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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 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 400A 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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$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00
Victron Energy MEGA Fuses - Fuse Holder
$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75

Victron Energy MEGA Fuses - Fuse Holder - MEGA-fuse 80A/80V (package of 5 pcs)

Victron Energy

The Victron Energy MEGA Fuses - Fuse Holder is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an authoriz...

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$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75
Victron Energy MEGA Fuses - Fuse Holder
$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75

Victron Energy MEGA Fuses - Fuse Holder - MEGA-fuse 40A/80V (package of 5 pcs)

Victron Energy

The Victron Energy MEGA Fuses - Fuse Holder is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an authoriz...

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$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75
Victron Energy MEGA Fuses - Fuse Holder
$15.30 - $15.30
$15.30
$15.30 - $15.30
$15.30

Victron Energy MEGA Fuses - Fuse Holder - Single MEGA Fuse Holder CIP000100001

Victron Energy

The Victron Energy MEGA Fuses - Fuse Holder is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an authoriz...

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$15.30 - $15.30
$15.30
$15.30 - $15.30
$15.30
Victron Energy VE.Direct Bluetooth Smart Dongle
$39.95 - $39.95
$39.95
$39.95 - $39.95
$39.95

Victron Energy VE.Direct Bluetooth Smart Dongle

Victron Energy

The Victron Energy VE.Direct Bluetooth Smart Dongle is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an ...

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$39.95 - $39.95
$39.95
$39.95 - $39.95
$39.95
IMO DC Disconnect Rooftop Isolator Switch - 4 Pole - 2 String - IMO DC Disconnect Rooftop Isolator Switch displaying the side view highlighting the IP67-rated enclosure
IMO DC Disconnect Rooftop Isolator Switch - 4 Pole - 2 String - IMO DC Disconnect Rooftop Isolator Switch showing the front view with the rotary actuator switch and plastic enclosure
$89.68 - $89.68
$89.68
$89.68 - $89.68
$89.68

IMO DC Disconnect Rooftop Isolator Switch - 4 Pole - 2 String

IMO Solar

The IMO DC Disconnect Rooftop Isolator Switch - 4 Pole - 2 String is an electrical component from IMO Solar — Configuration 4; Pole String Capacity...

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$89.68 - $89.68
$89.68
$89.68 - $89.68
$89.68
Spartan Power ABS Double Solar Cable Entry Gland WHITE (4 Pack)
Spartan Power ABS Double Solar Cable Entry Gland WHITE (4 Pack)
$31.99 - $31.99
$31.99
$31.99 - $31.99
$31.99

Spartan Power ABS Double Solar Cable Entry Gland WHITE (4 Pack)

Spartan Power

The Spartan Power ABS Double Solar Cable Entry Gland WHITE (4 Pack) is supplied new by Urban Supply Inc.Specifications SKU SP-ABS-2EG-W-4PACK Order...

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$31.99 - $31.99
$31.99
$31.99 - $31.99
$31.99
Spartan Power ABS Double Solar Cable Entry Gland WHITE (2 Pack)
Spartan Power ABS Double Solar Cable Entry Gland WHITE (2 Pack)
$15.99 - $15.99
$15.99
$15.99 - $15.99
$15.99

Spartan Power ABS Double Solar Cable Entry Gland WHITE (2 Pack)

Spartan Power

The Spartan Power ABS Double Solar Cable Entry Gland WHITE (2 Pack) is supplied new by Urban Supply Inc.Specifications SKU SP-ABS-2EG-W-2PACK Order...

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$15.99 - $15.99
$15.99
$15.99 - $15.99
$15.99
Spartan Power ABS Double Solar Cable Entry Gland WHITE (3 Pack)
Spartan Power ABS Double Solar Cable Entry Gland WHITE (3 Pack)
$23.99 - $23.99
$23.99
$23.99 - $23.99
$23.99

Spartan Power ABS Double Solar Cable Entry Gland WHITE (3 Pack)

Spartan Power

The Spartan Power ABS Double Solar Cable Entry Gland WHITE (3 Pack) is supplied new by Urban Supply Inc.Specifications SKU SP-ABS-2EG-W-3PACK Order...

