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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 Circuit Breakers
$19.98 - $19.98
$19.98
$19.98 - $19.98
$19.98

Spartan Power Circuit Breakers - 250A

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 - 50A

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 - 30A

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
Enphase IQ System Controller 3 Microgrid Interconnect Device
$2,429.23 - $2,429.23
$2,429.23
$2,429.23 - $2,429.23
$2,429.23

Enphase IQ System Controller 3 Microgrid Interconnect Device

Enphase Energy

The Enphase IQ System Controller 3 Microgrid Interconnect Device is a electrical component from Enphase Energy, supplied new and sold by Urban Supp...

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$2,429.23 - $2,429.23
$2,429.23
$2,429.23 - $2,429.23
$2,429.23
REDARC Tow-Pro Link Electric Brake Controller
$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00

REDARC Tow-Pro Link Electric Brake Controller

REDARC

The REDARC Tow-Pro Link Electric Brake Controller is a electrical component from REDARC, supplied new and sold by Urban Supply Inc as an authorized...

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$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00
Enphase Combiner Box with Breaker Hold Down Kit
$950.74 - $950.74
$950.74
$950.74 - $950.74
$950.74

Enphase Combiner Box with Breaker Hold Down Kit

Enphase Energy

The Enphase Combiner Box with Breaker Hold Down Kit is a electrical component from Enphase Energy, supplied new and sold by Urban Supply Inc as an ...

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$950.74 - $950.74
$950.74
$950.74 - $950.74
$950.74
Rich Solar NOVA 2K12 2000W 12V Pure Sine Wave Inverter with
$469.99 - $469.99
$469.99
$469.99 - $469.99
$469.99

Rich Solar NOVA 2K12 2000W 12V Pure Sine Wave Inverter with Built-in Transfer Switch UL458 Certified

Rich Solar

The Rich Solar NOVA 2K12 2000W 12V Pure Sine Wave Inverter with Built-in Transfer Switch UL458 Certified is a electrical component from Rich Solar,...

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$469.99 - $469.99
$469.99
$469.99 - $469.99
$469.99
Rich Solar NOVA 3K12 3000W 12V Pure Sine Wave Inverter with
$569.99 - $569.99
$569.99
$569.99 - $569.99
$569.99

Rich Solar NOVA 3K12 3000W 12V Pure Sine Wave Inverter with Built-in Transfer Switch UL458 Certified

Rich Solar

The Rich Solar NOVA 3K12 3000W 12V Pure Sine Wave Inverter with Built-in Transfer Switch UL458 Certified is a electrical component from Rich Solar,...

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$569.99 - $569.99
$569.99
$569.99 - $569.99
$569.99
Victron Energy Modular fuse holder for MEGA-fuse
$35.70 - $35.70
$35.70
$35.70 - $35.70
$35.70

Victron Energy Modular fuse holder for MEGA-fuse

Victron Energy

The Victron Energy Modular fuse holder for MEGA-fuse is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an...

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$35.70 - $35.70
$35.70
$35.70 - $35.70
$35.70
Briggs & Stratton Dual 200A / Split 400A Symphony? II SED
$2,171.00 - $2,171.00
$2,171.00
$2,171.00 - $2,171.00
$2,171.00

Briggs & Stratton Dual 200A / Split 400A Symphony? II SED Power Management Transfer Switch

Briggs & Stratton

The Briggs & Stratton Dual 200A / Split 400A Symphony? II SED Power Management Transfer Switch is a electrical component from Briggs & Stra...

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$2,171.00 - $2,171.00
$2,171.00
$2,171.00 - $2,171.00
$2,171.00
Discover AES 950-0049 Rackmount ESS Battery Module Combiner
$1,193.81 - $1,193.81
$1,193.81
$1,193.81 - $1,193.81
$1,193.81

Discover AES 950-0049 Rackmount ESS Battery Module Combiner

Discover

The Discover AES 950-0049 Rackmount ESS Battery Module Combiner is a electrical component from Discover, supplied new and sold by Urban Supply Inc ...

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$1,193.81 - $1,193.81
$1,193.81
$1,193.81 - $1,193.81
$1,193.81
Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00

Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge Protector with Auto Shutoff - Portable

Hughes Autoformers

The Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge Protector with Auto Shutoff - Portable is a electrical component from Hughes Autoforme...

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$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00
Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge
$215.00 - $215.00
$215.00
$215.00 - $215.00
$215.00

Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge Protector - Portable

Hughes Autoformers

The Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge Protector - Portable is a electrical component from Hughes Autoformers, supplied new a...

