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2010-12-21
, 14:04
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Posts: 752 |
Thanked: 284 times |
Joined on Sep 2010
@ Malaysia
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#42
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Originally Posted by ndi
I'm not saying replacing the battery totally with solar cells. But could solar cells be built into battery packs to continuous charge like in the calculator situation? Or imagine the back casing made up of solar cells?
N900 draws like nuts. Under heavy use, it drains faster than USB can charge it. And USB drives 2.5 W (5v 500mA).
Under less than desert conditions it might be that even low usage drains. N900 has 5 hour talk time under 3G. Add speakers or BT and solar can't even maintain a call.
Plus, if you talk you probably have poor incidence and a hand over it.
No way around it for now. You need big panel and not glued to phone.which makes it less portable than a second battery and an emergency pack.
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2010-12-21
, 14:50
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Posts: 3,617 |
Thanked: 2,412 times |
Joined on Nov 2009
@ Cambridge, UK
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#43
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Originally Posted by Joseph.skb
Why imagine?
I'm not saying replacing the battery totally with solar cells. But could solar cells be built into battery packs to continuous charge like in the calculator situation? Or imagine the back casing made up of solar cells?
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2010-12-21
, 14:51
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Posts: 701 |
Thanked: 585 times |
Joined on Sep 2010
@ London, England
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#44
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It is possible, but just not practical. Most of the time the phone won't be in a position to get much power at all from a solar panel on the back of the phone.
You can get external battery packs with solar panels on, which you can plug your n900 into and use to charge it, and with those you could leave them in a position to get lots of sunlight, but even so, most pocketable ones won't recharge very quickly by solar power.
You can get external battery packs with solar panels on, which you can plug your n900 into and use to charge it, and with those you could leave them in a position to get lots of sunlight, but even so, most pocketable ones won't recharge very quickly by solar power.
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2010-12-21
, 20:20
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Posts: 1,522 |
Thanked: 392 times |
Joined on Jul 2010
@ São Paulo, Brazil
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#45
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How many watts can be "captured" during normal usage by a kinetic generator? (an offcenter weight attached to the generator axis, or a freemoving magnet inside of a cylinder with a coil like those "shakelight" flashlights)
What about a piezo generator? (converts vibratioln and impacts into electricity)
And how about somthing like a peltier device running kinda like a solid state stirling engine off the waste heat? (when applying a voltage differential to a peltier it heats up one side and cools the other, but if you apply a temperature differential, heating one side more than the other, it will produce electricity)
What about a piezo generator? (converts vibratioln and impacts into electricity)
And how about somthing like a peltier device running kinda like a solid state stirling engine off the waste heat? (when applying a voltage differential to a peltier it heats up one side and cools the other, but if you apply a temperature differential, heating one side more than the other, it will produce electricity)
__________________
NOKIA N900: IT'S OVER NINE THOUSAND
How to use HotspotShield in the N900
Google Voice from outside the US + Free international calls: LEARN HOW HERE!!!
NOKIA N900: IT'S OVER NINE THOUSAND
How to use HotspotShield in the N900
Google Voice from outside the US + Free international calls: LEARN HOW HERE!!!
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2010-12-22
, 10:56
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Posts: 2,050 |
Thanked: 1,425 times |
Joined on Dec 2009
@ Bucharest
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#46
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Originally Posted by Joseph.skb
Please pay attention to the thread. All the math was for a phone-size surface for the purpose of a solar celled phone.
I'm not saying replacing the battery totally with solar cells. But could solar cells be built into battery packs to continuous charge like in the calculator situation? Or imagine the back casing made up of solar cells?
Originally Posted by TiagoTiago
Generally, a percentage (called efficiency) of the energy being moved. Not much. A watch is on a wrist, which is moved continuously, and it barely drives a watch.
