On our boat, I have a Multiplus-II 12/3000/120 inverter charger linked to charge my lithium bank. We are currently in a marina with 220V power. They have provided a step-down transformer and the power to the boat is 120 volt/50Hz. When I attempt to charge my batteries, the Multiplus gets hot (135 degrees at the case), as does the cable to the batteries (180 degrees). It does charge the batteries, but I am concerned about the excessive heat. The Multiplus is set to accept a frequency range from 45-60 Hz. I’m guessing that there is something about the transformed current it doesn’t like. We never had this issue using native 120 volt shore power.
Is there a way for me to deal with this by decreasing charge current.
I connect to the Multiplus via the Cerbo GX using Victron Connect. The firmware is up to date and the battery type is set to LiFePO4.
I’ve had over-heating problems in the past myself. What orientation is your inverter mounted and is it in an enclosed space? One thing I’ve done that helps a lot is place a small USB fan blowing from the bottom over the inverter. That has helped with the heat dissipation.
A normal transformer does nothing to the sine wave, it just lowers the voltage.
Is the fan of the MultiPlus running?
Hot wires are an indication of a bad connection somewhere or the wire cross section is to small.
Thanks All. I did not realize that the case of the Multiplus being warm is normal. It topped out at about 130 degrees and ran fine. I upsized the wiring and that solved my warm wire issue.
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