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macevedo avatar image

Why Ve BUS Low battery alarm

The VE BUS is giving a low battery alarm while the battery voltage is normal in the BMS. See picture below. There was a high current draw event and after the VE BUS voltage started swinging low when the inverter mode kicks in. Any ideas how to resolve this? The system is a split phase with 2 Quattro's and BYD battery bank of 7.5 kWh.


MultiPlus Quattro Inverter ChargerBMSBYDlow battery warning
1563249890579.png (158.8 KiB)
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JohnC avatar image
JohnC answered ·

Hi M. It might be time to drag out that trusty $20 multimeter. Firstly to confirm those V's, and then to determine where the difference is occurring in your circuits. Could be a 'dry' connector or a dicky breaker or fuse, something like that. Hot spots? On both +ve and -ve circuits.

Your wires should be quite large, and probably easily checked.

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