How many watts can be "captured" during normal usage by a kinetic generator? (an offcenter weight attached to the generator axis, or a freemoving magnet inside of a cylinder with a coil like those "shakelight" flashlights)
What about a piezo generator? (converts vibratioln and impacts into electricity)
And how about somthing like a peltier device running kinda like a solid state stirling engine off the waste heat? (when applying a voltage differential to a peltier it heats up one side and cools the other, but if you apply a temperature differential, heating one side more than the other, it will produce electricity)
Piezo needs much electronics and the shocks would kill a lot of componenets.
Heat is poor because it's the last form if the energy as it decays. Peltier have a 50 percent efficiency when driven forward, and worse when backward, problem is they have some requirements, such as keeping the cold part cold and the hot part hot. Recouperating energy with such a poor temperature differential means the other size heats up before it produces anything.
The power dissipation from a phone is unlikely to produce enough to drive an LED. To get such energy levels, you need the likes of 70 degrees on one side and 20 at most on the other. When temperatures grow closer not only does power derop but efficiency is lower as well, so it isn't linear. A Stirling engine is but none of those is small or powerful enough to make a difference. The Stirling is likely to have 4 times the mass and volume of the N900.
Mechanical generators work, a human is perfectly able to generate the power. There are hand cranked emergency generators out there if you like. Not something you do anywhere though.
As for "shake" generators, they are the exact same as a hand crank, except all the stop and reverse direction of the hand is energy wasted, so it's a LOT less efficient from the human's point of view. Plus, drop it and you?s boned.
Buts, hand cranked generators are viable and they exist. Including as emergency packs, as radios, flashlights and the like.
__________________
N900 dead and Nokia no longer replaces them. Thanks for all the fish.
Keep the forums clean: use "Thanks" button instead of the thank you post.
N900 dead and Nokia no longer replaces them. Thanks for all the fish.
Keep the forums clean: use "Thanks" button instead of the thank you post.
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2010-12-23
, 10:40
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Posts: 1,994 |
Thanked: 3,342 times |
Joined on Jun 2010
@ N900: Battery low. N950: torx 4 re-used once and fine; SIM port torn apart
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#47
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Originally Posted by ndi
Well, my wrist watch moves for hour or two during the day, and it lasts for the whole 24-hour day, or more. If a human moves a lot, wrist-watch like cellular phone (cellular connection requires a lot of energy, just like GPS, WiFi, FM radio; remember it) could be viable.
A watch is on a wrist, which is moved continuously, and it barely drives a watch.
For the best result, all possible energy sources (movements of wrist, hand crank generators, solar panels on your bag/backpack) should be considered.
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2010-12-23
, 15:08
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Posts: 992 |
Thanked: 738 times |
Joined on Jun 2010
@ Low Earth Orbit
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#48
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Originally Posted by Wikiwide
All these will be obsolete when I perfect my sugar-cube size fusion generator.
For the best result, all possible energy sources (movements of wrist, hand crank generators, solar panels on your bag/backpack) should be considered.
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2010-12-23
, 15:22
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Posts: 752 |
Thanked: 284 times |
Joined on Sep 2010
@ Malaysia
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#49
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Originally Posted by kureyon
Fusion generator?
All these will be obsolete when I perfect my sugar-cube size fusion generator.
I was thinking we could do what hybrid cars do and charge the battery as you use the phone.
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2010-12-23
, 15:46
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Posts: 435 |
Thanked: 197 times |
Joined on Feb 2010
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#50
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What ever happened to Fuel Cell Batteries? Claimed to power a laptop on a single charge for up to 4 months. They were researching that several years ago, haven't heard of anything close to a final product yet 
Imagine charging your phone once a year, lol, we'd have a new problem? Remembering where we put the charger every year
Imagine charging your phone once a year, lol, we'd have a new problem? Remembering where we put the charger every year
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| Tags |
| battery life, carbon nanotube, research |
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But yes, a phone is more efficient. OTOH, what with Atoms and flash storage, it's getting more likely. Mini notebooks can now go 10 hours on small batteries. Just hold out a little longer...
N900 dead and Nokia no longer replaces them. Thanks for all the fish.
Keep the forums clean: use "Thanks" button instead of the thank you post.