• Zonnecel zonder bedrading goedkoper en veiliger (in Dutch)
  Rijkert Knoppers
  Article published in Technisch Weekblad about PV-wirefree concept, November 2002
  Download (pdf from scan, 171 kB)

• (K)eine gute idee (in German)
  Anne Kreutzmann
  Article published in Photon about the PV for Europe conference, November 2002
  Download (pdf from scan, 552 kB).

Flyers

• PV-wirefree - redesigning PV-systems
  Henk Oldenkamp, Irene de Jong
  Flyer presented at PV for Europe conference, Rome, October 2002
  Download (pdf, 1 MB)

Papers in descending chronological order

• PV-watchdog: a PV-module integrated sensor for clear, cost effective monitoring
  Henk Oldenkamp, Bernd Litzenburger, Lars Podlowski, Irene de Jong
  Paper presented at the 22nd European Photovoltaic Solar Energy Conference, Milano, Italy, September 2007
  Download (pdf, 361 kB)

• PV-Watchdog: Effektives Monitoring von PV-Modulen (in German)
  H. Oldenkamp, B. Litzenburger, L. Podlowski
  Paper presented at the Otti Forum, Staffelstein, Germany, March 2007
  Download (pdf, 490 kB)

• Maximum Power Point tracking performance under partially shaded PV array conditions
  Roland Bruenlinger, Benoît Bletterie, Matthias Milde, Henk Oldenkamp
  Paper presented at the 21st European Photovoltaic Solar Energy Conference, Dresden, Germany, September 2006
  Download (pdf, 170 kB)

• PV-wirefree: results of the proof-of-principle project and final system design
  Irene de Jong, Henk Oldenkamp, Esther Hebly, Bart de Boer, Hugo de Moor, Wim Sinke
  Paper presented at the 20th European Photovoltaic Solar Energy Conference, Barcelona, Spain, June 2005
  Download (pdf, 521 kB)

• Additional requirements for PV inverters necessary to maintain utility grid quality in case of high penetration of PV generators
  Henk Oldenkamp, Irene de Jong, Peter Heskes, Paul de Rooij, Hugo de Moor
  Paper presented at the 20th European Photovoltaic Solar Energy Conference, Barcelona, Spain, June 2005
  Download (pdf, 80 kB)

• PV-wirefree versus conventional PV-systems: detailed analysis of difference in energy yield between series and parallel connected PV-modules
  Irene de Jong, Henk Oldenkamp, Nico van der Borg, Bart de Boer, Hugo de Moor, Wim C. Sinke
  Paper presented at the 19th European Photovoltaic Solar Energy Conference, Paris, France, June 2004
  Download (pdf, 244 kB)

• PV-wirefree: bringing PV-systems back to their essentials
  Henk Oldenkamp, Irene de Jong, Bart de Boer, Wim C. Sinke
  Paper presented at the 3rd World Conference on Photovoltaic Energy Conversion, Osaka, Japan, May 2003
  Download (pdf, 98 kB)

• PV-wirefree: Redesigning and innovating the grid-connected PV systems
  Henk Oldenkamp, Irene de Jong, Wim C. Sinke
  Paper presented at PV for Europe conference, Rome, October 2002
  Download (pdf, 231 kB)

• PV-wirefree: Redesigning and innovating the grid-connected PV systems
  Henk Oldenkamp, Irene de Jong
  Poster presented at PV for Europe conference, Rome, October 2002
  Download(pdf, 488 kB)

• Next generation of AC-module inverters
  H. Oldenkamp, I.J. de Jong
  Paper presented at the 2nd World Conference and Exhibition on Photovoltaic Solar Energy Conversion, Vienna, 6-10 July 1998
  Download (pdf, 291 kB)

• AC modules: past, present and future
  H. Oldenkamp, I.J. de Jong
  Paper presented at the workshop Installing the future, 22-23 January 1998, Hatfield, U.K.
  Download (pdf, 490 kB)

• Nieuwe technologie zorgt voor prijsdoorbraak van OK4-100 mini inverter voor wisselstroompanelen (in Dutch)
  H. Oldenkamp, I.J. de Jong, C.W.A. Baltus, S.A.M. Verhoeven
  Bijdrage aan de Nederlandse Duurzame Energie Conferentie, 17-18 november 1997, Ede
  Download (pdf, 50 kB)

• Advanced high frequency switching technology of OK4 AC modules inverters break the 1 US$/Watt price barrier
  H. Oldenkamp, I.J. de Jong, C.W.A. Baltus, S.A.M. Verhoeven
  Paper presented at the 14th Photovoltaic Solar Energy Conference, Barcelona, Spain, 30 June - 4 July 1997
  Download (pdf, 105 kB)

