Here's directly from Lifeline. 3 stage charger- Bulk 14.2-14.4 volts; Acceptance 14.2-14.4 volts; Float 13.2-13.3 volts. Equalize after fully charged at 15.5 volts for 8 hours (only if showing symptoms of capacity loss). State of charge- 100% 12.8 volts or more; 75% 12.55 volts; 50% 12.2 volts; 25% 11.75 volts; 0% 10.5 volts. Lifeline recommends sizing batteries twice what you need and recharge when at 50% and recharge 100%. I have 2-8D's and am very satisfied with them. I have my three stage set like above pumping in 85 amps at 12v. at the beginning. They should easily last 5 years. Good Luck, TomC
My Xantrex RS3000 does not enable equalize mode when set to AGM type battery.