| 00:17.28 | Oksana | kodomo_: I guess hope is here, but attracting more pre-orders (especially not-PayPal ones) would help. http://neo900.org/news/paypal-trouble-delays-project Also, if there is a way to force PayPal to release the money ( PayPal-customers telling PayPal that they are fully aware of risks and not going to chargeback; or some authority finding PayPal's requests for Neo900's operations too... |
| 00:17.30 | Oksana | ...intrusive), it would be great. |
| 00:32.55 | Oksana | Hmm, what about this one? Clear thin layer of crystal glass for solar power (a tad tricky to fit as modification to existing case)? Smartphone camera receiving signals (would only back-camera work for it, or would front-camera work, too?)? Would camera LEDs (two white and one red) be able to transmit signals? Software-wise, how difficult would it be to pull it off, would it require a... |
| 00:32.56 | Oksana | ...dedicated chip for LiFi? Hardware wise, do cameras and LEDs have the speeds required? |
| 00:32.59 | Oksana | https://en.wikipedia.org/wiki/Li-Fi |
| 00:39.25 | Oksana | How is Euro going? /It may be important for your final Neo900 price, correct? / http://neo900.org/estimate Not moving much... http://fx.sauder.ubc.ca/cgi/fxplot?b=EUR&c=USD&rd=731&ld=31&lm=1&ly=2016 |
| 01:17.29 | wpwrak | (li-fi) hmm, tricky. the flash controller is attached via i2c. but maybe one could modulate a fast signal via strobe (gpio). also, i'd be surprised if you could tweak the camera to operate at kfps speeds. (though i don't know if it's outright impossible) |
| 01:19.21 | wpwrak | (euro) with today's exchange rate, we "lost" some 3% since may 2015. in general, the rate has been bouncing between +3% to -6%. |
| 01:19.25 | wpwrak | see also http://fx.sauder.ubc.ca/cgi/fxplot?b=EUR&c=USD&rd=*&fd=1&fm=5&fy=2015&ld=31&lm=12&ly=2016&y=daily&q=volume&f=svg&a=lin&m=0&x=indx |
| 01:19.44 | wpwrak | >100% is bad news, <100% is good news |
| 01:20.43 | wpwrak | so, unpleasant but nothing devastating on that front |
| 01:22.19 | wpwrak | (solar) i think you need a 3D printer, to make a replacement bottom cover ;-) |
| 01:23.04 | DocScrutinizer05 | thanks! re photovoltaic, the theoretical maximum available for energy harvesting from sunlight is ~1000W per square meter. Breaking that down to the size of a PV cell that would fit on N900 case results in the conclusion that it's absolutely not worth it |
| 01:26.04 | DocScrutinizer05 | with a estimated efficiency of 10% for the average PV amorphous Si PV cell, you could get a *maximum* of 500mW |
| 01:26.06 | wpwrak | about 1 W. and probably not so nice side-effects if the neo900 is left in intense sunlight for the whole day. |
| 01:26.21 | DocScrutinizer05 | that too |
| 01:26.27 | wpwrak | https://en.wikipedia.org/wiki/Solar_cell_efficiency#/media/File:PVeff(rev160111).jpg is more optimistic :) |
| 01:27.29 | Wizzup | You could also just get some usb solar charger and connect that to the usb |
| 01:27.39 | Wizzup | (to the usb of the neo900) |
| 01:27.56 | DocScrutinizer05 | yep |
| 01:28.14 | wpwrak | Wizzup: there we have something that's a lot more reasonable. let the solar charger cook in the sunlight while the neo900 rests in the shadow |
| 01:28.19 | Wizzup | yep |
| 01:28.42 | Wizzup | for me it is pointless, since the netherlands doesn't get sun :) |
| 01:29.24 | wpwrak | i guess Oksana is thinking of long trips into the Australian desert :) |
| 01:31.47 | DocScrutinizer05 | even then it's mostly pointless to try and keep alive a phone with a 5*10cm solar cell which even theoretically can't get exposed to sunlight more than 50% of time |
| 01:32.37 | Wizzup | when it's a usb one, you can make it much larger and attach it to a backpack :) |
| 01:32.41 | DocScrutinizer05 | unless you plan to rest at daytime and move only during nighttime, it's even way less or way poorer efficacy |
| 01:32.42 | Wizzup | bagpack* ;) |
| 01:33.09 | DocScrutinizer05 | there are backpacks with integrated PV cells |
