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Solar Disconnects & Transfer Switches

The balance of system is where solar installations pass or fail inspection. Transfer switches, disconnects, breakers and busbars are what let an inspector see a safe, code-compliant path from array to panel, and they are the parts most DIY builds under-specify.

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Spartan Power Small ANL Fuse Kits Black OR Red
$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00

Spartan Power Small ANL Fuse Kits Black OR Red - BLACK 150A KIT W/CABLE

Spartan Power

The Spartan Power Small ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

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$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00
Spartan Power Small ANL Fuse Kits Black OR Red
$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00

Spartan Power Small ANL Fuse Kits Black OR Red - BLACK 100A KIT W/CABLE

Spartan Power

The Spartan Power Small ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

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$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00
Spartan Power Large ANL Fuse Kits Black OR Red
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Spartan Power Large ANL Fuse Kits Black OR Red - RED 500A KIT

Spartan Power

The Spartan Power Large ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

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$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
Spartan Power Small ANL Fuse Kits Black OR Red
$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19

Spartan Power Small ANL Fuse Kits Black OR Red - BLACK 80A KIT

Spartan Power

The Spartan Power Small ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19
Spartan Power Large ANL Fuse Kits Black OR Red
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Spartan Power Large ANL Fuse Kits Black OR Red - BLACK 500A KIT

Spartan Power

The Spartan Power Large ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
Spartan Power Small ANL Fuse Kits Black OR Red
$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19

Spartan Power Small ANL Fuse Kits Black OR Red - BLACK 100A KIT

Spartan Power

The Spartan Power Small ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19
Spartan Power Large ANL Fuse Kits Black OR Red
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00

Spartan Power Large ANL Fuse Kits Black OR Red - RED 500A KIT W/CABLE

Spartan Power

The Spartan Power Large ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00
Spartan Power Small ANL Fuse Kits Black OR Red
$13.12 - $13.12
$13.12
$13.12 - $13.12
$13.12

Spartan Power Small ANL Fuse Kits Black OR Red - BLACK SMALL FUSE HOLDER ONLY

Spartan Power

The Spartan Power Small ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

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$13.12 - $13.12
$13.12
$13.12 - $13.12
$13.12
Spartan Power Large ANL Fuse Kits Black OR Red
$18.77 - $18.77
$18.77
$18.77 - $18.77
$18.77

Spartan Power Large ANL Fuse Kits Black OR Red - BLACK LARGE FUSE HOLDER ONLY

Spartan Power

The Spartan Power Large ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$18.77 - $18.77
$18.77
$18.77 - $18.77
$18.77
Spartan Power Large ANL Fuse Kits Black OR Red
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00

Spartan Power Large ANL Fuse Kits Black OR Red - BLACK 500A KIT W/CABLE

Spartan Power

The Spartan Power Large ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00
Spartan Power Small ANL Fuse Kits Black OR Red
$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19

Spartan Power Small ANL Fuse Kits Black OR Red - BLACK 150A KIT

Spartan Power

The Spartan Power Small ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19
Spartan Power ANL Fuses Only (Without Holders)
$7.99 - $7.99
$7.99
$7.99 - $7.99
$7.99

Spartan Power ANL Fuses Only (Without Holders) - 500A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$7.99 - $7.99
$7.99
$7.99 - $7.99
$7.99
Spartan Power Large ANL Fuse Kits Black OR Red
$18.77 - $18.77
$18.77
$18.77 - $18.77
$18.77

Spartan Power Large ANL Fuse Kits Black OR Red - RED LARGE FUSE HOLDER ONLY

Spartan Power

The Spartan Power Large ANL Fuse Kits Black OR Red is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$18.77 - $18.77
$18.77
$18.77 - $18.77
$18.77
Spartan Power ANL Fuses Only (Without Holders)
$7.99 - $7.99
$7.99
$7.99 - $7.99
$7.99

Spartan Power ANL Fuses Only (Without Holders) - 400A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

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$7.99 - $7.99
$7.99
$7.99 - $7.99
$7.99
Spartan Power Circuit Breakers
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

Spartan Power Circuit Breakers - 100A

Spartan Power

The Spartan Power Circuit Breakers is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an authorized dealer ...

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$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98
Spartan Power ANL Fuses Only (Without Holders)
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99

Spartan Power ANL Fuses Only (Without Holders) - 60A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99
Spartan Power Circuit Breakers
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

Spartan Power Circuit Breakers - 200A

Spartan Power

The Spartan Power Circuit Breakers is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an authorized dealer ...

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$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98
Spartan Power Circuit Breakers
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

Spartan Power Circuit Breakers - 150A

Spartan Power

The Spartan Power Circuit Breakers is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an authorized dealer ...

View full details
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98
Spartan Power Circuit Breakers
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

Spartan Power Circuit Breakers - 300A

Spartan Power

The Spartan Power Circuit Breakers is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an authorized dealer ...

View full details
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98
Spartan Power ANL Fuses Only (Without Holders)
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99

Spartan Power ANL Fuses Only (Without Holders) - 200A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99
Spartan Power ANL Fuses Only (Without Holders)
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99

Spartan Power ANL Fuses Only (Without Holders) - 100A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99
Spartan Power ANL Fuses Only (Without Holders)
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99

Spartan Power ANL Fuses Only (Without Holders) - 150A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99
Spartan Power ANL Fuses Only (Without Holders)
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99

Spartan Power ANL Fuses Only (Without Holders) - 80A ANL Fuse

Spartan Power

The Spartan Power ANL Fuses Only (Without Holders) is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an au...

View full details
$5.99 - $5.99
$5.99
$5.99 - $5.99
$5.99
Spartan Power Circuit Breakers
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

Spartan Power Circuit Breakers - 70A

Spartan Power

The Spartan Power Circuit Breakers is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as an authorized dealer ...

View full details
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

How to Choose

Size on current and voltage, with margin. DC breakers and disconnects must be rated for DC — an AC-rated breaker will not interrupt a DC arc and is a fire risk, not merely a code violation. Transfer switches are chosen by service size, most commonly 200A for a US home, and by whether you need automatic or manual operation: automatic costs more but means the house recovers without anyone being home. Busbars are sized by total current, and it is worth buying more capacity than you need now so the next battery does not force a rebuild.

Key Specifications Explained

  • DC rating: Breakers and disconnects must be DC-rated, not AC-rated
  • Transfer switch: 200A is standard for a US residential service; automatic or manual
  • Busbars: Rated up to 600A; size for future capacity, not today's load
  • Load centers: Pre-wired balance of system saves a day of enclosure fabrication
  • Listing: UL 67, UL 489 and UL 1008 depending on device class

Brands We Carry

EG4 Electronics, Eaton, Growatt, Tigo Energy, OutBack Power, MidNite Solar, Schneider Electric and IMO Solar.

Frequently Asked Questions

Can I use an AC breaker on the DC side?

No. DC arcs do not self-extinguish at a zero crossing the way AC does. Use DC-rated devices on every DC circuit, without exception.

Automatic or manual transfer switch?

Automatic if the house needs to recover with nobody home — refrigeration, sump pumps, medical equipment. Manual is cheaper and fine for a cabin.

What size busbar?

Total the maximum current of everything landing on it, then step up a size. Busbars are cheap; rebuilding a battery enclosure is not.

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