# The perfect website for solar companies, built for holtz-partner.com > URL: https://4eck-media.de/en/blog/the-perfect-website-for-solar-companies-built-for-holtz-partner-com/ > Language: en > Description: The best website for a solar company has a harder job than most corporate websites: it has to explain a business model. Roof renovation at no cost to the owner, a lease paid as a … --- The **best website for a solar company** has a harder job than most corporate websites: it has to explain a business model. Roof renovation at no cost to the owner, a lease paid as a one-off sum, returns from ongoing PV projects – anyone reading this for the first time will have questions. A good website answers them before the prospect drops out, and guides them to the right offer. A modern website in this field has five central jobs to do: - It makes three different offers immediately distinguishable: renovation, leasing, investment. - It proves experience with real project data instead of advertising promises. - It calculates the prospect’s specific benefit for them, before they even make an enquiry. - It works just as well for farmers on a smartphone as it does for investors on a desktop. - It is built cleanly from a technical point of view: fast, accessible and readable for search engines and AI systems. Our case study for [holtz-partner.com](https://holtz-partner.com/) shows what this looks like in practice: a complete relaunch including a rebrand for one of the most experienced providers of rooftop solar installations in Germany. ![Website-Relaunch im Vorher-nachher-Vergleich: die neue Holtz & Partner Seite gegenüber der alten HK Solartec Website](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-website-relaunch-vorher-nachher-solartec.avif "Holtz & Partner – Website-Relaunch im Vorher-nachher-Vergleich") ## Starting point: new brand, strong figures, outdated website Behind Holtz & Partner stands the team of HK Solartec from Broderstorf near Rostock. Since 2012 the company has delivered over 700 solar projects, covered more than 2 million m² of roof space and installed over 300,000 kWp of total output. The model: owners of large roof areas from 500 m² upwards lease their roof for a photovoltaic system, receive a one-off lease payment when construction starts and, if needed, a free roof renovation beforehand. Investors take a stake in ongoing projects. The old website under the HK Solartec brand conveyed little of this. A dark layout from a different generation of web design, long blocks of text, no clear separation of the three offers. The move to the Holtz & Partner brand was also the moment to rebuild the digital presence from scratch. That produced the following tasks for the relaunch: - The three offers – roof renovation, roof leasing and investment – needed their own, clearly separated pages. - The experience from over 700 projects had to become visible and verifiable. - Prospects had to be able to calculate their potential lease payment themselves. - Six very different target groups had to recognise themselves, from farmers to private investors. - The new brand presence had to feel modern without losing the credibility of an established business. ![Startseite der Holtz & Partner Solar-Website im hellen und dunklen Design auf zwei Tablets](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-startseite-webdesign-dark-light-mode.avif "Holtz & Partner – Startseite im Light- und Dark-Mode") ## Structure: three offers, six target groups, one clear path to an enquiry We developed the concept, design and implementation from scratch. The home page puts the decision front and centre: roof renovation, roof leasing or solar investment. Each offer has its own subpage with requirements, process, benefits and a dedicated enquiry form. Anyone landing directly on a service page from Google finds everything they need there to make a decision. The target groups are deliberately named in concrete terms: commercial and industrial businesses, agricultural operations, property owners, developers of new builds, municipalities and investors. Each group can see at a glance that their building type is covered, from machine halls and logistics centres to sports halls. ![Zielgruppen-Icons der Holtz & Partner Website für Gewerbe, Landwirtschaft, Immobilien, Neubau, Kommunen und Investoren](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-zielgruppen-icons-kundensegmente-solar.avif "Holtz & Partner – Icons für die Kundensegmente der Solarlösungen") The company’s key figures sit prominently above the fold: over 2 million m² of PV surface, on the market since 2012, over 700 projects, over 300,000 kWp. Figures like these do more persuading than any piece of ad copy. ## The lease calculator: instant results instead of a contact-form hurdle The strongest conversion element of the new website is the lease calculator. Prospects set their roof area with a slider and immediately see what one-off payment is realistic. The calculation works with two scenarios, for 80 and 100 % usable area, in order to give an honest picture of typical deductions such as windows, clearances or shading. The calculator lowers the barrier considerably: instead of filling in a form and waiting for a quote, the roof owner gets a sense of the figures in seconds. Anyone who makes an enquiry afterwards is already pre-qualified and knows the order of magnitude. This is exactly how lead journeys should be built for offers that need explaining. ## References with substance: project map and real installation data Over 700 completed projects are an argument – if you can show them. So we developed a dedicated reference system: every installation is recorded with its output in kWp, module count and roof area, and gets its own detail page with photos. The centrepiece is the interactive project map. It shows the company’s regional reach at a glance, with project locations across Germany and a focus in the north-east. A click on a location opens the project data directly on the map. That turns an abstract figure like 700 projects into tangible proof. ![Interaktive Projektkarte der Holtz & Partner Website mit realisierten Solaranlagen in Deutschland und Detailansicht zum Standort Pößneck](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-projektkarte-solaranlagen-deutschland.avif "Holtz & Partner – Projektkarte realisierter Solaranlagen in Deutschland") ![Mobile Ansicht der Holtz & Partner Referenzen und der Dacharten für eine Dachsanierung auf vier Smartphones](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-mobile-ansicht-referenzen-dacharten.avif "Holtz & Partner – Referenzen und Dacharten in der mobilen Ansicht") ## Design: dark mode, light mode and subtle animations As one of the first websites from our studio, holtz-partner.com got a fully fledged dark and light mode. Visitors switch between the two views with a click in the header, and the setting is remembered. The dark design picks up the look of solar modules, the light one conveys clarity and freshness. Both modes