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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 smallBMS with pre-alarm (formally miniBMS)
$49.30 - $49.30
$49.30
$49.30 - $49.30
$49.30

Victron smallBMS with pre-alarm (formally miniBMS)

Victron Energy

The Victron smallBMS with pre-alarm (formally miniBMS) is a electrical component from Victron Energy, supplied new and sold by Urban Supply Inc as ...

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$49.30 - $49.30
$49.30
$49.30 - $49.30
$49.30
Green Vista Living EG4 GridBOSS Breaker Kit - 90A Bathroom Vanity - Side View
Green Vista Living EG4 GridBOSS Breaker Kit - 90A Bathroom Vanity
$399.00
$399.00 - $399.00
$399.00
$272.99
$272.99 - $272.99
$272.99

EG4 GridBOSS Breaker Kit - 90A

EG4 Electronics

EG4 GridBOSS Breaker Kit - 90A The GridBOSS Breaker Kit - 90A is a complete, pre-bundled set of BSB breakers designed specifically for the EG4 Grid...

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$399.00
$399.00 - $399.00
$399.00
$272.99
$272.99 - $272.99
$272.99
Victron Fuse holder for MEGA-fuse - Victron Fuse holder for MEGA-fuse showing transparent blue cover over bolts Sold out
$15.30 - $15.30
$15.30
$15.30 - $15.30
$15.30

Victron Fuse holder for MEGA-fuse

Victron Energy
Out of stock

The Victron Fuse holder for MEGA-fuse is an electrical component from Victron Energy, stocked by Urban Supply for solar and storage builds.Why It M...

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$15.30 - $15.30
$15.30
$15.30 - $15.30
$15.30
Sold out
Victron MEGA-fuse 300A/80V (package of 5 pcs) - Victron MEGA-fuse 300A/80V close up
$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75

Victron MEGA-fuse 300A/80V (package of 5 pcs)

Victron Energy

The Victron MEGA-fuse 300A/80V (package of 5 pcs) is an electrical component from Victron Energy — 300A; 80V.Why It MattersA fuse is the one compon...

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$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75
Victron MEGA-fuse 60A/80V (package of 5 pcs) - Victron MEGA-fuse 60A/80V
$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75

Victron MEGA-fuse 60A/80V (package of 5 pcs)

Victron Energy

The Victron MEGA-fuse 60A/80V (package of 5 pcs) is an electrical component from Victron Energy — 60A, 80V, supplied as a pack of 5.Why It MattersA...

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$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75
Victron Single Fuse Holder - Victron single MEGA fuse holder black fuse mounting base on a white background.
Victron Single Fuse Holder - Victron single MEGA fuse holder with transparent cover and black fuse mounting base on a white background.
$35.70 - $35.70
$35.70
$35.70 - $35.70
$35.70

Victron Single Fuse Holder

Victron Energy

The Victron Single Fuse Holder is an electrical component from Victron Energy — a single holder for Victron MEGA-fuses.Why It MattersA fuse is only...

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$35.70 - $35.70
$35.70
$35.70 - $35.70
$35.70
Victron Fuse holder for ANL-fuse - Victron Fuse holder for ANL-fuse angled right close up view bolts in black bar
$15.00
$15.00 - $15.00
$15.00
$12.75
$12.75 - $12.75
$12.75

Victron Fuse holder for ANL-fuse

Victron Energy

The Victron Fuse holder for ANL-fuse is an electrical component from Victron Energy, stocked by Urban Supply for solar and storage builds.Why It Ma...

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$15.00
$15.00 - $15.00
$15.00
$12.75
$12.75 - $12.75
$12.75
Staubli - 15A - 1500V - In-Line Fuse - Staubli 15A 1500V in-line fuse with labeled MC4 PV connectors, showing detailed view of the internal fuse and connector ends for solar PV installations.
Staubli - 15A - 1500V - In-Line Fuse - Staubli 15A 1500V in-line fuse with MC4 connectors, featuring a durable black housing and pre-attached cables for secure solar PV circuit protection.
$30.88 - $30.88
$30.88
$30.88 - $30.88
$30.88

Staubli - 15A - 1500V - In-Line Fuse

Staubli

The Staubli - 15A - 1500V - In-Line Fuse is an electrical component from Staubli — 15A; 1500 V.Why It MattersA fuse is the one component in a DC sy...

