The two positives make a negative and the two negatives make a positive?

NO. The two positives connect to the connectors and the connector has a positive connector out. The positive and negative do not change.

I have ten 12 v 100 watt 4.5 amp panels I need to set up in parallel that will put out 45 amps will these work

No. These are rated at 30 amps max. Why in the world would you want 45 amps instead of a higher voltage (series/parallel combo)? 45A will require 4/0 wire or larger from your array. It will have an insane voltage drop if you go with less for over a run of 8 feet or so. Re-engineer your design.

I have 2 Strings of 3x280w 40voc panels in series. Can I parallel the two strings using these branch connectors?

The connectors will work. Just be sure the input voltage and amperage is right for you application. Take the panel specs and equipment specs to a good solar installer or electrician if you aren’t sure.

After 2days use one of the male ends kinda like melted any ideas why ?

Slightly loose connection or too many amps.

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Branch Connectors Solar Connectors Y Connector in Pair MMF+FFM for Parallel Connection Between Solar Panels … (5 Pairs)

Branch Connectors Solar Connectors Y Connector in Pair MMF+FFM for Parallel Connection Between Solar Panels … (5 Pairs)

Product ID: 201277828

Details

Color
Black
Connector Type
Solar Or T
Contact Material
Copper
Insulation Material
PPO + PA
Terminal
Spade Terminal

💧Waterproof IP67 rating

🔗Stable self-locking system

☀️UV & corrosion resistant

Description

🔌 Power up your solar game with connectors that never quit!

LONG TERM SOLAR PARTNER - UV endurance and aging resistance guarantee your solar system stays efficient season after season.
TOOL FREE QUICK ASSEMBLY - Lock and unlock connectors easily without any extra tools—perfect for on-the-go setups.
EFFORTLESS PARALLEL POWER - Seamlessly connect multiple solar panels with MMF + FFM Y connectors for maximum energy output.
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof and corrosion-resistant design ensures reliable performance rain or shine.
CERTIFIED QUALITY ASSURANCE - CE and TUV certified with UL94-VO hard plastic for safe, stable, and durable connections.

These Branch Connectors Solar Y Connectors (5 pairs) feature MMF and FFM female cables designed for parallel solar panel connections. With a stable self-locking system, IP67 waterproof rating, corrosion and UV resistance, plus CE and TUV certifications, they ensure durable, safe, and easy-to-assemble solar setups for long-term energy efficiency.

Specifications

ASIN	B07HGM97W5
Best Sellers Rank	#453,048 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #2,516 in Solar & Wind Power Parts & Accessories
Brand Name	LINKPAL
Color	Black
Connector Gender	Both
Connector Type	Solar Connector Or T Connector
Contact Material	Copper
Customer Reviews	4.7 4.7 out of 5 stars (1,261)
Insulation Material Type	PPO + PA
Manufacturer	LINKPAL
Material Type	Plastic
Maximum Voltage	1000 volts
Model	[Predicted Model Number]
Part Number	736900423174
Temperature Rating	90 degree celsius
Terminal	Spade Terminal
UPC	736900423174

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