold water before heading out anyway. That slows down the onset of thirst pretty well.
Wow. Do you have a picture of your setup with cooler bags?John and Cecil wrote: ↑Jun 18, 2018 4:30 pmWe have 2 cooler saddle bags for 100 degree days. We load them up with ice water and both Cecil and I have evaporative cooling vests which we soak every 30-45 mins in the ice water. They worked really well on the motorcycle by drawing the heat out of you so I expect them to work well on the ebike too. Before I got one for Cecil he would squirm whenever we stopped at a red light, after he started wearing his cooling vest he never squirmed in his box again when riding out in the hot sun. It worked so well for him that I got one for myself. I have to build him a little convertible bimini top this year too.
They are ScootR Logic saddlebags which are fairly inexpensive and lightweight insulated cooler bags. I have them mounted on Cecil's hardwood custom carrier, however they could probably be mounted as small pannier bags on the side of the rack as well. I believe the pair is rated to hold a 24 pack of 12 oz cans. They are nice for carrying gear too because since they are cooler bags they are also waterproof.
A quick survey of two similar small coollers shows a 4-5 amp draw or about 50 watts. That seems tolerable for a short trip, but then on a short trip, it isn't needed as much. On a long trip (more than two hours for instance), that kind of power draw seems a bit much. Though you could almost make up for it with a 2ft x 2ft 50 watt solar panel.amberwolf wrote: ↑Jun 21, 2018 12:10 amYears back, I had a peltier-type fridge with about a cubic foot and a half space inside, and IIRC it took 2 or 3 amps or more while running off it's 12v power supply; it ran a lot more than not, to keep stuff just about 60F inside, in a 90F+ environment. Adding a 5"+ computer case fan to cool teh peltier heatsink helped, letting the temperature get down another 10 degrees to around 50F, but power usage was a bit higher due to the fan, and it didn't change the duty cycle.
Might be some better stuff out there these days. More / thicker / better insulation would help; this thing was plastic with about 1" of styrofoam inside its' walls and door.
Yeah. I knew that "almost 50 watts" was probably optimistic, but I didn't realize it was that optimistic. A little digging and I'm inclined to agree that with a moving system you'd be doing well to get half the rated output on average.amberwolf wrote: ↑Jun 21, 2018 1:08 amAFAIK, a "50 watt" panel will only get you 50w max at the best perfect illumination conditions at noon on the equator.
If you need actual 50w at the load, you need to figure the efficiency hit between the panel and the load in whatever conversion electronics there are, and in the panel itself under teh conditions it'll actually be being used in, including the lighting and temperature. You might need at least 2-3 times as much panel as you think.
Then it only works in good direct sunlight, so it doesn't power anything if you are on your way home in evening/dark, and the cooler warms up after that point.
I'm guessing its the whole change of state thing. It take a lot of heat to change water from ice to liquid. The heat goes there first and only after the ice is liquefied does the now liquid water actually begin to warm past 32 deg F. Hot liquids don't have that change of state factor working in their favor. They start liquid and end up liquid. The best they can do is take advantage of a wider temperature differential. For instance if you start with super-hot 185 deg F liquid, it can cool 65 degrees and still seem moderately hot. But if you start with cold water, no ice at just above freezing. - 32 deg F - when it warms just 40 degrees, then it is no longer "cold."