www.metel.eu 2/10
www.iplog.eu
REV-202106
Outdoor Cabinets for OFF-GRID Systems
OH6425
OG1
OH6425
OG1
IP66
EN 61439-1
IEC 61131-3
LTE
Example of Dimensioning a 12V OFF-GRID System with a Fixed PoE Camera
Step 1: Calculate the Energy of the System
First, find out the maximum power consumption of the connected devices and calculate the daily
consumption of the system from it.
Example: Camera MOBOTIX M26 - power consumption until 5 W,
PLC IPLOG with LTE IPLOG-G3-21 - power consumption until 4 W,
PoE+ Injector POE-PSE-30 - power consumption until 1W.
Max. power consumption of connected devices = 10W a Daily system consumption = 10 x 24 = 240 Wh
&
There are situations where it is not necessary to have all devices functional in 24/7 mode, but it is
enough to turn them on only when needed. In such situations, we recommend using the PLC control
program, which switches individual devices on / off as required.
Step 2: Calculate the Size of the Panels and the Backup Battery
An online form is available at https://re.jrc.ec.europa.eu/pvg_tools/en/, where you can find out after
selecting the installation site, setting the daily system consumption, battery capacity, panel performance
and clicking on
Visualize results
whether the selected combination is suitable. By gradually adjusting the
selected values, you will get to the optimal values that will suit the given system.
Step 3: Select Suitable Types of Panels and Backup Battery
We recommend using BlueSolar polycrystalline panels or other panels with similar
parameters as the energy source. The panels are suitable for systems with a working
voltage of 12V. If more power is needed, it is possible to connect the panels in parallel
and in series, provided that the maximum no-load voltage does not exceed 75V.
The system must be backed up with a high-quality battery suitable for cyclic
operation, such as 60Ah Victron batteries type BAT412550084. The critical period for
the battery is the winter period, when the charging time is reduced to a maximum of 6
hours between 10 am and 4 pm (Central Europe). In addition, due to low
temperatures, the capacity drops by up to 50% at
−20
°C. Components of the
switchboards include shelves for placing the accumulator and an overpressure fuse
enabling pressure equalization if the accumulator produces hydrogen during charging.
Step 4: Provide Surge Protection
A direct lightning strike on unprotected devices can destroy them. A suitable solution
is to ground the mast and to comply with other recommendations given in the
standard ČSN EN 62305. In general, it is important that all electronic devices are
hidden in the protective angle of the collector.
Example of Dimensioning a 12V OFF-GRID System with a Fixed PoE Camera
Step 1: Calculate the Energy of the System
First, find out the maximum power consumption of the connected devices and calculate the daily
consumption of the system from it.
Example: Camera MOBOTIX M26 - power consumption until 5 W,
PLC IPLOG with LTE IPLOG-G3-21 - power consumption until 4 W,
PoE+ Injector POE-PSE-30 - power consumption until 1W.
Max. power consumption of connected devices = 10W a Daily system consumption = 10 x 24 = 240 Wh
&
There are situations where it is not necessary to have all devices functional in 24/7 mode, but it is
enough to turn them on only when needed. In such situations, we recommend using the PLC control
program, which switches individual devices on / off as required.
Step 2: Calculate the Size of the Panels and the Backup Battery
An online form is available at https://re.jrc.ec.europa.eu/pvg_tools/en/, where you can find out after
selecting the installation site, setting the daily system consumption, battery capacity, panel performance
and clicking on
Visualize results
whether the selected combination is suitable. By gradually adjusting the
selected values, you will get to the optimal values that will suit the given system.
Step 3: Select Suitable Types of Panels and Backup Battery
We recommend using BlueSolar polycrystalline panels or other panels with similar
parameters as the energy source. The panels are suitable for systems with a working
voltage of 12V. If more power is needed, it is possible to connect the panels in parallel
and in series, provided that the maximum no-load voltage does not exceed 75V.
The system must be backed up with a high-quality battery suitable for cyclic
operation, such as 60Ah Victron batteries type BAT412550084. The critical period for
the battery is the winter period, when the charging time is reduced to a maximum of 6
hours between 10 am and 4 pm (Central Europe). In addition, due to low
temperatures, the capacity drops by up to 50% at
−20
°C. Components of the
switchboards include shelves for placing the accumulator and an overpressure fuse
enabling pressure equalization if the accumulator produces hydrogen during charging.
Step 4: Provide Surge Protection
A direct lightning strike on unprotected devices can destroy them. A suitable solution
is to ground the mast and to comply with other recommendations given in the
standard ČSN EN 62305. In general, it is important that all electronic devices are
hidden in the protective angle of the collector.
Compared to systems powered from a 230V network, solar OFF-GRID systems have a
significant disadvantage in an unstable energy supply, which is largely dependent on
the weather at the installation site. When designing, it is necessary to take into
account the changing amount of incident solar energy during the year. The EU
website (https://ec.europa.eu/jrc/en/pvgis) focusing on photovoltaic systems is
therefore a great simplification of this proposal. It contain detailed maps of sunshine
for the whole of Europe and the surrounding areas, including online forms for
calculating the size of photovoltaic panels and batteries.
