Off-grid energy calculator

With our energy calculator, you can easily calculate your energy requirements for your application. We recommend the right fuel cell for the off-grid operation of your application.

Get your daily energy demand

Battery voltage
Power demand W
consumption A
Operation per day h
0 Wh / day
Total requirement 0 Wh / day

Solar panels available?

Do you already use solar panels?


Total nominal power Wp

System losses %


Energy yield in worst month:

Annual energy yield:

Size of solar panels:

0 Wh / day

0 kWh

ca. 0

Recommendation of the Energy Calculator

The Modelname is the ideal power supply for your application.


Max. load (device) W
Energy demand per day Wh / day
Average output W
Battery voltage V
Operating hours per year and per device hours
Methanol consumption per year liter
Recommended EFOY Pro fuel cell

The daily energy demand you have specified cannot be covered by the EFOY alone. Hybrid operation with another energy source such as solar is required. If you have any questions, please feel free to contact us. Contact

Please note that the power requirements of your equipment may increase at high or low outdoor temperatures, due to additional components requiring active ventilation or heating.

Required components

Additional components are required to operate the EFOY/EFOY Pro fuel cells. For detailed information, please contact us, we will be happy to advise you.

  • EFOY fuel cartridges (M10, M28 or MT60)
  • M28-Adapter (only for M28 fuel cartridges)
  • Batteries


Optional components

We offer additional optional components for operating the EFOY/EFOY Pro fuel cells. For detailed information, please contact us. We will be happy to advise you.

  • Modem/Router
  • EFOY Cloud (remote monitoring)
  • EFOY Fuel Manager
  • Solar charge controller
  • Inverter
  • Rectifier
  • Mains charger

…and more


Energy demand per year

Adjust the output of the solar system

max WP

Annual summary

(in kWh)
(in kWh)
(in kWh)
Methanol consumption
(in litre)


EFOY fuel cartridge1 per device2 per device4 per device
Fuel Cartridge M10 days days days
Fuel Cartridge M28 days days days
Fuel Tank MT60 days days days

The shown values are average values for one year. The real autonomous runtime depends on season and may vary because of antifreeze mode as well as start/shut-down phases of EFOY Pro where not the full power output is generated.

Operating hours per year and per device

Device nameAmountOperating Hours
EFOY 80 hours
EFOY 150 hours
EFOY Pro 900 hours
EFOY Pro 1800 hours
EFOY Pro 2800 hours
EFOY Pro 12000 (Duo) hours

Average values; actual yearly number of operating hours can vary depending on age of EFOY Pro unit

Input Values

Input Values

Energy demand per day Wh / day
Nominal power of solar panel Wp
System losses %
Annual energy yield kWh
Size of solar panelsca.


Link for this calculation:

Under the following link you can see this calculation later and also change your input.

Would you like to save this calculation as a PDF?

Please assign a project name:


Do you have questions concerning the result?

Our experts will gladly help you to interpret your results.

Contact us!


SFC Energy AG takes no responsibility for correctness of this calculation. The values generated by the energy calculator are estimates under ideal conditions only and should not be taken as formal quotes. The real energy yield from solar panel can depend on further factors like inclination, alignment and fouling of solar panels as well as shading due to buildings, trees, etc..

Daily requirement too high, no recommendation possible

Your information on the daily requirement is too high. Currently no recommendation is possible. Please contact us if you have any further questions or if you would like individual advice on your project.

Edit entries Contact To the back-up energy calculator

You do not need a power supply

Please check your entry. With the given values ​​you have enough power available. A recommendation is not possible.