What is the dropout voltage? If the input is 13.6v will the charger still charge to a full battery?

Hi. The dropout voltage between the solar panel and the controller is about 0.5V-0.7V. If the input voltage is 13.6V, then it will not charge. It will charge if the input voltage is at least 15V or more.

Can I use an 18 volt solar panel to charge a 12 volt battery with this controller?

I was successful all summer using this controller with a solar panel which varied from 18V to 13V during the day. A few times I metered the output of the controller, seeing a regulated 12 v.

ASIN	B0946MWYPK
Brand	SOLPERK
Brand Name	SOLPERK
Colour	Black
Customer Reviews	4.0 out of 5 stars 407 Reviews
Display Type	LED
Item Dimensions L x W x H	5L x 8.1W x 2.1H Centimeters
Item Weight	0.23 Kilograms
Manufacturer	SOLPERK
Material	Plastic Or Metal
Material Type	Plastic Or Metal
Product Dimensions	5L x 8.1W x 2.1H Centimeters
Voltage	24 Volts

SOLPERK 10A Solar Charge Controller Waterproof Solar Panel Controller 12V/24V PWM Solar Panel Battery Intelligent Regulator for RV Boat car ，with LED Display

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