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mission:tech:odyssey [2014/12/22 10:30] – chronomission:tech:odyssey [2016/08/09 19:17] (current) – Updated VFCC links chrono
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 Rational thinking will ultimately come to the conclusion, that increasing efficiency and diversity is not going to be enough to keep a fully self-sustainable and autonomous state. Therefore, all power consuming use cases and their underlying technology, have to be constantly monitored by the SKU and optimized to fit into the conservative power budget of 50W maximum consumption for 10 hours per day (500Wh/day). Rational thinking will ultimately come to the conclusion, that increasing efficiency and diversity is not going to be enough to keep a fully self-sustainable and autonomous state. Therefore, all power consuming use cases and their underlying technology, have to be constantly monitored by the SKU and optimized to fit into the conservative power budget of 50W maximum consumption for 10 hours per day (500Wh/day).
  
-Modern technology like LED's, embedded SoC devices and highly efficient switch-mode power supplies make this possible and have been developed/tested for the last 12 month.+Modern technologies like LED's, embedded SoC devices and highly efficient switch-mode power supplies make this possible and are being continously evolved and tested.
  
 ==== Solar ==== ==== Solar ====
  
-Since solar power is the primary energy source of the Odyssey, the primary design considerations have been efficiency and reliability. The biggest challenge was to find solar panels with at least 20% efficiency that actually would physically fit on the constrained roof space of the Odyssey. +Since solar power is the primary energy source of the Odyssey, the primary design considerations have been efficiency and reliability. Although there seem to be [[https://apollo.open-resource.org/mission:log:2014:11:28:using-nanopatterns-from-blu-ray-discs-to-boost-pv-solar-conversion-efficiency|advances in solar technology]], biggest challenge was to find solar panels with at least 20% conversion efficiency that actually would physically fit on the constrained roof space of the Odyssey. After a long and thorough market analysis, the following components have been selected and obtained to supply the Odyssey with solar energy.
- +
-It seems that these days, most panels are produced in a very limited subset of available sizes, streamlined for the grid-feed solar market, which are too long to be mounted on the roof of a regular vehicle and would stand over the sides. The supply market for grid-feeding solar systems is huge but there are only a few (mostly smaller) companies offering off-grid solutions. After a long and thorough market analysis, the following components have been selected and matched to supply the Odyssey with solar energy.+
  
 === Panels ===  === Panels === 
 +
 +It seems that these days, most panels are produced in a very limited subset of available sizes, streamlined for the grid-feed solar market, which are too long to be mounted on the roof of a regular vehicle and would stand over the sides. The supply market for grid-feeding solar systems is huge but there are only a few (mostly smaller) companies offering off-grid solutions. 
  
 ** Mobile Technology MT-ST110 ** ** Mobile Technology MT-ST110 **
  
 ^ Parameter ^ Single Panel ^ Combined ^ ^ Parameter ^ Single Panel ^ Combined ^
-| Nominal Peak Power @ 1kW/m² RSO (25°C) | 110 Wp | 330 Wp |+| Nominal Peak Power @ 1 kW/m² RSO (25°C) | 110 Wp | 330 Wp |
 | Efficiency | 20% || | Efficiency | 20% ||
 | Short-circuit current| 6.1 A | 18.3 A | | Short-circuit current| 6.1 A | 18.3 A |
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 | Source | [[http://www.buettner-elektronik.de/|Büttner Elektronik]] || | Source | [[http://www.buettner-elektronik.de/|Büttner Elektronik]] ||
  
-<WRAP round tip>The panel's surface is a little bit larger than the actual cell surface. The following calculations were based on a combined photo-active area of 1404x1404 mm, by measuring and multiplying the size of a single cell. +** Calculations & Simulation ** 
-</WRAP>+ 
 +The panel's surface is a little bit larger than the actual cell surface. The following calculations were based on a combined photo-active area of about 1.825 m², by measuring and multiplying the size of a single cell. 
 + 
 +<x 14>0.13*0.13*108 = 1.825 m²</x>
  
-<x 14>1404*1404 = 1.971 m²</x>+Assuming a maximum of 1000W of energy per m<sup>2</sup> delivered by the sun on the planet's surface, the Odyssey's available combined photo-active roof surface (1.825 m²) can theoretically receive a maximum of 1825 W<sub>p</sub> (Watt Peak), in peak sunlight: 
  
-Assuming a maximum of 800W of energy per m<sup>2</sup> delivered by the sun on the planet's surface, the Odyssey's available combined photo-active roof surface (1.971 m²) can theoretically receive a maximum of 1577 W<sub>p</sub> (Watt Peak), in peak sunlight: +<x 14>1.825*1000=1825 Wp</x>
  
-<x 14>1.971*800=1577 Wp</x>+In mid-summer at peak sunlight (1000W/m² Global Solar Radaition), the Odyssey will receive about 1.8 kW of solar energy on all cells. The conversion efficiency for these modules is rated at 20% by the manufacturer. Knowing that, it's possible to calculate the maximum amount of power the Odyssey can harvest with her finite roof-space at 20% module efficiency. Of course, the cell efficiency will be slightly higher:
  
-In peak sunlight, the Odyssey will receive about 1.5 kW of solar energy on all cells. The conversion efficiency for these modules is rated at 20% by the manufacturer. Knowing that, it's possible to calculate the maximum amount of power the Odyssey can harvest with her finite roof-space at 20% module efficiency. Of course, the cell efficiency will be slightly higher:+<x 14>1825*0.2 = 365 Wp</x>
  
-<x 14>1.971*800*0.2 = 315 Wp</x>+Now for the sake of going through it, lets further assume a luxuriously sunny, clear-sky day and the opportunity to harvest 4 hours at maximum peak output, the solar power-budget will accumulate about 1460 Wh (110 Ah).
  
-Now for the sake of going through it, lets further assume a luxuriously sunny, clear-sky day and the opportunity to harvest 4 hours at maximum peak output, the solar power-budget will accumulate about 1260 Wh (95 Ah).+<x 14>365 * 4 = 1460 Wh \approx 110 Ah</x>
  
-<x 14>315 * 4 = 1260 Wh \approx 95 Ah</x>+Although the panels will not stop converting energy after the peak four hours, the current will probably drop soon enough. As of now there is still not enough data to conclude anything but simulations with the [[lab:ucsspm|UCSSPM]] in the [[https://apollo.open-resource.org/flight-control/vfcc/|VFCC]] are helping to get an [[https://apollo.open-resource.org/flight-control/vfcc/dashboard/db/odyssey-solar-power|estimation]].
  
-Although the panels will not stop converting energy after the peak four hours, the current will probably drop soon enough. As of now there is no data to conclude anything. +{{:lab:ucsspm-test-dashboard.jpg|Odyssey solar metrics on VFCC dashboard}}
  
 === Solar Charging Controller with MPPT === === Solar Charging Controller with MPPT ===
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