Renogy 12V 40A DC to DC On-Board Battery Charger Temperature Control?:No This product has as built

This product has as built in Voltage Sensing Relay so will start charging your 2nd battery once the voltage from your alternator reaches 13

For a standard 400/450mm roof light you'll need 6 of these in total so that's why we sell them in packs of 6

8x Hinges

Travel light with solar

Renogy 12V 40A DC to DC On-Board Battery Charger Temperature Control?:No This product has as builtCompatible Multiple Battery Types: Compatible with a multitude of alternator types, the DC DC battery charger offers correct charging for AGM, Flooded, Gel, and Lithium batteries. Smart 3 stage Charging: The DC DC battery charger will charge your house batteries from the starter battery by 3 stage charging (Bulk, Boost, and Float), to make sure it optimally and automatically charge to 100%. Various Protections For Ultra Safety: Offers Over voltage