Tips & How-To Alternator Charging That Works (DC-DC vs. “Just a Relay”) by Boondocking Magazine October 8, 2025 by Boondocking Magazine October 8, 2025 Modern vehicles with smart alternators need DC-DC chargers for safe, consistent charging—especially with lithium house batteries. Three approaches Why DC-DC wins Field note With a 30–40A DC-DC, we routinely add ~360–480 Wh per hour …