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Hello RiffRaff1. Thank you for your inquiry. You do not need to be concerned about alternator damage during the charging process, provided that a properly rated DC-DC battery charger (such as Renogy’s 20A or 40A models) is used. These chargers are designed to regulate the current from the alternator, ensuring safe and efficient charging without placing excessive strain on the vehicle’s electrical system. Regarding compatibility with a 400-watt solar array, the Renogy 12V 100Ah Deep Cycle AGM Battery is well-suited for this application. A 400W solar setup can typically generate approximately 120 to 160 amp-hours per day, depending on environmental conditions and location. This level of input is compatible with a single 100Ah battery, though a larger battery bank may be advisable for extended autonomy or heavier power demands. We hope this information helps!
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