Beginner Question: I have four 100 watt panels going to a 30 Amp MPPT type controller, any suggestions as to which of these is the correct size amps?

Short answer is probably the 400v 30 amp breaker to match your mppt controller. Long answer is it can depend on how your solar panels are wired, in series or parallel. In series the voltages add up (most 100w are around 20v or less) and the amps stay the same. In parallel it’s the opposite. Since your four panels is under the amp and voltage limits whichever way they are connected and the mppt charge controller maxes out at 30 amps, the 400v 30A breaker will work just fine.

Hi i just recieved this item, what is the internal thickness of the copper wire in mm? or equivalent gauge in awg?

This disconnect is rated at "30 Amps", which requires the wire to be 10awg to carry that amount of current. Wire size: 10 Gauge / 2.588 mm

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DIHOOL Solar Panel Disconnect Switch, Non Polarized DC Circuit Breaker, 30 Amp, 2 Pole, 12V-400V, AC Disconnect Box Outdoor, Battery Cutoff Isolator

DIHOOL Solar Panel Disconnect Switch, Non Polarized DC Circuit Breaker, 30 Amp, 2 Pole, 12V-400V, AC Disconnect Box Outdoor, Battery Cutoff Isolator

Product ID: 460654951

Details

Brand
DIHOOL
Circuit Breaker Type
Standard
Current Rating
30 A
Mounting Type
Surface Mount
Product Dimensions
4.7"D x 2.16"W

⚡30A high current rating

💧IP65 waterproof for outdoor use

🔄Non-polarized for reversible wiring

B/.101

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Description

🔋 Power up your solar game with hassle-free, weatherproof protection!

SIMPLIFIED INSTALLATION - Non-polarized design eliminates wiring guesswork and errors, ideal for reversible motors and bidirectional current protection.
UNIVERSAL COMPATIBILITY - Supports 12V-400V DC/AC systems with 2 poles and 30A capacity, making it your go-to for solar panels, battery isolators, and small motor controls.
ENHANCED SAFETY LONGEVITY - Built-in arc squelching magnet, flame-retardant casing, silver contacts, and pure copper coils deliver superior protection against overloads and short circuits.
PLUG PLAY SOLAR CONNECTORS - Includes 30cm extension cables with solar connectors for faster, safer wiring—get your system up and running without hassle.
EFFORTLESS OUTDOOR DURABILITY - IP65-rated waterproof enclosure ensures reliable performance in any weather, perfect for rooftop solar setups or EV charging stations.

The DIHOOL Solar Panel Disconnect Switch is a robust, IP65 waterproof 2-pole circuit breaker rated for 30 amps and 12V-400V DC/AC systems. Featuring a non-polarized design for easy reversible wiring, built-in arc suppression, and premium materials, it ensures safe, reliable isolation and overload protection for solar arrays, EV chargers, and battery systems. Its transparent cover and included solar connectors make installation and monitoring effortless, making it a top choice for modern renewable energy setups.

Specifications

ASIN	B0B2LGDRNN
Best Sellers Rank	#16,843 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Miniature Circuit Breakers
Brand Name	DIHOOL
Circuit Breaker Type	Standard
Current Rating	30 A
Customer Reviews	4.4 4.4 out of 5 stars (513)
Included Components	2 pcs Solar Terminals
Item Dimensions D x W x H	4.7"D x 2.16"W x 3.56"H
Manufacturer	DIHOOL ELECTRIC
Model	DZ47X-30A-IP65-MC4
Mounting Type	Surface Mount
Number of Items	1
Number of Poles	2
Part Number	DZ47X-30A-IP65-MC4
Voltage	400 volts

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B/.101

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Panama.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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