Solar Industry Insight, Which DC Fuse Is Right for Your Solar Project?

As PV systems continue to evolve toward higher power modules, higher string currents, and 1500V DC architectures, selecting the correct DC fuse has become more important than ever.

Although 10×38mm, 10×85mm, 14×85mm, and 22×58mm DC fuses may look similar, each is designed for different current ratings, voltage levels, and applications.

Here's a quick guide to help you choose the right solution.

1. 10×38mm DC Fuse – The Global Standard for PV String Protection

The 10×38mm fuse remains the most widely used photovoltaic fuse worldwide.

Typical Ratings:

• Voltage: 1000VDC / 1500VDC

• Current: 1A–32A

Typical Applications:

• PV String Protection

• Combiner Boxes

• String Boxes

• DC Distribution Boxes

This fuse is commonly installed inside fuse holders to protect each PV string from overcurrent and reverse current.

It is the preferred choice for residential, commercial, and utility-scale solar projects.

2. 10×85mm DC Fuse – Designed for Higher Current 1500V Systems

As module power continues to increase beyond 700W and string currents exceed 20A, many large-scale solar projects are moving toward 10×85mm fuses.

Typical Ratings:

• Voltage: 1500VDC

• Current: 1A–32A

Typical Applications:

• Large PV Combiner Boxes

• Central Inverters

• Utility-Scale Solar Farms

Compared with the traditional 10×38mm design, the larger fuse body provides better heat dissipation and higher current capability.

3. 14×85mm DC Fuse – For High-Power Inverter Protection

The 14×85mm fuse is commonly selected for even higher current applications.

Typical Ratings:

• Voltage: 1500VDC

• Current: 20A–50A

Typical Applications:

• Central Inverters

• DC Distribution Cabinets

• PV Array Protection

With the rapid growth of high-power PV modules, this fuse size is becoming increasingly popular in utility-scale installations.

4. 22×58mm DC Fuse – The Preferred Choice for Energy Storage Systems

Unlike the previous fuse sizes, 22×58mm fuses are mainly used in high-current DC circuits rather than individual PV strings.

Typical Ratings:

• Voltage: Up to 1500VDC

• Current: 50A–100A 

Typical Applications:

• Battery Energy Storage Systems (BESS)

• PCS (Power Conversion Systems)

• Battery Cabinets

• DC Distribution Cabinets

As the global energy storage market continues to expand, demand for this fuse size is growing rapidly.

Fuse Holder or Fuse Connector – Which Is More Popular?

Both products play important roles, but they serve different markets.

DC Fuse Holders

Used inside:

• PV Combiner Boxes

• DC Cabinets

• Inverter Protection Systems

They account for the majority of installations in utility-scale solar projects because they are easy to maintain and replace.

Estimated market share: 80–90%

PV MC Fuse Connectors DC15100V IP68

Installed directly in the PV string without requiring a combiner box.

Advantages:

• Faster installation

• Lower labor costs

• Simplified wiring

• Ideal for rooftop solar systems

PV MC fuse connectors are becoming increasingly popular in residential and commercial rooftop installations, especially in Europe and Australia.

Regional Market Preferences

Europe

• Growing demand for 1500V systems

• Increasing adoption of 10×85mm fuses

• Strong interest in Solar MC fuse connectors

North America

• 10×38mm remains the dominant solution

• UL-certified fuse holders are widely specified

Australia

• Strong rooftop solar market

• High acceptance of Solar MC fuse connectors

Brazil

• Fuse holders dominate utility-scale projects

• Growing demand for rooftop fuse connector solutions

Middle East

• Utility-scale solar farms mainly use fuse holders

• Increasing demand for higher-current 1500V solutions

Energy Storage Market

• 22×58mm fuse holders are becoming the standard choice for battery protection worldwide.

NSPV Complete DC Protection Solutions

At NSPV, we provide a complete range of DC protection solutions for modern photovoltaic and energy storage systems, including:

✔ 10×38mm DC Fuse Holders & DC Fuse Connectors (1000V / 1500V)

✔ 10×85mm DC Fuse Holders & DC Fuse Connectors (1000V / 1500V)

✔ 14×85mm DC Fuse Holders & DC Fuse Connectors (1000V / 1500V)

✔ 22×58mm DC Fuse Holders & DC Fuse Connectors (1000V / 1500V)

All NSPV DC fuse solutions are available in both 1000VDC and 1500VDC versions, with a complete portfolio of Fuse Holders and Fuse Connectors designed to meet the protection requirements of residential, commercial, utility-scale PV plants, and battery energy storage systems (BESS).

As solar and energy storage technologies continue to advance, choosing the right DC fuse solution is essential for maximizing system safety, reliability, and long-term performance.