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Charger Hum (1 Viewer)
- Thread starter Folkranger
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OP
OP
Strange. Been on loud all night. Turn the hot tap on this morning and it goes off. An hour later its still quiet.
It’s this hum with ehu plugged in only?
when you brew a cuppa, is it with ehu or without?
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I think there's a number of things going on here. I have a Victron Multiplus 2, and that hums more or less whatever I do. It's mounted on the garage front wall (thin board), and it just hooks onto the mounting plate, and is secured by two screws.
First, the hum is amplified by the thin board. The Multiplus can move slightly on the plate, when driving for example, so the contact between the board and multiplus can vary, and so can the hum. Maybe some rubber mounting points would improve it, like it does for water pumps etc.
The fixed bed is just above the garage, and the hum, although quiet, is loud enough to be disturbing. Plan A was to switch everything from inverter to pass-through at night, and switch off the inverter. That for some reason doesn't work, everything just goes off when I switch the inverter off.
Plan B is an auto-changeover relay which switches everything ON when the inverter is ON, and switches everything to EHU if the inverter is OFF. That's the opposite to what is normally done. If there's no EHU, everything goes off when I switch the inverter off, but that's OK. Now I can turn the inverter off, and get either just EHU or nothing - and no hum. The inverter switch is inside the MH, on the wall. Actually it's a Cerbo GX control panel, but a Multiplus control panel would work just the same.
First, the hum is amplified by the thin board. The Multiplus can move slightly on the plate, when driving for example, so the contact between the board and multiplus can vary, and so can the hum. Maybe some rubber mounting points would improve it, like it does for water pumps etc.
The fixed bed is just above the garage, and the hum, although quiet, is loud enough to be disturbing. Plan A was to switch everything from inverter to pass-through at night, and switch off the inverter. That for some reason doesn't work, everything just goes off when I switch the inverter off.
Plan B is an auto-changeover relay which switches everything ON when the inverter is ON, and switches everything to EHU if the inverter is OFF. That's the opposite to what is normally done. If there's no EHU, everything goes off when I switch the inverter off, but that's OK. Now I can turn the inverter off, and get either just EHU or nothing - and no hum. The inverter switch is inside the MH, on the wall. Actually it's a Cerbo GX control panel, but a Multiplus control panel would work just the same.
OP
OP
All and only with hookup
OP
OP
Sounds like a plan. Will look into all ideas once hone next week.
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Thats a indication of NOT transformer humming. With Hookup present, the multiplus it performs as pass through power, not inverting. You may have a dry relay that closes on AC in present. It’s rare, but has been cases with dry contacts on relays. A polish guy did a nice trouble shoot with a de soldered relay, and easy fix. The inverter as a unit is robust, but, with added mobile vibration can cause hidden loose contacts.
OP
OP
I reduced battery by 10% by boiling kettle using inverter/mains off and the buzzing has gone. 11 hours now without a buzz despite mains taking battery back up to 100%.
OP
OP
Five days on and buzzing still gone
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OP
OP
One year later, away for 5 weeks and buzzing is back. Just so annoying. Obviously I haven't done anything to stop it as it stopped itself.
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