I've been inspired by a video that's going around to talk about this topic, what if we wanted to make enough water through a dehumidifier to drink for our family of 4 and run the whole thing on solar power. Can we do it?
Simple answer is we can but it would be at such a giant cost.
link Makes 250ml/day [probably their best] Uses 540Wh/day. Would need about min of 270W of panels & 100Amph battery. Total cost $650 It also uses peltier's which are not very efficient.
link Makes 7L/day Uses 4000Wh/day Would need a minimum of 2000W of panels and 350Amph battery. Total cost $3300
So we can quickly see that making small amounts of water from dehumidifying air and powering that via solar panels becomes fairly expensive. Better we invested that money in storage tanks for rainwater that is always there, will have a far bigger capacity and will always replenish itself at some point.
Merely showing the 'best' case for it [its a terrible idea!] and most likely if you've not got much rain you sure as hell aren't going to be getting it out of the air accept for anecdotal cases like being in an area that gets sea breezes but little rainfall because of certain weather patterns.
I bet as someone who already lives off grid you could find a much better use for 2000W of panels [living north = more sun!] than making at best 7L of water lol.
Last Edit: Apr 19, 2016 15:31:35 GMT 10 by shinester
Also if you live in a dry area there's bugger all humidity to dehumidify.
Have you seen the "fog catchers" or whatever they are called, just fly wire or shade clothe that catches the moisture from fog, still gotta have fog though.
Yeah good point - I liked the idea of it, but we have bugger all humidity, or fog!!!!
Re the fog catchers, I'm guessing there is some sort of container to catch the water in?? Wonder how it would go on the coast in the winter??? I guess the condensation in the air may make it work - I see an experiment coming on!
I'm lucky enough to live in an area of China where it rains pretty much all year round - you can image my laughter when a "drought" was declared last year cos it hadn't rained for a few weeks...we caught the end of a typhoon soon after and plenty of places were flooded.
In fact, its been raining for pretty much the whole past ten days. I put a couple of bottles out yesterday to see how much water I could catch, and manager to fill them overnight. I'm now looking around to see where I can get hold of a couple of food-grade barrels to set up as collection points for garden watering.