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

Color Name	ブラック
Batteries Included	No
Batteries Required	No
Brand	Sunway Solar
Manufacturer	Sunway Solar
Item Model Number	SAE Polarity Reverse Connectors
Size	3 Pack
Product Dimensions	4.6 x 1.5 x 0.8 cm; 28.35 g
Item Weight	1 Ounces

Sunway ソーラーSAE極性リバースアダプターコネクター SAE to SAE クイックディスコネクト延長ケーブル ソーラーパネルバッテリー充電器とメンテナー用 3個パック

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Sunway ソーラーSAE極性リバースアダプターコネクター SAE to SAE クイックディスコネクト延長ケーブルソーラーパネルバッテリー充電器とメンテナー用 3個パック