I have a mobile installation in a van, which ignores the AC input current limit and trips the AC breaker when loads are applied even if they are relatively small. The loads are all switching supplies for computers and power supplies.
With the system running with say 150W load, and adding an additional 50W load causes a loud buzzing noise, output overload warning LED to flash on briefly, the Quattro cooling fans to start and sometimes the ACin breaker to trip. Adding a larger load, say 500W, makes the situation worse and the buzzing can persist for 1 to 2 seconds, drawing in excess of 20kW from ACin 2.which causes the shore supply voltage to collapse and trips the breaker.
The buzzing does not seem correct, it is not the same sound as the earth/neutral relay switching, which is positive 'clunk'. It sounds more like an instability between input & output. Trying combinations of PowerAssist on/off, UPS on/off makes no difference, hence the return to factory defaults (see below).
Any ideas what may be going on ? Is this a faulty Quattro ?
- Quattro 48/5000/20 -2x100 firmware V494
- CCGX Colour Control firmware V2.89
- Digital Multi Control
- 4x Pylontech U3000C
The Quattro and CCGX have been returned to factory defaults with the following configuration:
- ACin 1 Generator (not connected), current limit 3.9A (900W)
- ACin 2 Shore UK grid, max current limit 12A in DMC, typically 4A to 5A via DMC control (1.1kW)
- DVCC forced
- CCL 50A
- SoC 100%
- ACout 1 load varies between 150W and 2kW
- ACout 2 load <500W
- UPS on
- PowerAssist on
Update: 1 Sep 2022
Here's an example event, exceeding the 5A input current limit. The sampling period (1 minute) has missed the peak load, but you can see how the shore supply has collapsed as a result of the excessive current drawn. This is plugged into a building gird supply. The system was running happily on batteries with a SoC=50% when the shore supply was applied.