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$215.00 - $215.00
$215.00
$215.00 - $215.00
$215.00
Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge
$349.00 - $349.00
$349.00
$349.00 - $349.00
$349.00

Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge Protector with Auto Shutoff - Portable

Hughes Autoformers

The Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge Protector with Auto Shutoff - Portable is a electrical component from Hughes Autoforme...

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$349.00 - $349.00
$349.00
$349.00 - $349.00
$349.00
Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge
$285.00 - $285.00
$285.00
$285.00 - $285.00
$285.00

Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge Protector with Auto Shutoff - Hardwired

Hughes Autoformers

The Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge Protector with Auto Shutoff - Hardwired is a electrical component from Hughes Autoform...

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$285.00 - $285.00
$285.00
$285.00 - $285.00
$285.00
Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge
$333.00 - $333.00
$333.00
$333.00 - $333.00
$333.00

Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge Protector with Auto Shutoff - Hardwired

Hughes Autoformers

The Hughes Autoformers Power Watchdog 50 Amp Bluetooth Surge Protector with Auto Shutoff - Hardwired is a electrical component from Hughes Autoform...

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$333.00 - $333.00
$333.00
$333.00 - $333.00
$333.00
Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge
$135.00 - $135.00
$135.00
$135.00 - $135.00
$135.00

Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge Protector - Portable

Hughes Autoformers

The Hughes Autoformers Power Watchdog 30 Amp Bluetooth Surge Protector - Portable is a electrical component from Hughes Autoformers, supplied new a...

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$135.00 - $135.00
$135.00
$135.00 - $135.00
$135.00
REDARC Smart Start Load Disconnect Isolator
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00

REDARC Smart Start Load Disconnect Isolator

REDARC

The REDARC Smart Start Load Disconnect Isolator is a electrical component from REDARC, supplied new and sold by Urban Supply Inc as an authorized d...

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$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00
REDARC GMC/Cadillac/Chevy Suitable Tow-Pro Brake Controller
$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00

REDARC GMC/Cadillac/Chevy Suitable Tow-Pro Brake Controller Harness (TPH-010)

REDARC

The REDARC GMC/Cadillac/Chevy Suitable Tow-Pro Brake Controller Harness (TPH-010) is a electrical component from REDARC, supplied new and sold by U...

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$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00
REDARC Ford/Lincoln Suitable Tow-Pro Brake Controller
$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00

REDARC Ford/Lincoln Suitable Tow-Pro Brake Controller Harness (TPH-006)

REDARC

The REDARC Ford/Lincoln Suitable Tow-Pro Brake Controller Harness (TPH-006) is a electrical component from REDARC, supplied new and sold by Urban S...

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$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00
REDARC Tow-Pro Elite Electric Brake Controller
$290.00 - $290.00
$290.00
$290.00 - $290.00
$290.00

REDARC Tow-Pro Elite Electric Brake Controller

REDARC

The REDARC Tow-Pro Elite Electric Brake Controller is a electrical component from REDARC, supplied new and sold by Urban Supply Inc as an authorize...

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$290.00 - $290.00
$290.00
$290.00 - $290.00
$290.00
REDARC Infiniti/Nissan Suitable Tow-Pro Brake Controller
$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00

REDARC Infiniti/Nissan Suitable Tow-Pro Brake Controller Harness (TPH-014)

REDARC

The REDARC Infiniti/Nissan Suitable Tow-Pro Brake Controller Harness (TPH-014) is a electrical component from REDARC, supplied new and sold by Urba...

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$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00
REDARC Toyota Suitable Tow-Pro Brake Controller Harness
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

REDARC Toyota Suitable Tow-Pro Brake Controller Harness (TPH-021)

REDARC

The REDARC Toyota Suitable Tow-Pro Brake Controller Harness (TPH-021) is a electrical component from REDARC, supplied new and sold by Urban Supply ...

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$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
REDARC Tow-Pro Liberty Electric Brake Controller
$190.00 - $190.00
$190.00
$190.00 - $190.00
$190.00

REDARC Tow-Pro Liberty Electric Brake Controller

REDARC

The REDARC Tow-Pro Liberty Electric Brake Controller is a electrical component from REDARC, supplied new and sold by Urban Supply Inc as an authori...

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$190.00 - $190.00
$190.00
$190.00 - $190.00
$190.00

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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