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

⚡30 Amp high-capacity current rating

💧IP65 waterproof for outdoor durability

🔄Non-polarized 2-pole for reversible wiring

€ 65.71

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Cut the cord, not the power – stay connected, stay protected!

POWERFUL 30 AMP CAPACITY - Handles up to 30A with ease, supporting robust solar arrays and high-demand battery systems without breaking a sweat.
WEATHERPROOF READY FOR OUTDOORS - IP65-rated enclosure ensures reliable performance rain or shine, perfect for rooftop solar setups or EV charging stations.
ENHANCED SAFETY WITH MULTI PROTECTION - Built-in short circuit, overload, and isolation protections keep your system secure and your investments safe.
TRANSPARENT COVER FOR INSTANT STATUS CHECK - Quick visual access to breaker status means less downtime and more control at a glance.
SIMPLIFIED INSTALLATION WITH NON POLARIZED DESIGN - No polarity worries—connect in any direction to save time and avoid costly wiring errors, ideal for reversible motor and battery applications.

The DIHOOL Solar Panel Disconnect Switch is a rugged, 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 multiple safety protections, it’s engineered for seamless integration with solar panels, EV chargers, and battery systems—making it a must-have for modern, efficient energy management.

Specifications

ASIN	B0B2LGDRNN
Best Sellers Rank	#14,080 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 (519)
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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€ 65.71

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered 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 Belgium.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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