Abstract: . . .  cells. 7. CONCLUSIONS From our survey of options for the use of photovoltaic solar energy systems in portable products we conclude that the field of application is relatively fresh and many aspects have not been explored thoroughly yet. We think that options exist because photovoltaic technolgy has proven to be feasible in higher power applications and because of the expected sharp decrease of costs of photovoltaic materials. However, requirements for consumer products are deviant from existing PV . . .
. . .  load. Each curve ends at a minimum battery capacity, below which the electricity demand can not be met without loss of the required load, i.e. the solar fraction will be lower than 95 %. In: Horvath, I. Li, P. and Vergeest, J. Proceedings of TMCE 2002,Forth International symposium April 22-26, 2002. Wuhan, P.R. China ISBN 7-5609-2682-7  . . .
. . .  Delft University of Technology, 2001 Wakisaka, K. and Kuwano, Y., Terrestrial applications of amorphous silicon solar cells, Progress in Photovoltaics: Research and Applications, Vol 6, pp 207217, 1998 Wenham, S.R., Green, M.A. and Watt, M.E., Applied Photovoltaics, Appendix B, Bridge Printery, Sydney, 1994. 160 Nominal array power (Wp) 140 390 Wh/day 120 100 80 215 Wh/day 60 170 Wh/day 40 0 50 100 150 200 250 300 350 400 450 500 Battery capacity (Ah) Figure 11. Optimized system designs with battery . . .
. . .  the batteries. At decreasing battery capacities increasing array power is required in order to meet the load. Each curve ends at a minimum battery capacity, below which the electricity demand can not be met without loss of the required load, i.e. the solar fraction will be lower than 95 %. In: Horvath, I. Li, P. and Vergeest, J. Proceedings of TMCE 2002,Forth International symposium April 22-26, 2002. Wuhan, P.R. China ISBN 7-5609-2682-7  . . .
. . .  TMCE 2002,Forth International symposium April 22-26, 2002. Wuhan, P.R. China ISBN 7-5609-2682-7 other types of PV cells or secondary batteries fit for consumer products are few and far between (Pettersson, 2000b). Given their system configuration solar energy systems in user products can be compared with solar home systems, a typical small-scale application of solar systems with chargeable lead-acid batteries for household electrification. In this example we will show the effect of load patterns on . . .
. . .  products can be compared with solar home systems, a typical small-scale application of solar systems with chargeable lead-acid batteries for household electrification. In this example we will show the effect of load patterns on the sizing of solar home systems in Indonesia as published by Reinders (199b). With the simulations program PVS (Econzept Energieplanung) we searched for the optimum of PV modules and battery size using monitored monthly irradiance data, which was 4.1 kWh/m2.day on an average. . . .
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