PNI CBM-2 Single Fase DC Combiner Box User Manual
- June 13, 2024
- PNI
Table of Contents
PNI CBM-2
Single fase DC combiner box
Safety instructions
Please read this manual carefully before installation. Take all the measures described below for personal and equipment safety.
| Warning!
AII the wirings should be performed by a professional electrician.
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| Warning!
Operation and wirings must comply with national and local norms and
standards.
| Warning!
During the day installation of the photovoltaic modules, use an opaque
material to cover the photovoltaic moduIes, as they will produce a high
voltage that may cause electric shock.
Brief introduction
ln order to reduce the wire connection between PV components and inverter, to improve the reliability and to be convenient to maintain, the combiner box is needed generally for large Grid-Connected PV systems.
PNI CBM-2 is specially designed to satisfy this requirement. lt sets up a complete solution for a PV power generation system with an inverter. By using a combiner box, the user could combine a certain number of PV components with the same specification into one PV components bunch according to the input DC voltage range of the inverter, then which will be more convenient for the connection of the latter inverter.
It is strongly recommended that the user should follow all the necessary safety measures listed in the instructions manual to ensure personal safety and reduce danger.
PNI CBM-2 DC Combiner Box have the below features:
- Protection grade IP65, outdoor installation and operation
- It prevents the components damage from UV, acids, alkali, moisture, mildew and rats.
- Every string is equipped with DC 1000V 15A Fuse, up to 2 strings could be accessed at the same time.
- Equipped with DC SPD, either positive pole or negative pole. Lightning protection.
- 4-Pole DC isolator Switch. The poles are connected in series respectively by polarity to improve DC withstand voltage.
Basic structure
Internal arrangement of DC combiner box
- DC fuse
- DC SPD
- DC isolator switch
- Earthing terminal
Installation and operation
Basic requirements for installation
Although the protection grade of this product is IP65, it can be installed
outdoors, but, being an electronic device, it should not be placed in damp
places.
The dimensions of the DC combiner box are 292 x 220 x 120 mm, the vertical wall installation is suggested.
The input circuit configuration
DC combiner box allows up to 2 ways of PV components to access.
Terminal size and cable size
The user can select the appropriate wire to the different terminal according
to the below table:
| Item | Gland | Recommended wiring |
|---|---|---|
| Input wire | PG09 | 4-8mm |
| Output wire | PG21 | 13-18mm |
| Grounding wire | PG13.5 | 6.7-12mm |
Self-lock for opening and closing
Recommended wiring 4-8mm 13-18mm 6.7-12mm
Fuse grade
In any power system, fuses are used to protect the electronic device from overcurrent damage, otherwise, this current may cause the electronic device to be out of work, overheat, or even fire risk.
If the fuse grade is too large, the fuse can not provide protection or f it is too small the device will not work normally. Therefore, selecting the right fuse is needed based on the rating of PV modules and the requirements of relevant standards.
The minimum grade of a fuse can be calculated by the short-circuiting of photovoltaic components. If there are no special requirements of local standards, we suggest the ratings of the fuse and wiring used in the system need to meet no less than 1.56 times the Isc value.
According to the above description, the rating of the fuse in the DC Combiner Box is 1000V 15A, so we can get the maximum short-circuit of each PV string is 15/1.56=9.62A.
Because the fuse is optional according to user needs, so the above situation is just an example. lf want to match fuse in other grade, users need to check the instruction above to make sure whether the fuse meets the requirement.
Technical data
| Number of DC inputs | 2 |
|---|---|
| Number of DC outputs | 1 |
| Max. rated voltage | 1000V DC |
| DC isolator switch | 32A 1000V |
| DC surge protection | In=20kA, Imax=40kA, 1000V DC |
| DC fuse holder | Imax=30A,1000V DC |
| DC fuse link | 15A |
| Monitoring | / |
| Power supply | / |
| Cable for inputs | PG09 |
| Cable for outputs | PG21 |
| Glands for earth | PG13.5 |
| Protection degree | IP65 |
| UV resistance | Yes |
| Dimensions | 292 x 220 x 120 mm |
| **Warning! |
As the fuse withstands high voltage from the inverter and the PV array, it
is strictly prohibited to check it while the system is working. The DC
isolator switch must be on the Off position before replacing the fuse. Please
note that all terminals of the DC lsolator Switch remain under highvoltage.
The fuse must be replaced with a similar one (same grade). **
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The DC lsolator Switch grade
The grade of DC lsolator Switch we provide for PNI CBM-2 is 1000V, by using 4P DC lsolator Switch are respectively connected by polarity to improve DC withstand voltage value which is not less than 1000V.
Simplified EU declaration of conformity
SC ONLINESHOP SRL declares that PNI CBM-2 single fase DC combiner box is
in accordance with the LVD Directive 2014/35/EU. The full text of the EU
declaration of conformity is available at the following internet address:
https://www.mypni.eu/products/8530/download/certifications
References
Read User Manual Online (PDF format)
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