I have a DC source at 393-335 V (a battery) on the In side, and a 48V battery on the Out side (41-52 V).
I have discovered that when the source battery is fully charged and the target battery discharged, the DCDC shows error #18 "charger excessive current". And that there is a limit of 8 time float voltage on the In side.
Is there a way to circumvent this issue, or is it simply that the In can't be 400 V on a 48V battery ? If so, I suggest to make this very clear in the labelling and specsheet of the device, as this info is far from evident. When I read 450V In and 48V out, I take it as granted !...