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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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REDARC Gladiator/Wrangler Suitable Tow-Pro Brake Controller
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

REDARC Gladiator/Wrangler Suitable Tow-Pro Brake Controller Harness (TPH-022)

REDARC

The REDARC Gladiator/Wrangler Suitable Tow-Pro Brake Controller Harness (TPH-022) is a electrical component from REDARC, supplied new and sold by U...

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

REDARC Toyota Suitable Tow-Pro Brake Controller Harness (TPH-015)

REDARC

The REDARC Toyota Suitable Tow-Pro Brake Controller Harness (TPH-015) is a electrical component from REDARC, supplied new and sold by Urban Supply ...

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$27.00 - $27.00
$27.00
$27.00 - $27.00
$27.00
Spartan Power 300A Battery Combiner / Selector Switch 4
$35.66 - $35.66
$35.66
$35.66 - $35.66
$35.66

Spartan Power 300A Battery Combiner / Selector Switch 4 Position

Spartan Power

The Spartan Power 300A Battery Combiner / Selector Switch 4 Position is a electrical component from Spartan Power, supplied new and sold by Urban S...

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$35.66 - $35.66
$35.66
$35.66 - $35.66
$35.66
Spartan Power 24 Volt Dual Power Solar & Wind Transfer
$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00

Spartan Power 24 Volt Dual Power Solar & Wind Transfer Switch

Spartan Power

The Spartan Power 24 Volt Dual Power Solar & Wind Transfer Switch is a electrical component from Spartan Power, supplied new and sold by Urban ...

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$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00
PowerMax 50 Amp Transfer Switch PMTS-50
$175.00 - $175.00
$175.00
$175.00 - $175.00
$175.00

PowerMax 50 Amp Transfer Switch PMTS-50

PowerMax

The PowerMax 50 Amp Transfer Switch PMTS-50 is a electrical component from PowerMax, supplied new and sold by Urban Supply Inc as an authorized dea...

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$175.00 - $175.00
$175.00
$175.00 - $175.00
$175.00
Power Bright 1500 Watt Step Up / Down Voltage Transformer
$97.14 - $97.14
$97.14
$97.14 - $97.14
$97.14

Power Bright 1500 Watt Step Up / Down Voltage Transformer VC-1500W

Power Bright

The Power Bright 1500 Watt Step Up / Down Voltage Transformer VC-1500W is a electrical component from Power Bright, supplied new and sold by Urban ...

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$97.14 - $97.14
$97.14
$97.14 - $97.14
$97.14
PowerMax 30 Amp Transfer Switch PMTS-30
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

PowerMax 30 Amp Transfer Switch PMTS-30

PowerMax

The PowerMax 30 Amp Transfer Switch PMTS-30 is a electrical component from PowerMax, supplied new and sold by Urban Supply Inc as an authorized dea...

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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
Power Bright 200 Watt Step Up / Down Voltage Transformer
$27.14 - $27.14
$27.14
$27.14 - $27.14
$27.14

Power Bright 200 Watt Step Up / Down Voltage Transformer VC200W

Power Bright

The Power Bright 200 Watt Step Up / Down Voltage Transformer VC200W is a electrical component from Power Bright, supplied new and sold by Urban Sup...

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$27.14 - $27.14
$27.14
$27.14 - $27.14
$27.14
Power Bright 750 Watt Step Up / Down Voltage Transformer
$48.57 - $48.57
$48.57
$48.57 - $48.57
$48.57

Power Bright 750 Watt Step Up / Down Voltage Transformer VC-750W

Power Bright

The Power Bright 750 Watt Step Up / Down Voltage Transformer VC-750W is a electrical component from Power Bright, supplied new and sold by Urban Su...

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$48.57 - $48.57
$48.57
$48.57 - $48.57
$48.57
Power Bright 500 Watt Step Up / Down Voltage Transformer
$38.57 - $38.57
$38.57
$38.57 - $38.57
$38.57

Power Bright 500 Watt Step Up / Down Voltage Transformer VC500W

Power Bright

The Power Bright 500 Watt Step Up / Down Voltage Transformer VC500W is a electrical component from Power Bright, supplied new and sold by Urban Sup...

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$38.57 - $38.57
$38.57
$38.57 - $38.57
$38.57
Power Bright 300 Watt Step Up / Down Voltage Transformer
$31.43 - $31.43
$31.43
$31.43 - $31.43
$31.43

Power Bright 300 Watt Step Up / Down Voltage Transformer VC300W

Power Bright

The Power Bright 300 Watt Step Up / Down Voltage Transformer VC300W is a electrical component from Power Bright, supplied new and sold by Urban Sup...

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$31.43 - $31.43
$31.43
$31.43 - $31.43
$31.43
Power Bright 3000 Watt Step up / Down Voltage Transformer
$119.99 - $119.99
$119.99
$119.99 - $119.99
$119.99

Power Bright 3000 Watt Step up / Down Voltage Transformer VC-3000W

Power Bright

The Power Bright 3000 Watt Step up / Down Voltage Transformer VC-3000W is a electrical component from Power Bright, supplied new and sold by Urban ...

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$119.99 - $119.99
$119.99
$119.99 - $119.99
$119.99
KISAE 2000 Watt 12V PSW Inverter with Transfer Switch
$399.99 - $399.99
$399.99
$399.99 - $399.99
$399.99

KISAE 2000 Watt 12V PSW Inverter with Transfer Switch SWXFR1220

KISAE

The KISAE 2000 Watt 12V PSW Inverter with Transfer Switch SWXFR1220 is a electrical component from KISAE, supplied new and sold by Urban Supply Inc...

