Stand-alone system design

Stand-alone systems are systems that are not connected to the mains. Choosing not to connect to the mains can have diverse reasons.

Mountain chalets are isolated and mostly do not have sufficient financial or energetic means to install, maintain or run a mains supply.

Mobile applications must do without a mains connection due to the nature of being mobile.

Overhead cables, as found on railway lines, are elaborate and cost intensive to install and run.

A 100% energy supply from such systems is generally secured through oversizing of the energy generator and storage. Large solar surfaces in combination with equally large energy storage devices cause, even in their production, a considerable CO2 footprint and costs. Such oversizing is particularly disadvantageous with stand-alone systems because surplus energy cannot be fed into the grid. A financial amortisation is just as unreachable as a positive CO2 balance. 

In regard to the carbon footprint, it is necessary to keep costs low even during the production. An all-round security of energy supply (100% energy self-sufficiency) requires careful consideration during the design phase. This can happen through diversification of energy production (solar, wind, water). Intermittent absence of the necessary elements (light, wind, water) means dependency on the energy storage to guarantee supply. In order to reduce the cost and CO2 of the storage/Battery to an acceptable level, makeshift solutions are almost inevitable.

A connectable energy generator, although itself emitting CO2, that activates and deactivates when necessary helps to keep the carbon footprint small. MEBREX offers such devices in mobile models. These can be controlled automatically and provide 100% self-sufficiency. Furthermore, they reliably protect the optimally reduced battery from damage caused by over-discharging. 

Electricity supply fur mountain chalets and decentralised buildings (stand-alone systems)

The connection to a mains supply is not affordable?

Mebrex suggests a solution that combines the advantages of existing systems (Fig. 1) whilst avoiding most of their disadvantages.

The system consists of solar panels in combination with a smaller battery and a small but very special patented Mebrex generator.

Mebrex enhances the system with its small patented generator which is only activated to avoid the battery becoming flat. Therefore, a costly black start generator is also avoided. This is all executed fully automatically (auto start-stop)!

Alongside the savings in total installation costs, due to the smaller battery and a lower number of solar panels, further reduced costs can be realised as well as a smaller carbon footprint. Additional CO2 is only produced at low levels during extended power failures.


 Best solution for a green image through the use of renewable energy (what is possible, not only what is necessary)

 A clear and palpable solution

 Minimal installation costs via smaller components 

 Scalable for diverse application sizes

 CO2 free during short power failures

 During long power failures the generator runs to the minimum required (auto start-stop)

 Use of low CO2 fuels (E-Fuels) in development


Fig. 1