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$30.88 - $30.88
$30.88
$30.88 - $30.88
$30.88
Victron Fuse CNN 325A/80V for Victron Lynx Shunt (1 pc) - Victron Fuse CNN 325A/80V for Victron Lynx Shunt close up angled left
$64.60 - $64.60
$64.60
$64.60 - $64.60
$64.60

Victron Fuse CNN 325A/80V for Victron Lynx Shunt (1 pc)

Victron Energy

The Victron Fuse CNN 325A/80V for Victron Lynx Shunt (1 pc) is an electrical component from Victron Energy — 325A; 80V.Why It MattersA fuse is the ...

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$64.60 - $64.60
$64.60
$64.60 - $64.60
$64.60
Victron Energy - MIDI-fuse 200A/32V (pack of 5 pcs) - Victron Energy | MEGA-fuse 200A/32V close up view
$17.00
$17.00 - $17.00
$17.00
$15.30
$15.30 - $15.30
$15.30

Victron Energy - MIDI-fuse 200A/32V (pack of 5 pcs)

Victron Energy

The Victron Energy - MIDI-fuse 200A/32V (pack of 5 pcs) is an electrical component from Victron Energy — 200A; 32V.Why It MattersA fuse is the one ...

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$17.00
$17.00 - $17.00
$17.00
$15.30
$15.30 - $15.30
$15.30
Staubli - 20A - 1500V - In-Line Fuse - Staubli 20A 1500V in-line fuse with labeled MC4 PV connectors, showing detailed view of the internal fuse and connector ends for solar PV installations.
Staubli - 20A - 1500V - In-Line Fuse - Staubli 20A 1500V in-line fuse with MC4 connectors, featuring a durable black housing and pre-attached cables for secure solar PV circuit protection.
$31.29 - $31.29
$31.29
$31.29 - $31.29
$31.29

Staubli - 20A - 1500V - In-Line Fuse

Staubli

The Staubli - 20A - 1500V - In-Line Fuse is an electrical component from Staubli — 20A; 1500V.Why It MattersA fuse is the one component in a DC sys...

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$31.29 - $31.29
$31.29
$31.29 - $31.29
$31.29
Victron MEGA-fuse 200A/80V (package of 5 pcs) - 5 Victron Energy Mega Fuses slanted
Victron MEGA-fuse 200A/80V (package of 5 pcs) - Victron Energy Mega Fuse slanted
$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75

Victron MEGA-fuse 200A/80V (package of 5 pcs)

Victron Energy

The Victron MEGA-fuse 200A/80V (package of 5 pcs) is an electrical component from Victron Energy — 200A; 80V.Why It MattersA fuse is the one compon...

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$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75
Victron MEGA-fuse 125A/80V - Package of 5 pcs - Victron MEGA-fuse 125A/80V five pack facing forward
$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75

Victron MEGA-fuse 125A/80V - Package of 5 pcs

Victron Energy

The Victron MEGA-fuse 125A/80V - Package of 5 pcs is an electrical component from Victron Energy — 125A; 80V.Why It MattersA fuse is the one compon...

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$46.75 - $46.75
$46.75
$46.75 - $46.75
$46.75
Victron ANL-fuse 500A/80V for 48V products (1 pc) - Victron ANL-fuse 500A/80V for 48V products close up angled left
$6.80 - $6.80
$6.80
$6.80 - $6.80
$6.80

Victron ANL-fuse 500A/80V for 48V products (1 pc)

Victron Energy

The Victron ANL-fuse 500A/80V for 48V products (1 pc) is an electrical component from Victron Energy — 500A; 80V.Why It MattersA fuse is the one co...

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$6.80 - $6.80
$6.80
$6.80 - $6.80
$6.80
Victron ANL-fuse 300A/80V (package of 5 pcs) - front view of the Victron 300A/80V fuse
$40.80 - $40.80
$40.80
$40.80 - $40.80
$40.80

Victron ANL-fuse 300A/80V (package of 5 pcs)

Victron Energy

The Victron ANL-fuse 300A/80V (package of 5 pcs) is an electrical component from Victron Energy — 300A; 80V.Why It MattersA fuse is the one compone...

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$40.80 - $40.80
$40.80
$40.80 - $40.80
$40.80
Tigo 200A MCB Auto Transfer Switch - Backup/Grid/Generator - Front view of Tigo ATS automatic transfer switch with integrated display and logo
$2,619.00 - $2,619.00
$2,619.00
$2,619.00 - $2,619.00
$2,619.00

Tigo 200A MCB Auto Transfer Switch - Backup/Grid/Generator

Tigo Energy

The generator-capable Tigo 200A MCB Automatic Transfer Switch — grid, solar, battery and a pure sine wave generator up to 24kW with 2-wire start, a...

