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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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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 400A/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 300A/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 DIN35 Adapter Small / Medium / Large
$17.00 - $17.00
$17.00
$17.00 - $17.00
$17.00

Victron Energy DIN35 Adapter Small / Medium / Large - DIN35 Adapter Large (2 pcs)

Victron Energy

The Victron Energy DIN35 Adapter Small / Medium / Large is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as...

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$17.00 - $17.00
$17.00
$17.00 - $17.00
$17.00
Victron Energy DIN35 Adapter Small / Medium / Large
$14.45 - $14.45
$14.45
$14.45 - $14.45
$14.45

Victron Energy DIN35 Adapter Small / Medium / Large - DIN35 Adapter Small (2 pcs)

Victron Energy

The Victron Energy DIN35 Adapter Small / Medium / Large is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as...

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$14.45 - $14.45
$14.45
$14.45 - $14.45
$14.45
Victron Energy DIN35 Adapter Small / Medium / Large
$16.15 - $16.15
$16.15
$16.15 - $16.15
$16.15

Victron Energy DIN35 Adapter Small / Medium / Large - DIN35 Adapter Medium (2 pcs)

Victron Energy

The Victron Energy DIN35 Adapter Small / Medium / Large is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as...

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$16.15 - $16.15
$16.15
$16.15 - $16.15
$16.15
Victron Energy MEGA Fuses - Fuse Holder
$29.75 - $29.75
$29.75
$29.75 - $29.75
$29.75

Victron Energy MEGA Fuses - Fuse Holder - 200A MEGA 52V Max (1 pack)

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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$29.75 - $29.75
$29.75
$29.75 - $29.75
$29.75
Victron Energy MEGA Fuses - Fuse Holder
$19.55 - $19.55
$19.55
$19.55 - $19.55
$19.55

Victron Energy MEGA Fuses - Fuse Holder - 175A MEGA 32V Max (5 pack)

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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$19.55 - $19.55
$19.55
$19.55 - $19.55
$19.55
Victron Energy MEGA Fuses - Fuse Holder
$35.70 - $35.70
$35.70
$35.70 - $35.70
$35.70

Victron Energy MEGA Fuses - Fuse Holder - 6-Way MEGA Fuse Holder CIP050060000

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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$35.70 - $35.70
$35.70
$35.70 - $35.70
$35.70
Victron Energy Autotransformer 32A, 50A, & 100A 120/240V
$509.15 - $509.15
$509.15
$509.15 - $509.15
$509.15

Victron Energy Autotransformer 32A, 50A, & 100A 120/240V - 100A Autotransformer

Victron Energy

The Victron Energy Autotransformer 32A, 50A, & 100A 120/240V is a electrical component from Victron Energy, supplied new and sold by Urban Supp...

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$509.15 - $509.15
$509.15
$509.15 - $509.15
$509.15
Victron Energy MEGA Fuses - Fuse Holder
$15.30 - $15.30
$15.30
$15.30 - $15.30
$15.30

Victron Energy MEGA Fuses - Fuse Holder - 400A MEGA 32V Max (5 pack)

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 Autotransformer 32A, 50A, & 100A 120/240V
$451.35 - $451.35
$451.35
$451.35 - $451.35
$451.35

Victron Energy Autotransformer 32A, 50A, & 100A 120/240V - 32A Autotransformer

Victron Energy

The Victron Energy Autotransformer 32A, 50A, & 100A 120/240V is a electrical component from Victron Energy, supplied new and sold by Urban Supp...

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$451.35 - $451.35
$451.35
$451.35 - $451.35
$451.35
Victron Energy MEGA Fuses - Fuse Holder
$15.30 - $15.30
$15.30
$15.30 - $15.30
$15.30

Victron Energy MEGA Fuses - Fuse Holder - 500A MEGA 32V Max (5 pack)

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 MEGA Fuses - Fuse Holder
$19.55 - $19.55
$19.55
$19.55 - $19.55
$19.55

Victron Energy MEGA Fuses - Fuse Holder - 225A MEGA 32V Max (5 pack)

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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$19.55 - $19.55
$19.55
$19.55 - $19.55
$19.55
Victron Energy Shunt 2000A/50mV-0.5 / 3xM10
$151.30 - $151.30
$151.30
$151.30 - $151.30
$151.30

Victron Energy Shunt 2000A/50mV-0.5 / 3xM10

Victron Energy

The Victron Energy Shunt 2000A/50mV-0.5 / 3xM10 is a victron battery monitors & system monitoring from Victron Energy, supplied new and sold by...

