Features:
Dual battery charging
12V/ 24V auto work
Battery type selection
PWM Charge mode
Digital LED Indicator Light
Temperature compensation
Easy operation with 4 keys
Electronic protection
Over load protection
Short circuit protection
Reverse polarity protection
Over charging or discharging protection
Reverse current protection during night

Specifications :
Solar System:12V/24V Auto recognition
Battery Types:Sealed, Flooded, VRLA(GEL, AGM)
Rated Charge & Discharge Current: 20A
Max PV Input Power:240W (12V),480W(24V)
Max Solar Input Voltage: 30V (12V), 55V (24V)
Operating Temperature: -31°F to +131°F

TROUBLESHOOTING
Look at the indicator light in the upper left corner of the controller.
1. Indicator light blinking, short circuit, check thePV and battery, and make sure that they are in correct connection
2. Indicator light slowly flashing，fully charged
3. Indicator light ON, on charging
4. Indicator light frequent flashing, with battery, no charging
5. Indicator light OFF, no battery，or over voltage

Package include:
1 x 20A Duo Battery Solar Charge Controller
1 x User Manual in English

Make sure this fits by entering your model number.
Fit for RVs,Caravans and boats which with two batteries. Support 3 battery types: GEL,Flooded,Sealed
Battery Voltage: 12V/24V auto; Rated Charge & Discharge Current: 20A
High efficient PWM charging, improve the solar system performance and protect the battery
Protection: over charging, short-circuit, reverse polarity, revert current to PV
12 months warranty and professional after-sale service.