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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Description

⚡ Connect Smarter, Power Stronger – Never Miss a Watt!

LOCK GO - Easy self-locking mechanism for quick, tool-free installation
BUILT TO LAST - Corrosion-resistant with UV and aging endurance for long-term reliability
CERTIFIED QUALITY - CE & TUV certified with UL94-VO rated materials for safe, stable connections
WEATHERPROOF READY - IP67 waterproof rating ensures durability in all climates
POWER UP WITH CONFIDENCE - Supports up to 1000V for robust solar energy transmission

This pair of Branch Connectors (1 MMF and 1 FFM) is designed for parallel solar panel connections, featuring a 1000V rating, IP67 waterproofing, and a stable self-locking system. Made from corrosion-resistant, UV-enduring materials and certified by CE and TUV, these connectors ensure safe, durable, and easy-to-install solar power setups.

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