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

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 current

$66.09

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Description

🔋 Power up your solar setup with confidence and style!

PLUG PLAY SOLAR READY - Includes 30cm solar extension cables with MC4 connectors for fast, safe connections.
SIMPLIFIED INSTALLATION - Non-polarized design eliminates wiring errors and speeds up setup.
UNIVERSAL COMPATIBILITY - Supports 12V-400V DC/AC systems, perfect for solar arrays, EV chargers, and more.
ROBUST SAFETY MECHANISMS - Built-in arc suppression, overload, and short circuit protection keep your system secure.
EFFORTLESS OUTDOOR DURABILITY - IP65-rated waterproof enclosure ensures reliable performance rain or shine.

The DIHOOL Solar Panel Disconnect Switch is a 30 Amp, 2-pole circuit breaker designed for versatile 12V-400V DC/AC applications. Featuring an IP65 waterproof enclosure, non-polarized terminals for easy installation, and advanced safety features like arc suppression and overload protection, it’s ideal for outdoor solar systems, EV charging, and battery isolating. Compact and user-friendly, it includes solar connectors for quick plug-and-play wiring.

Specifications

ASIN	B0B2LGDRNN
Best Sellers Rank	#22,395 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Miniature Circuit Breakers
Brand	DIHOOL
Brand Name	DIHOOL
Circuit Breaker Type	Standard
Current Rating	30 A
Customer Reviews	4.4 out of 5 stars 551 Reviews
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 Poles	2
Number of Items	1
Number of Poles	2
Part Number	DZ47X-30A-IP65-MC4
Product Dimensions	4.7"D x 2.16"W x 3.56"H
Voltage	400 volts

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