Roof area & orientation
We assess the usable area, orientation and pitch of your roof and estimate what system size is realistic.
Photovoltaics · Potential analysis
How much sun is in your roof?
With just a few details about your building and your electricity consumption, we can assess the potential of your roof area – fast, free and with no obligation.
Online calculator
Calculate your energy home
Configure photovoltaics, storage and a wallbox for your building and receive an initial assessment instantly – free and with no obligation.
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If the calculator does not appear (e.g. because of an ad-blocker), simply use the enquiry form below – we'll get back to you with your personal assessment.
The online calculator is a service provided by our partner Reonic. When it loads, data is transmitted to Reonic; you can find details in our Privacy policy.
Your initial assessment
What our potential analysis includes
A few key figures turn into a clear picture: we review your details and get back to you with a well-founded initial assessment.
Cost-effectiveness
Based on your electricity consumption, we show how much self-consumption is possible and what range of savings you can expect.
Concrete recommendation
You receive an easy-to-understand appraisal: is a system worthwhile, what options are there – and what would the next step look like?
Potential enquiry
Get started right away with our online calculator:
Fill in the form – your email program will open with a prepared message to us. We review your details and get back to you with your personal initial assessment.
E-Mailinfo@e-efa.de
Phone+49 5434 9460 301
- Reply usually within a few working days
- No obligation – you decide on every further step
- A personal consultation right away on request
On request, we can produce a personal initial assessment of your roof remotely – based on satellite and aerial imagery. This initial assessment is free and non-binding for you.
Your data is used solely to process your enquiry. You can find details in our Privacy policy.
And then?
What happens after your enquiry
Send your enquiry
You send us your key figures – by form, email or phone.
Initial assessment
We evaluate your roof potential and consumption data and get back to you with an initial appraisal.
Consultation
Together we discuss options, cost-effectiveness and possible funding for your project.
Your offer
On request, you receive a concrete offer tailored to you – with no obligation.
Prefer to talk directly?
Call us or drop us a line – we're happy to advise you personally on your photovoltaic project.