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$151.30 - $151.30
$151.30
$151.30 - $151.30
$151.30
Victron Energy Shunt 6000A/50mV-0.5 / 5xM10
$265.20 - $265.20
$265.20
$265.20 - $265.20
$265.20

Victron Energy Shunt 6000A/50mV-0.5 / 5xM10

Victron Energy

The Victron Energy Shunt 6000A/50mV-0.5 / 5xM10 is a victron battery monitors & system monitoring from Victron Energy, supplied new and sold by...

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$265.20 - $265.20
$265.20
$265.20 - $265.20
$265.20
Victron Energy 12 Volt Plug (Cigarette Plug with 16A Fuse)
$17.00 - $17.00
$17.00
$17.00 - $17.00
$17.00

Victron Energy 12 Volt Plug (Cigarette Plug with 16A Fuse)

Victron Energy

The Victron Energy 12 Volt Plug (Cigarette Plug with 16A Fuse) is a electrical component from Victron Energy, supplied new and sold by Urban Supply...

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$17.00 - $17.00
$17.00
$17.00 - $17.00
$17.00
Victron Energy SmartSwitch DC4 - 4 Channel DC Switch
$318.64 - $318.64
$318.64
$318.64 - $318.64
$318.64

SmartSwitch DC4 - 4 Channel DC Switch

Victron Energy

The SmartSwitch DC4 - 4 Channel DC Switch is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an authorized...

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$318.64 - $318.64
$318.64
$318.64 - $318.64
$318.64
Victron Energy Cryix-CT 12/24V 120A Intelligent Battery
$49.30 - $49.30
$49.30
$49.30 - $49.30
$49.30

Victron Energy Cryix-CT 12/24V 120A Intelligent Battery Combiner

Victron Energy

The Victron Energy Cryix-CT 12/24V 120A Intelligent Battery Combiner is a victron energy battery isolators & combiners from Victron Energy, sup...

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$49.30 - $49.30
$49.30
$49.30 - $49.30
$49.30
Victron Energy SmallBMS NG
$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00

Victron Energy SmallBMS NG

Victron Energy

The Victron Energy SmallBMS NG is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an authorized dealer wit...

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$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00
Victron Energy VE.Bus BMS NG
$156.40 - $156.40
$156.40
$156.40 - $156.40
$156.40

Victron Energy VE.Bus BMS NG

Victron Energy

The Victron Energy VE.Bus BMS NG is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an authorized dealer w...

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$156.40 - $156.40
$156.40
$156.40 - $156.40
$156.40
Victron Energy VE.Direct to USB-C Interface
$31.45 - $31.45
$31.45
$31.45 - $31.45
$31.45

Victron Energy VE.Direct to USB-C Interface

Victron Energy

The Victron Energy VE.Direct to USB-C Interface is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as an auth...

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$31.45 - $31.45
$31.45
$31.45 - $31.45
$31.45
Victron VE Transfer Switch 5kVA, single phase, 200-250VAC
$356.15 - $356.15
$356.15
$356.15 - $356.15
$356.15

Victron VE Transfer Switch 5kVA, single phase, 200-250VAC

Victron Energy

The Victron VE Transfer Switch 5kVA, single phase, 200-250VAC is a electrical component from Victron Energy, supplied new and sold by Urban Supply ...

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$356.15 - $356.15
$356.15
$356.15 - $356.15
$356.15
Victron Clamp Connector for IP65 Chargers (30 amp ATO Fuse)
$16.15 - $16.15
$16.15
$16.15 - $16.15
$16.15

Victron Clamp Connector for IP65 Chargers (30 amp ATO Fuse)

Victron Energy

The Victron Clamp Connector for IP65 Chargers (30 amp ATO Fuse) is a electrical component from Victron Energy, supplied new and sold by Urban Suppl...

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$16.15 - $16.15
$16.15
$16.15 - $16.15
$16.15
Victron Energy Dual Terminal Stud M8 (5/16in) Set (1 RED/1
$30.60 - $30.60
$30.60
$30.60 - $30.60
$30.60

Victron Energy Dual Terminal Stud M8 (5/16in) Set (1 RED/1 BLACK)

Victron Energy

The Victron Energy Dual Terminal Stud M8 (5/16in) Set (1 RED/1 BLACK) is a dc distribution systems & fuses from Victron Energy, supplied new an...

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$30.60 - $30.60
$30.60
$30.60 - $30.60
$30.60

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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