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MOBILE SOLAR POWER

IMTHIYAS VPROLL NO: 21S7-EEEGECI

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CONTENTSINTRODUCTIONSOLAR CELL TECHNOLOGYSOLAR PANEL DESIGNSOLAR PANEL CHARACTERIZATIONSYSTEM INTERFACE DESIGNCOMPARISON OF MSP WITH CURRENT

SYSTEMCONCLUSIONS

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INTRODUCTIONSupply sufficient electricity by reducing battery.PV is only renewable energy source to meet

challenge.PV power systems provide superior performance

in power generator compared with current system.

10x improvement in efficiency over existing technology.

It can easily integrated with war fighter's equipment.

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Solar Cell TechnologySJ GaAs Solar Cell used in this project were formed

by ELO(Epitaxial Lift Off) process.ELO process, a technology for making large area of

thin, flexible, high efficiency solar cells.

SJ GaAs cell have less efficiency, were applicable to system related issues.

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MSP cells produced average 500mA at SC, 0.98v at OC, 440mW at max. Power point.

Efficiency from 20-23%.

MSP panel.

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Solar Panel DesignPackaging of Solar Panel be Robust and

Rugged.MSP panel consist of 30 GaAs Solar cell

conjnected in series.Each array was laminated between 2 sheets

of transparent fluropolymer film.Size & Configuration were driven by size of

an average marine backpack.Maximum space of 10.5in x 17.5in.270 gm in wieght.

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Solar Panel Modelling & SimulationTo determine baseline & expectations for

system performance during Limited Objective Experiment-1(LOE-1).

Spectra are seen to vary in both intensity and distribution across the day.

Figure shows maximum power generation about 10W per panel.

Total energy yield is 50Wh/day.Effieciency is 21.5% at noon. Average

efficiency is 20.9%.

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Modeled performance of the MSP panels as a function of time throughoutone day at Fort Pickett, VA, on February 1, 2012

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Solar Panel CharacterizationOutput of MSP panel was measured in both

horizontal & solar tracking configurations shows in Figure.

Continuous green line displays power output when panel was flat, Red dot represents when panel was actively pointed directly at sun in Figure .

Total power produced by panel in flat configuration was 30.1Wh, efficiency was 18.7%.

Measured data are marginally less than Modelled Data.

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Solar insolation measured at Fort Pickett during the day

Power output measured from MSP # 6 in both a flat and solar-trackingconfiguration

I–V curves measured from MSP panel

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System Interface Design

MSP system components.MSP carrier

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MSP solar panel connected connected with BB-2590 to provide power & battery management, MPPT(Maximum power point Tracking).

Circuit designed for 15W, solar panel producing 28V @ OC & 23V maximum power.

Connector box & battery are housed in 100 round ammunition pouch using Modular light weight load carrying component(MOLLE).

Carrier also serve as protective case for MSP when not in use.

Not in use, panel can removed & stored inside carrier.

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Comparison of MSP With Current SystemMSP(Mobile Solar Power) mostly compared

with SPACES(Solar Portable Alternative Communications Energy System).

MSP SPACESConsists SJ GaAs Solar cells. Consists Copper Indium Gallium

Diselenide (CIGS).

Cell active area is 0.06sq.m. Cell active area is 0.7sq.m.

Panel efficiency is 19.6% Panel efficiency is 7.8%

Panel can recharge two BB-2590 batteries.

Panel can barely recharge one.

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ConclusionsMSP is useful for Warfighter’s and remote

area.Charging were less positive, system

efficiency attained approx. 17%.Need to improve Solar cell interconnect

issues.Panel will also designed to allow them to

connected in parallel so marine can charge a single battery.

Efforts must be placed on making technology rugged & affordable.

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References[1] R. Tatavarti, G. Hillier, A. Dzankovic, G. Martin, F. Tuminello,R. Navaratnarajah, G. Du, D. P. Vu, and N. Pan, “Lightweight, low costGaAs solar cells on 4 epitaxial liftoff (ELO) wafers,” in Proc. 33rd IEEEPhotovoltaic Specialists Conf., May 2008, pp. 1–4.[2] R. Tatavarti, A. Wibowo, G. Martin, F. Tuminello, C. Youtsey, G. Hillier,N. Pan, M. W. Wanlass, and M. Romero, “InGaP/GaAs/InGaAs invertedmetamorphic (IMM) solar cells on 4 epitaxial lifted off (ELO)wafers,” inProc. 35th IEEE Photovoltaic Spec. Conf., Jun. 2010, pp. 002125–002128.[3] C. Gueymard, Simple Model of the Atmospheric Radiative Transfer ofSunshine (SMARTS), ver. 2.9.5, 2009[4] [Online]. http://www.bren-tronics.com/bt-70791a.html, last access Feb. 2,2012.[5] [Online]. http://en.wikipedia.org/wiki/MOLLE, last access Feb. 2, 2012.[6] Y. Kishi, H. Inoue, H. Tanaka, S. Kouzuma, K. Murata, S. Sakai,M. Nishikuni, K. Wakisaka, H. Shibuya, H. Nishiwaki, A. Takeoka, andY. Kuwano, “New type of ultralight flexible a-Si solar cell and its applicationon an airplane,” in Proc. 22nd IEEE Photovoltaic Spec. Conf., Oct.1991, pp. 1213–1218.[7] J. Park, H. Ham, J. Lee, and T. Kim, “Thin film encapsulation for flexibleorganic solar cells,” in Proc. 35th IEEE Photovoltaic Spec. Conf., Jun.2010, pp. 001657–001659.

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