• Reliability and accelerated life tests of the AC module mounted OKE4 inverter
  H. Oldenkamp, I.J. de Jong, C.W.A. Baltus, S.A.M. Verhoeven, S. Elstgeest
  Paper presented at the 25th IEEE Photovoltaic Specialists Conference, Hyatt Regency Crystal City, Washington D.C., May 13-17, 1996
  Download (pdf, 189 kB)

• Competitive implementation of multi-kilowatts grid connected PV-systems with OKE4 AC modules
  H. Oldenkamp, S.W.H. de Haan, I.J. de Jong, C.W.A. Baltus, C.F.A. Frumau, S.A.M. Verhoeven
  Paper presented at the 13th European Photovoltaic Solar Energy Conference, Nice, France, 23-27 October 1995
  Download (pdf, 126 kB)

• Test results of a 130W AC module; a modular solar ac power station
  S.W.H. de Haan, H. Oldenkamp, E.J. Wildenbeest
  Paper presented at the 1994 IEEE First World Conference on Photovoltaic Energy Conversion, Waikoloa, Hawaii, December 5-9, 1994
  Download not available

• Development of a 100W resonant inverter for ac modules
  S.W.H. de Haan, H. Oldenkamp, C.F.A. Frumau, W. Bonin
  Paper presented at 12th European Photovoltaic Solar Energy Conference, Amsterdam, The Netherlands, 11-15 April 1994
  Download not available

• PV-wirefree versus conventional PV-systems: detailed analysis of difference in energy yield between series and parallel connected PV-modules
  Henk Oldenkamp
  On-line power point presentation held at the 19th European Photovoltaic Solar Energy Conference, Paris, France, June 2004
  Open (html)

• PV-wirefree: bringing PV-systems back to their essentials
  Henk Oldenkamp
  On-line power point presentation held at the 3rd World Conference on Photovoltaic Energy Conversion, Osaka, Japan, May 2003
  Open (html)

Presentations in descending chronological order

• PV-wirefree versus conventional PV-systems: detailed analysis of difference in energy yield between series and parallel connected PV-modules
  Henk Oldenkamp
  Presentation held at the 19th European Photovoltaic Solar Energy Conference, Paris, France, June 2004
  Download (ppt, 11243 kB)

• PV-wirefree: bringing PV-systems back to their essentials
  Henk Oldenkamp
  Presentation held at the 3rd World Conference on Photovoltaic Energy Conversion, Osaka, Japan, May 2003
  Download (ppt, 5503 kB).

Reports in descending chronological order

• Haalbaarheidsstudie visuele indicator voor functioneren pv-modules (in Dutch)
  Henk Oldenkamp, Irene de Jong
  Public report with the results of the study into the feasiblity of the PV-watchdog, compiled for the Netherlands agency for energy and the environment (SenterNovem) to complete the feasibility project subsidized by the Nieuw Energieonderzoek-programma (NEO) (in Dutch), November 2005
  Download (pdf, 1750 kB).

• Duurzaamheid van fotovoltaïsche systemen op basis van geavanceerde silicium technologie (in Dutch)
  Erik Alsema
  Public report, Universiteit Utrecht Copernicus Instituut Sectie Natuurwetenschap en Samenleving, ISBN 90-393-3581-8, January 2004
  In this report an environmental Life Cycle Assessment (LCA) is made of advanced production technologies for crystalline silicium modules in comparison with the existing production technology. Among the investigated technologies are Solsilc solar-grade silicium, Ribbon-Growth-on-Substrate and Edge-defined Film-fed Growth. Also an assessment is made of new solar inverter types and novel roof-integration concepts, like PV-wirefree. Based on these analyses potential improvements in the environmental profile of photovoltaic systems are evaluated. Also energy pay-back times and CO2 emissions of the considered PV systems are calculated. Finally options for technological improvement are presented.
  Download (pdf, 1615 kB)

• Projectrapportage Haalbaarheidsstudie PV-wireless (in Dutch)
  Henk Oldenkamp, Irene de Jong
  Public report with the results of the study into the feasiblity of PV-wireless, compiled for the Netherlands agency for energy and the environment (Novem) to complete the feasibility project subsidized by the Nieuw Energieonderzoek-programma (NEO) (in Dutch), November 2002
  Download (pdf, 1750 kB)

Technical notes

• Detailed analysis of currents in PV-shunts
  Henk Oldenkamp
  Technical note which set the basics for PV-wirefree, 18 February 2002
  Download (pdf, 151 kB)