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$2,619.00 - $2,619.00
$2,619.00
$2,619.00 - $2,619.00
$2,619.00
Enphase IQ System Controller 3G - Generator Integration - Enphase IQ System Controller 3G side view
Enphase IQ System Controller 3G - Generator Integration - Enphase IQ System Controller 3G front facing
$3,599.99
$3,599.99 - $3,599.99
$3,599.99
$3,050.00
$3,050.00 - $3,050.00
$3,050.00

Enphase IQ System Controller 3G - Generator Integration

Enphase Energy

The IQ System Controller 3G is the generator-integrated version of Enphase's microgrid interconnection device — the same interconnection, transfer ...

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$3,599.99
$3,599.99 - $3,599.99
$3,599.99
$3,050.00
$3,050.00 - $3,050.00
$3,050.00
Enphase IQ System Controller 3 - Enphase IQ System Controller 3 side view
Enphase IQ System Controller 3 - Enphase IQ System Controller 3 front facing
$2,599.00
$2,599.00 - $2,599.00
$2,599.00
$2,199.00
$2,199.00 - $2,199.00
$2,199.00

Enphase IQ System Controller 3

Enphase Energy

The Enphase IQ System Controller 3 is the microgrid interconnection device for an Enphase energy system — the box that decides, automatically and i...

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$2,599.00
$2,599.00 - $2,599.00
$2,599.00
$2,199.00
$2,199.00 - $2,199.00
$2,199.00
Growatt 5kW Split Phase Transformer - ATS 5000T-ES - Growatt 5kW Split Phase Transformer angled left
$329.00
$329.00 - $329.00
$329.00
$269.00
$269.00 - $269.00
$269.00

Growatt 5kW Split Phase Transformer - ATS 5000T-ES

Growatt

The Growatt 5kW Split Phase Transformer - ATS 5000T-ES is an electrical component from Growatt — 5kW; 240Vac.Why It MattersOvercurrent protection a...

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$329.00
$329.00 - $329.00
$329.00
$269.00
$269.00 - $269.00
$269.00
Growatt RS485 / CAN Hub - 8 Port - Growatt RS485 / CAN Hub with 8 ports, used for connecting 1 battery bank and up to 7 Growatt inverters or charge controllers
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Growatt RS485 / CAN Hub - 8 Port

Growatt

The Growatt RS485 / CAN Hub - 8 Port is an electrical component from Growatt, stocked by Urban Supply for solar and storage builds.Why It MattersA ...

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$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
GoodWe Automatic Backup Device - GoodWe Automatic Backup Device angled view with LED indicators
GoodWe Automatic Backup Device - GoodWe Automatic Backup Device front view with control panel display
$1,458.90 - $1,458.90
$1,458.90
$1,458.90 - $1,458.90
$1,458.90

GoodWe Automatic Backup Device

GoodWe

The GoodWe Automatic Backup Device is an electrical component from GoodWe, stocked by Urban Supply for solar and storage builds.Why It MattersThe c...

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$1,458.90 - $1,458.90
$1,458.90
$1,458.90 - $1,458.90
$1,458.90
Enphase IQ Load Controller - Enphase IQ Load Controller
$629.00
$629.00 - $629.00
$629.00
$449.00
$449.00 - $449.00
$449.00

Enphase IQ Load Controller

Enphase Energy

The Enphase IQ Load Controller is an electrical component from Enphase Energy — 240 VAC; 120 VAC.Why It MattersLoad control is what lets a smaller ...

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$629.00
$629.00 - $629.00
$629.00
$449.00
$449.00 - $449.00
$449.00
IMO Emergency Stop Button - Twist to release - 500VAC - 1NO + 1NC - Emergency Stop Twist Button yellow box with red button front view
$26.67 - $26.67
$26.67
$26.67 - $26.67
$26.67

IMO Emergency Stop Button - Twist to release - 500VAC - 1NO + 1NC

IMO Solar

The IMO Emergency Stop Button - Twist to release - 500VAC - 1NO + 1NC is an electrical component from IMO Solar — 500VAC.Why It MattersThe componen...

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$26.67 - $26.67
$26.67
$26.67 - $26.67
$26.67
IMO Emergency Stop Pull Button - 500VAC - 1NO + 1NC - Emergency Stop Pull Button yellow box with red button sticking out front view
$41.81 - $41.81
$41.81
$41.81 - $41.81
$41.81

IMO Emergency Stop Pull Button - 500VAC - 1NO + 1NC

IMO Solar

The IMO Emergency Stop Pull Button - 500VAC - 1NO + 1NC is an electrical component from IMO Solar — 500VAC; 40mm.Why It MattersBreakers, disconnect...

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$41.81 - $41.81
$41.81
$41.81 - $41.81
$41.81

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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