The verdict in three sentences
For a Munich firm renting 150 to 300 generators to construction sites, trade fairs and festivals, a rental management SaaS connected to your telematics is the best fit in most cases: roughly 150 to 600 EUR a month as a 2026 market ballpark, live in 8 to 12 weeks. A custom app, around 35 000 to 110 000 EUR, pays off when you combine rental, fuel service, cable and distribution board kits and event crews in ways no vendor models well. Whatever you choose, check now that the tool can issue structured e-invoices in a format your German business customers can process.
The 2026 ranking for a Munich generator rental firm
We rank solution types on stable criteria: three year cost, time to go live before the trade fair season, data portability, German language support and the company profile each option suits. Figures are 2026 market ballparks in EUR, except the Kolonell row.
| Rank | Option | Cost (2026 market ballpark) | Go live | Support | Best for |
|---|---|---|---|---|---|
| 1 | Rental management SaaS with telematics API | 150 to 600 EUR per month | 8 to 12 weeks | Usually German or English | 80 to 400 units, standard rental |
| 2 | SaaS + custom event and kit module | Subscription + module | 10 to 14 weeks | Mixed | Heavy event business with complex kits |
| 3 | Open source ERP (Odoo type) with rental module | Hosting + 12 000 to 35 000 EUR integration | 12 to 18 weeks | Partner dependent | Firms wanting stock, workshop and accounting in one tool |
| 4 | Fully custom app, specialist agency | 35 000 to 110 000 EUR | 4 to 7 months | Contract based | Multi depot operators with unique workflows |
| 5 | OEM telematics portal + spreadsheet | 5 to 15 EUR per unit per month | 2 to 6 weeks | Manufacturer | Small fleets, no integrated billing |
| 6 | Freelance developer | 12 000 to 35 000 EUR | Variable | Key person risk | Single module or prototype |
Kolonell is a nearshore option on rows 2 and 4. Kolonell's prices: a mid size app from 6 100 to 10 670 EUR (4 000 000 to 7 000 000 FCFA), a complex app from 10 670 to 22 870 EUR and up (7 000 000 to 15 000 000 FCFA and up). Telematics hardware and its subscriptions are separate.
Features that protect your margin
A 200 kVA unit on a construction site leaks money through under reported run hours, fuel that vanishes and missed service intervals. Your software should close those gaps.
| Feature | Leak it closes | Requirement to write into the quote |
|---|---|---|
| Automatic run hour capture | Billing based on customer statements | Telematics sync at least daily |
| Fuel level monitoring | Diesel delivered but missing | Alert on sudden drops while idle |
| Service schedule by hours | Breakdowns on site | Alerts at OEM intervals per unit |
| Kit management (cables, boards, tanks) | Lost accessories after events | Kits checked out and back with photos |
| Structured e-invoicing (XRechnung or ZUGFeRD) | Rejected invoices from large customers | Export validated against the formats |
| GoBD compliant records | Problems at tax audit | Immutable invoice archive and audit log |
| Mobile app for technicians | Paper service sheets | Offline entry, sync on reconnect |
Germany is phasing in mandatory B2B e-invoicing under the Growth Opportunities Act (Wachstumschancengesetz). Check the current timeline and thresholds published by the Federal Ministry of Finance (BMF) with your tax adviser: the software must support the formats, your adviser confirms what applies to you.
Three year total cost
Assumptions: 220 generators, 10 technicians, 8 office users, telematics units at about 300 EUR each (ballpark).
| Option | Setup | Annual recurring | Three year total (estimate) |
|---|---|---|---|
| SaaS at 450 EUR per month + OEM portal | 6 000 EUR | 5 400 + 26 400 EUR telematics | 101 400 EUR |
| Configured open source ERP | 25 000 EUR | 7 000 + 26 400 EUR telematics | 125 200 EUR |
| Custom build, agency, 70 000 EUR + own telematics | 70 000 + 66 000 EUR hardware | 10 500 EUR | 167 500 EUR |
| Custom build, Kolonell complex app + own telematics | 22 870 + 66 000 EUR hardware | 2 196 EUR (Kolonell Premium maintenance) | 95 460 EUR |
The Kolonell row uses Kolonell's prices, with Premium maintenance at 183 EUR (120 000 FCFA) a month. Other rows are market estimates, net of VAT.
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Mini case study
Illustrative example: Stefan is managing director of a Munich mobile power rental firm with 220 generators serving construction firms and the trade fair calendar. Run hours are read manually at return, and he estimates 2.5 % of monthly rental revenue of 210 000 EUR goes unbilled, about 5 250 EUR a month. He chooses a rental SaaS at 450 EUR a month, adds telematics to the 120 largest units (36 000 EUR) and commissions a kit tracking module for events at about 9 000 EUR. With 5 250 EUR recovered each month and roughly 1 200 EUR of lost accessories avoided, the investment of about 51 000 EUR pays back in under 9 months.
FAQ
Do we need telematics on every unit?
Not at first. Start with the 100 to 150 largest units where one unbilled day costs the most, then extend.
Can a SaaS issue XRechnung or ZUGFeRD invoices?
Many German market tools can, international ones less often. Ask for 2 or 3 sample files and validate them before signing.
What does Kolonell charge for a fleet app?
Kolonell's prices run from 6 100 to 10 670 EUR for a mid size app and from 10 670 to 22 870 EUR and up for a complex app with telematics integration.
How long to go live?
Allow 8 to 12 weeks for SaaS and 4 to 7 months for custom, with a 20 to 30 unit pilot before the trade fair season.
Who owns the telematics data?
Check both the hardware and software contracts. Require a full export of run hours and fuel history at least quarterly.
Let's scope your project. Tell us your fleet size, telematics hardware and billing setup, and we will price a module or a full fleet app with an indicative budget and pilot timeline. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
