Installed and tested in a 2019 Promaster. Was providing 50 amps at idle from a 220 amp factory alternator without issue. Didn't use it as we ended up going a different route for more power for a larger battery bank. An amazing value considering it sells for $360 + tax new. All original parts included, charger, manual, and temp sensor. $175 local pickup, $200 shipped.

An independent review if you're unfamiliar with this unit. https://faroutride.com/b2b-review/ Lithionics recommends this as a DC-DC charger so you know it is a quality unit.