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$399.99 - $399.99
$399.99
$399.99 - $399.99
$399.99
Morningstar Relay Driver for TriStar Controllers RD-1
$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00

Morningstar Relay Driver for TriStar Controllers RD-1

Morningstar

The Morningstar Relay Driver for TriStar Controllers RD-1 is a electrical component from Morningstar, supplied new and sold by Urban Supply Inc as ...

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$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00
KISAE 1000 Watt 12V PSW Inverter with Transfer Switch
$304.99 - $304.99
$304.99
$304.99 - $304.99
$304.99

KISAE 1000 Watt 12V PSW Inverter with Transfer Switch SWXFR1210

KISAE

The KISAE 1000 Watt 12V PSW Inverter with Transfer Switch SWXFR1210 is a electrical component from KISAE, supplied new and sold by Urban Supply Inc...

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$304.99 - $304.99
$304.99
$304.99 - $304.99
$304.99
KISAE 3000 Watt 12V PSW Inverter with Transfer Switch
$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99

KISAE 3000 Watt 12V PSW Inverter with Transfer Switch SWXFR1230

KISAE

The KISAE 3000 Watt 12V PSW Inverter with Transfer Switch SWXFR1230 is a electrical component from KISAE, supplied new and sold by Urban Supply Inc...

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$499.99 - $499.99
$499.99
$499.99 - $499.99
$499.99
COTEK 40A Universal Transfer Switch TR40
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00

COTEK 40A Universal Transfer Switch TR40

COTEK

The COTEK 40A Universal Transfer Switch TR40 is a electrical component from COTEK, supplied new and sold by Urban Supply Inc as an authorized deale...

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$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
AIMS Power 1200 Pure Sine Inverter with Transfer Switch
$378.40 - $378.40
$378.40
$378.40 - $378.40
$378.40

AIMS Power 1200 Pure Sine Inverter with Transfer Switch UL458 Hardwire Only

AIMS Power

The AIMS Power 1200 Pure Sine Inverter with Transfer Switch UL458 Hardwire Only is a electrical component from AIMS Power, supplied new and sold by...

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$378.40 - $378.40
$378.40
$378.40 - $378.40
$378.40
Aims Power Ignition or Toggle Relay Switch
$50.60 - $50.60
$50.60
$50.60 - $50.60
$50.60

Aims Power Ignition or Toggle Relay Switch

AIMS Power

The Aims Power Ignition or Toggle Relay Switch is a electrical component from AIMS Power, supplied new and sold by Urban Supply Inc as an authorize...

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$50.60 - $50.60
$50.60
$50.60 - $50.60
$50.60
EG4 Electronics BSB 90A AC Circuit Breaker Compatible with
$44.00 - $44.00
$44.00
$44.00 - $44.00
$44.00

BSB 90A AC Circuit Breaker Compatible with EG4 FlexBOSS21 Hybrid Inverter

EG4 Electronics

The BSB 90A AC Circuit Breaker Compatible with EG4 FlexBOSS21 Hybrid Inverter is a electrical component from EG4 Electronics, supplied new and sold...

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$44.00 - $44.00
$44.00
$44.00 - $44.00
$44.00
EG4 Electronics BSB 70A AC Circuit Breaker Compatible with
$38.99 - $38.99
$38.99
$38.99 - $38.99
$38.99

BSB 70A AC Circuit Breaker Compatible with EG4 18kPV Hybrid Inverter

EG4 Electronics

The BSB 70A AC Circuit Breaker Compatible with EG4 18kPV Hybrid Inverter is a electrical component from EG4 Electronics, supplied new and sold by U...

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$38.99 - $38.99
$38.99
$38.99 - $38.99
$38.99
EG4 Electronics BSB 50A AC Circuit Breaker Compatible with
$38.99 - $38.99
$38.99
$38.99 - $38.99
$38.99

BSB 50A AC Circuit Breaker Compatible with EG4 12kPV Hybrid Inverter

EG4 Electronics

The BSB 50A AC Circuit Breaker Compatible with EG4 12kPV Hybrid Inverter is a electrical component from EG4 Electronics, supplied new and sold by U...

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$38.99 - $38.99
$38.99
$38.99 - $38.99
$38.99
Green Vista Living EG4 GridBOSS MID 200A Service Entrance v3.1 Power Inverter - Side View
Green Vista Living EG4 GridBOSS MID 200A Service Entrance v3.1 Power Inverter
$1,999.99
$1,999.99 - $1,999.99
$1,999.99
$1,799.99
$1,799.99 - $1,799.99
$1,799.99

EG4 GridBOSS MID 200A Service Entrance v3.1

EG4 Electronics

EG4 GridBOSS Micro-Grid Interconnection Device (MID) v3.1 Simplify and Optimize Your ESS The EG4 GridBOSS MID simplifies your Energy Storage System...

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$1,999.99
$1,999.99 - $1,999.99
$1,999.99
$1,799.99
$1,799.99 - $1,799.99
$1,799.99
Victron ArgoFET Battery Isolators
$119.85 - $119.85
$119.85
$119.85 - $119.85
$119.85

Victron ArgoFET Battery Isolators - Argofet 200-2 Two batteries 200A

Victron Energy

The Victron ArgoFET Battery Isolators is a power equipment from Victron Energy, supplied new and sold by Urban Supply Inc as an authorized dealer w...

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$119.85 - $119.85
$119.85
$119.85 - $119.85
$119.85

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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