| 01:33.18 | DocScrutinizer05 | commercially available |
| 01:33.52 | Wizzup | exactly |
| 01:33.54 | wpwrak | wonders is putting up a solar array on my rear terrace could be of any use. i have some ~16 m2 there. probably prohibitively expensive, though. |
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| 01:35.46 | DocScrutinizer05 | economic break even is at around 10 years of operation here in Germany which has special high non market driven prices for solar energy |
| 01:36.41 | Wizzup | that is - if they last that long |
| 01:36.50 | Wizzup | of course, it's not just about economic break even :) |
| 01:37.51 | DocScrutinizer05 | here it's almost economically feasible to make money from buying cheap regular electricity for lamps to operate your PV and sell the expensive "solar" electricity |
| 01:38.16 | DocScrutinizer05 | ;-) |
| 01:38.28 | wpwrak | buy regular, feed into fake array, sell relabeled "solar" ? :) |
| 01:38.40 | DocScrutinizer05 | the inverse of the infamous solar powered flashlight |
| 01:38.52 | DocScrutinizer05 | wpwrak: this works |
| 01:39.03 | DocScrutinizer05 | money from nothing |
| 01:41.32 | DocScrutinizer05 | I guess a cheap rarely used way to improve efficiency resp TCO ratio of PV would be to use mirrors to amplify / multiply the amount of light on a PV panel |
| 01:42.51 | DocScrutinizer05 | regular PV Si cels should be able to cope with at least twice to 3 times the maximum solar energy per area |
| 01:43.12 | wpwrak | i wouldn't be surprised if they malfunctioned if you suddenly had a lot more light than peak sun output :) |
| 01:43.24 | DocScrutinizer05 | nah |
| 01:44.29 | DocScrutinizer05 | actually on spacelab etc the use lenses to 'bake' PV cells punctually to regenerate them and 'cook out' some negative effects from cosmic wind or whatever |
| 01:45.01 | wpwrak | yes, but they're designed for that :) |
| 01:45.05 | DocScrutinizer05 | the only think you need to take care about is temperature |
| 01:45.11 | DocScrutinizer05 | thing* |
| 01:45.21 | wpwrak | i mean, you have the whole system, not just the PV element |
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| 01:46.35 | DocScrutinizer05 | using IR-transmissive mirrors would greatly reduce any problem with temperature arising from focusing mirrors. Active cooling can do the rest and even serve as second purpose means to harvest heat for hot water etc |
| 01:47.55 | Oksana | is in favour of passive cooling, but it all depends on circumstances. Passive is better for not-focused, quiet cases |
| 01:48.31 | DocScrutinizer05 | plus >90% of time, you don't nearly have the max solar power. In that situation multiplying the low light to reach nominal maximum will go a long way without *any* worries about side effects |
| 01:51.22 | DocScrutinizer05 | a normal PV cell should withstand a 100°C easily I guess. So a sort of water 'cooling' could 'passively' (without external power or active elements like electronics etc) move the mirrors to defocus them as soon as the water starts boiling and thus builds up vapor pressure |
| 01:53.52 | wpwrak | seems that you want 25 C: http://www.solar-facts-and-advice.com/solar-panel-temperature.html |
| 01:55.27 | DocScrutinizer05 | >>In some cases the heat factor can reduce your output by 10% to 25% depending on your specific location.<< not exactly negligible but not too bad either |
| 01:56.25 | wpwrak | yes, but that's without artificially boosting it, as you propose |
| 01:56.34 | DocScrutinizer05 | but yeah, 100°C is maybe too hot |
| 01:57.54 | DocScrutinizer05 | anyway the usual case is you don't even have 100% of solar energy and you want to boost it to just reach the projected maximum nominal power |
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| 02:36.29 | DocScrutinizer05 | are the usual commercially available PV panels equipped with a IR reflective coating? |
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