DC side protection

Solar DCDB box

A solar DCDB box combines the DC strings coming from the panels and protects them before the current reaches the inverter. JS Electrical builds DCDB boxes for string counts from one in one out upward.

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Solar DCDB 1 in 1 out box, open, showing the DC MCB, surge protection device and DC terminals inside

What a solar DCDB box does

Panels are wired into strings, and each string carries a fuse or DC MCB that protects the wiring if a fault develops. The DCDB brings these strings together, holds the surge protection device that absorbs a lightning strike or induced surge on the array wiring, and hands off a single protected DC feed to the inverter.

Solar ACDB single phase and solar DCDB 1 in 1 out boxes with transparent covers and JS Electrical branding
Solar ACDB single phase and DCDB 1 in 1 out, ready to mount

What we manufacture

  • String counts from 1 in 1 out to multi-string configurations
  • DC rated MCBs or fuses sized to the string current
  • Type 2 DC surge protection device
  • IP65 enclosure rated for rooftop and outdoor mounting
  • Positive and negative terminals clearly marked and separated

Specifications

String inputsBuilt to the number of strings in your array
EnclosureIP65 polycarbonate or powder-coated metal, transparent lid
ProtectionDC MCB or fuse per string, Type 2 DC surge protection device
MountingWall or structure mount, indoor or outdoor
VoltageSized to your panel string voltage on request
Tell us your string count, panel voltage and inverter DC input rating, and we will confirm the exact DCDB configuration before manufacturing.

Where it is used

Rooftop residential and commercial installations, ground-mount plants, and any array with more than one string that needs to be combined and protected before the inverter, from a 3kW single-string home system to a larger multi-string commercial array. Usually paired with a matching ACDB box on the output side and an earthing kit for the array structure.

Frequently asked questions

How many strings can a DCDB handle?

We build DCDBs from a single 1 in 1 out configuration up to multi-string boxes. Tell us your string count and we will confirm the layout.

How much does a solar DCDB box cost?

Price depends on the string count, voltage and enclosure size. Tell us your system size, for example a DCDB box for a 3kW or 5kW solar system, and we will quote a price for the quantity you need.

Does the DCDB include surge protection?

Yes, our standard DCDB boxes include a Type 2 DC surge protection device. Higher protection classes are available on request.

Can the DCDB and ACDB be supplied as a matched pair?

Yes, most orders are for a matched ACDB and DCDB pair sized to the same inverter and array. Send both requirements together for one quote.