Topic

Practical use of the PowerPot during winter (and thermocoupler chargers).

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Kevin Burton BPL Member
PostedDec 29, 2012 at 3:30 pm

There are a few reviews here and there of the PowerPot.

http://www.thepowerpot.com

I'm mainly curious about how the PowerPot works in snowy conditions.

The deal with thermocouplers is that they work through temperature differentials
and a heated tent stove melting snow seem ideal conditions.

I think that if it could charge in 1-2 hours, and the conditions are right, that
you could use it easily in practice.

Winter camping is ideal usage:

1. If you're using a pulk the small amount of extra weight won't kill you.

2. You have plenty of cold snow to melt.

3. If you're using a hot tent setup you have a stove that you can keep running
for hours ANYWAY so might as well recharge your phone too.

The issue of course is charge time and maintaining the fire / pot.

I could easily see myself heating 3-5L of water for normal evening cooking (tea,
food, etc) and if I don't need the water I could just discard it outside and
only use it to charge my phone.

I checked the specifications and it seems that they provide 5V at 1000mA which
is the same as an AC charger.

https://www.thepowerpot.com/powerpot-v
http://apple.stackexchange.com/questions/61671/will-an-iphone-ipod-touch-charge-faster-when-connected-to-usb-3-0

Based on this I sould expect to charge an iPhone from 0% to 100% in about 2
hours.

This is a LOT of time in summer backpacking but not much so during winter. If
you get to camp at 4PM and setup camp you have about 4-5 hours until night.

If it takes 20-30 minutes boil 2L of water from snow, this would mean 4-6 times
you would need to discard the water and start again (to fully charge your
phone).

This seems realistic and certainly doable.

My main question is whether this works in PRACTICE so it would be nice to get
feedback from PowerPot owners.

PostedDec 29, 2012 at 3:49 pm

Hi Kevin
I had a fiddle with the Power Pot and came to your same conclusion.
That is about the best use I can think of apart from car camping, would be snow melting.
There is a cost attached to that in extra fuel because the part that holds the Peltier chip robs heat from the pot, however providing you do not have hot or boiling water it does put out some power.
Exactly how much I can't tell because I don't have a multi meter and I am too stupid to be able to use one , still it can charge my AA batteries.
So my "ideal" situation for it would be a multi day trip with one or two others when snow melting has to be done.
Otherwise one of those USB in and out batteries would be lighter.
Having said that , I have one for sale, $100 delivered to any Australian address.(pot and USB cable)
(don't bother from the US because postage would kill the deal)

Kevin Burton BPL Member
PostedDec 29, 2012 at 5:51 pm

Do you find that the warmer the water the lower the amperage generated ?

If this is the case then the amperage created as we approach boiling would lower.

So perhaps it will require 2x the amount of time or having to ditch the water half way to boiling and then use new snow.

Another options could be to keep the thermocouple outside where it is cold and somehow route warm water to it.

It's not like you're going to heat the outside to boiling and this way you get continual voltage.

PostedDec 29, 2012 at 7:24 pm

"Do you find that the warmer the water the lower the amperage generated ?

If this is the case then the amperage created as we approach boiling would lower."

Yes, as soon as the water gets hot ,not boiling, it stops charging my 4xAA but still has enough for very low powered LED lights.
That is why I would think it is OK for melting snow but it isn't designed for cooking
The "thermocouple" the Peltier unit, is built in to the base of the stove.
It works when one side is ho and the other cold.
Much larger than the one in the BioLite stove but the principle is the same.

Kevin Burton BPL Member
PostedDec 30, 2012 at 3:48 am

I had an idea last night that one could keep the Peltier unit OUTSIDE and mounted on the chimney.

One side would be ambient air temp vs the temp inside the chimney (hot).

Should work really well.

PostedDec 6, 2013 at 9:19 am

Just curious –

The small pot is 2.3 L and the kit weighs 1.25#.

What weight of fuel is burned over a 2 hour "charging cycle"?

Andy Stow BPL Member
PostedDec 6, 2013 at 9:34 am

Without running the numbers, I'm guessing based on efficiency that the increased fuel burnt will be heavier than carrying spare batteries.

I think this sort of thing only makes sense for when you're going to have a campfire.

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