SEN - Your wholesaler for the full photovoltaic system range

By choosing the SEN group of companies, you are choosing a partner with over 30 years of experience in the industry on whom you can rely at all times. We have the claim to deliver quality in all areas of expertise and by this we do not only mean our premium mounting system SOL-50, but all SEN service, service and product areas.

About Us

Your PV wholesaler in the north

As a craft business and especially installation company in the photovoltaic branch you are more than ever in a gap between the end customer, whole sale, technical development, price calculation, energy politic, subvention, complaints, marketing activities, internal workshops and last but not least the professional installation on site. In these sophisticated times it is even more important to rely on a strong partner in all business fields. This includes quick response time, excellent credit ranking, uncomplicated order processing as well as an open mind for customers’ requirements and market demands.

1986 Foundation of SEN under the name Osmer Elektrotechnik by Klaus-Dieter Osmer and Jeanette Osmer-Soujon

1990 Construction of the first grid-connected photovoltaic systems as part of the "1,000 Roofs Programme

1990-2000 Realization of various projects in the field of building integration and other special solutions realized Special photovoltaic projects include the ADAC building in Hanover, Cafe Ambiente in Bremen and the Hundertwasser train station in Uelzen

2000 Development/distribution of the SOL-50 mounting system

2005 New construction of the SEN headquarters in Grasberg

2006 Change of name to specialist wholesaler SEN Solare Energiesysteme Nord 

2008 Introduction of the SOL-50 mounting system in the European market

2008 Launch of the planning tool SOLDraft 1.0

2010 Sales launch of the SOL-50 Solar-Carports 

2011 New construction of the warehouse / logistics centre with 6,000 m²

2014 Introduction of online shop with linked document database for mobile devices

2019 Klaus-Dieter Osmer retires and hands over the sole management to Martin Holzhüter

Klimaneutrales Unternehmen

Jedes Unternehmen verursacht CO2-Emissionen, ganz gleich, wie nachhaltig und sparsam es wirtschaftet. Klimaschutz bedeutet, alle Emissionen zu erfassen, um sie dann kontinuierlich zu reduzieren und zu vermeiden. Konsequent ist, wer alle unvermeidbaren Emissionen über ein Klimaschutzprojekt ausgleicht.

Seit kurzem sind wir ein offiziell zertifiziertes klimaneutrales Unternehmen. Als Großhandel für Solar, Montage- und Speichersysteme unterstützen wir ein Klimaschutzprojekt, welches uns sehr am Herzen liegt: Unsere CO2-Emissionen gleichen wir durch effiziente Kochöfen in Ghana aus.

Corporate Culture

Our dream

Together with our customers we want to make a significant and sustainable contribution to clean energy in a better world.

Our mission

Our customers are our top priority and we strive for lasting partnerships and cooperation with our customers. 

We want to grow together with our customers through our excellent product portfolio, our experience and know-how. 

The commitment and dedication of our employees is an essential pillar for the success of our company. 

We offer an attractive working environment. We are committed to a better environment with everything we do.

What we can offer you on top.


Become part of our SEN team! Find out about our current vacancies here.

to our vacancies


With seminars and practical workshops at SEN, you can keep your knowledge up to date.

Contact person

At SEN we place great value on personal contact and a dedicated contact person.

contact information