are fully designed through, from the logo to the project map. On top of that there are restrained animations such as the bokeh effect in the background, which gives the site depth without distracting from the content. We use motion deliberately and sparingly, as a way to orient the visitor and as a signal of quality. ![Über-uns-Seite der Holtz & Partner Website mit Unternehmensfakten und einem Techniker an einer Photovoltaik-Anlage auf zwei Tablets](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-ueber-uns-seite-responsive-webdesign.avif "Holtz & Partner – Über-uns-Seite im responsiven Webdesign") ![Responsive Startseite der Holtz & Partner Solar-Website auf vier Smartphones mit Call-to-Action-Buttons](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-responsive-startseite-smartphone-solar.avif "Holtz & Partner – responsive Startseite für Smartphones") ## Technology: WordPress with a custom theme, built AI-ready The website runs on WordPress with a custom theme developed specifically for it. The team maintains references, project data and the map themselves via a simple interface, and new installations appear automatically in the overview and on the map. The entire presence is also built AI-ready: structured data following Schema.org describes the company, services and FAQ content in machine-readable form, and the content is worded so that AI systems can quote it correctly. When a roof owner asks ChatGPT or Gemini about leasing a roof for photovoltaics, Holtz & Partner should appear as a source. Our [GEO framework for AI visibility](https://4eck-media.de/en/blog/the-4eck-geo-framework-for-ai-visibility-ai-recommendations/) shows how we go about this. ![SEO-Analyse der Holtz & Partner Website mit 93 Prozent On-Page-Score und Bestwerten bei Meta-Angaben und Seitenstruktur](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-seo-analyse-onpage-score-optimierung.avif "Holtz & Partner – SEO-Analyse und On-Page-Optimierung") ## Measurable quality: the results at a glance The figures after the relaunch: - Google PageSpeed Insights (mobile): 93 points for performance, 100 points for accessibility, 100 points for best practices, 100 points for SEO - Seobility onpage score: 93 %, with 100 % for meta information, page structure and server - Server response time: 0.22 seconds - Accessible implementation in line with WCAG guidelines - Structured data following Schema.org for the company, services and FAQ For a website with an interactive map, a calculator, a video background and two complete colour modes, these values are anything but a given. They show that sophisticated design and [top performance](https://4eck-media.de/en/competencies/pagespeed-optimization-making-websites-measurably-faster/) work together – provided the theme is built for it. ![Google PageSpeed Insights der Holtz & Partner Website mit 93 Punkten Leistung sowie 100 Punkten bei Barrierefreiheit, Best Practices und SEO](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-pagespeed-insights-performance-ladezeit.avif "Holtz & Partner – PageSpeed Insights mit Top-Performance") ## Best practices from this project What other solar and energy companies can take away from this relaunch: - A calculator with an instant result brings in more qualified enquiries than even the best contact form on its own. - References only work with data: kWp, module count and roof area turn photos into proof. - A project map translates company size into an image that anyone understands in two seconds. - Three offers need three pages. Put everything on one page and you lose the visitors who are only looking for one of them. - Dark mode is more than cosmetics: it matches how many users are used to viewing screens and can contribute to the brand if it is designed through consistently. - AI readiness will increasingly determine whether a provider gets recommended in AI answers. Structure your content now and you gain a head start. ## Website for solar companies with SEO & GEO What does a modern website for a solar company have to deliver? It has to make a business model that needs explaining quickly understandable, build trust through verifiable project data and channel enquiries in a structured way. That includes fast loading times, an accessible implementation and structured data for search engines and AI systems. With offers such as roof leasing or solar investment, credibility hinges on the combination of a clear structure and verifiable figures. Why is an online calculator on the website worth it? A calculator with an instant result answers the prospect’s most important question before they get in touch: what’s in it for me? That lowers the barrier, increases the number of enquiries and improves their quality, because prospects come to you with realistic expectations already. What does a project map with reference data achieve? It makes experience visible. A figure like 700 projects stays abstract; a map full of locations with real installation data convinces at a glance. References tied to places also strengthen regional visibility in search engines. And target customers from further afield know that the company works in their region too. Does a dark mode make sense for corporate websites? It can be a strong brand element if it is implemented consistently. Many visitors keep their devices permanently in dark mode and find bright websites tiring in the evening. What matters is that both modes are fully designed through and that contrast meets accessibility requirements in both variants. What does AI-ready mean for a website? The content and the technology are prepared so that AI systems such as ChatGPT, Gemini or Perplexity can capture, classify and quote the company correctly. That includes structured data following Schema.org, precisely worded statements, clean heading structures and machine-readable facts about services and locations. This is becoming increasingly important, because many research processes now start in AI chats. Can the team maintain references and content themselves? Yes. New projects are created via a simple interface with a photo, output, module count and roof area, and appear automatically in the reference overview and on the project map. Text and images can also be updated without an agency. For further development, we stay at the team’s side as a partner. ![Webdesign-Referenz von 4eck Media: Holtz & Partner Solar-Website auf zwei Tablets vor einer Photovoltaik-Anlage mit 93 On-Page-Score](https://4eck-media.de/wp-content/uploads/2026/07/holtz-partner-webdesign-referenz-solar-photovoltaik-onpage-score.avif "Holtz & Partner – Webdesign-Referenz für Solar und Photovoltaik") ## Are you planning a new website for your solar or energy company? We develop websites that: - make an offer that needs explaining understandable in seconds - prove experience with real project data - pre-qualify enquiries via calculators and clear lead journeys - become visible in search engines and AI answers Send us a [no-obligation enquiry](https://4eck-media.de/en/contact/) now.