How do these connect to the wire?

They plug in. They are made to connect two wires that have connections already.

How is this sae polarity connect adapter working? Does it compatible with battery tender cable?

Yes, it woks well with battery tender extension cable.

can these be used to connect harbor frieght 25w solar panels in series?

These reverse the output polarity of the panel, so to connect to identical panels, would require two connectors in series to maintain the correct polarity. For different manufacturers panel, the polarity may be different, so connecting different panels would require just one connector .

Do you sell just the regular sae? i am looking to connect battery wires and can't find them anywhere.

Yes, please check the following link:https: https://www.amazon.com/dp/B06X6LJTD6?ref=myi_title_dp&th=1 https://www.amazon.com/dp/B073158Q24?ref=myi_title_dp&th=1

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🔋 Flip the switch on polarity problems—stay powered, stay connected!

PLUG PLAY CONVENIENCE - No tools or technical skills needed for quick connection
ROBUST CURRENT HANDLING - Supports 12V/24V DC systems up to 30A safely
UNIVERSAL COMPATIBILITY - Works flawlessly with all SAE quick disconnect cables and battery tenders
EFFORTLESS POLARITY CORRECTION - Fix reversed polarity instantly without hassle
RELIABLE SOLAR POWER MAINTENANCE - Ensures your solar panel and battery setup stays perfectly connected

The Sunway Solar SAE Polarity Reverse Adapter Connectors (3-pack) provide a simple, reliable solution to correct reversed polarity issues in SAE quick disconnect extension cables. Compatible with 12V/24V DC systems and supporting up to 30A, these adapters ensure seamless connection between different brand solar chargers, battery tenders, and DC power kits, making solar power maintenance effortless and foolproof.

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Input Voltage	24 Volts
Current Rating	30 Amps
Power Plug	No Plug
Connector Type Used on Cable	SAE
Number of Ports	3
Compatible Devices	SAE-compatible devices, such as solar panels, chargers, and regulators
Specific Uses For Product	Solar Panels, Chargers, Regulators
Unit Count	3 Count
Number of Items	3
Item Weight	1 Ounces
Package Quantity	1
Item Dimensions	1.81 x 0.59 x 0.31 inches
Color	black

Sunway Solar SAE Polarity Reverse Adapter Connectors For Quick Disconnect Extension Cable, Solar Panel Battery Power Charger And Maintainer-3Pack

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