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$23.99 - $23.99
$23.99
$23.99 - $23.99
$23.99
Spartan Power ABS Double Solar Cable Entry Gland BLACK (4 Pack)
Spartan Power ABS Double Solar Cable Entry Gland BLACK (4 Pack)
$31.99 - $31.99
$31.99
$31.99 - $31.99
$31.99

Spartan Power ABS Double Solar Cable Entry Gland BLACK (4 Pack)

Spartan Power

The Spartan Power ABS Double Solar Cable Entry Gland BLACK (4 Pack) is supplied new by Urban Supply Inc.Specifications SKU SP-ABS-2EG-B-4PACK Order...

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$31.99 - $31.99
$31.99
$31.99 - $31.99
$31.99
Spartan Power ABS Double Solar Cable Entry Gland BLACK (3 Pack)
Spartan Power ABS Double Solar Cable Entry Gland BLACK (3 Pack)
$23.99 - $23.99
$23.99
$23.99 - $23.99
$23.99

Spartan Power ABS Double Solar Cable Entry Gland BLACK (3 Pack)

Spartan Power

The Spartan Power ABS Double Solar Cable Entry Gland BLACK (3 Pack) is supplied new by Urban Supply Inc.Specifications SKU SP-ABS-2EG-B-3PACK Order...

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$23.99 - $23.99
$23.99
$23.99 - $23.99
$23.99
Spartan Power ABS Double Solar Cable Entry Gland BLACK (2 Pack)
Spartan Power ABS Double Solar Cable Entry Gland BLACK (2 Pack)
$15.99 - $15.99
$15.99
$15.99 - $15.99
$15.99

Spartan Power ABS Double Solar Cable Entry Gland BLACK (2 Pack)

Spartan Power

The Spartan Power ABS Double Solar Cable Entry Gland BLACK (2 Pack) is supplied new by Urban Supply Inc.Specifications SKU SP-ABS-2EG-B-2PACK Order...

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$15.99 - $15.99
$15.99
$15.99 - $15.99
$15.99
Spartan Power 600 Volt Quick Connect Disconnect Kits
$10.99 - $10.99
$10.99
$10.99 - $10.99
$10.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 50A 6 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

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$10.99 - $10.99
$10.99
$10.99 - $10.99
$10.99
Spartan Power 600 Volt Quick Connect Disconnect Kits
$19.99 - $19.99
$19.99
$19.99 - $19.99
$19.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 120A 2 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

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$19.99 - $19.99
$19.99
$19.99 - $19.99
$19.99
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 - RED 50A 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 600 Volt Quick Connect Disconnect Kits
$10.99 - $10.99
$10.99
$10.99 - $10.99
$10.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 50A 8 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

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$10.99 - $10.99
$10.99
$10.99 - $10.99
$10.99
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 - RED 60A 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 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 50A 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 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 - RED 35A 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 600 Volt Quick Connect Disconnect Kits
$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 175A 2 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

View full details
$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99
Spartan Power 600 Volt Quick Connect Disconnect Kits
$10.99 - $10.99
$10.99
$10.99 - $10.99
$10.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 50A 10/12 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

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$10.99 - $10.99
$10.99
$10.99 - $10.99
$10.99
Spartan Power 600 Volt Quick Connect Disconnect Kits
$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 175A 1/0 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

View full details
$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99
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 35A 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 600 Volt Quick Connect Disconnect Kits
$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99

Spartan Power 600 Volt Quick Connect Disconnect Kits - 175A 4 AWG

Spartan Power

The Spartan Power 600 Volt Quick Connect Disconnect Kits is a electrical component from Spartan Power, supplied new and sold by Urban Supply Inc as...

View full details
$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99

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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