Cannot charge after Smartlithium battery got deeply discharged

Q&A and troubleshooting
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1

I use a MultiPlus Compact with a 330ah smart lithium battery in a camper van. The battery got deeply discharged recently. The low voltage warning popped up, and the Victron Connect app shows that discharge has been disabled.

So I plugged in shore power. But the battery doesn’t start charging. However, when I connect a blue smart charger directly to the battery. The charger shows that it is charging. This seems to indicate that the battery itself is functioning.

I would like to know why charging didn’t start with the MuiltiPlus when I plug in to AC power source after a “deep” discharge.

Thank you.

1 Like
2

Do you have fuses between the inverter and battery?

Is this the inverter itself? Or the battery? Is it a victron battery? What is controlling the inverter - (BMS to inverter connection?)

3

Do you have fuses between the inverter and battery?

There is one. I confirmed that the fuse is intact.

Is this the inverter itself? Or the battery? Is it a victron battery?

It is a Victron Smart Lithium battery. The low voltage warning is from the battery. It also says “discharging disabled” on Victron Connect app.

I have a network cable between BMS and the inverter. So I think that the inverter is controlled by BMS.

4

What bms do you have exactly on the battery? Victron have a few options

5

What BMS.
Do you have the “mains detector” fitted to the multi compact?

6

I have VE.Bus BMS V2.

7

I don’t know what “mains detector” is. But if this is a separate piece of device, I doubt that I have it.

8

I also want to add that this system has been working as expected prior to the battery deep discharge.

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9

Yes. We understand that.
Basically the system ended up in a locked out condition.

It is off. There is no way for it to know you switched on mains power.

You need the mains detector as mentioned by water_rat

A mains detector and a short RJ45 UTP cable ship together with the VE.Bus BMS V2. These are needed for mains detection once the inverter/charger has been turned off by the BMS.

10

The mains detector is required if you have a metal cased multi compact.

If you have the newer multi compact apparently the mains detector is not required.

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11

From the BMS V2 manual. This happened with my test bench system.
“Q2: The batteries are empty, and the inverter/charger will not start to charge; how to get the system up and running again?
Connect a small battery charger, for example, a 5A charger, and wait for the battery voltage to get back up to 12, 24 or 48V (depending on the system voltage).”

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14

Thank you, guys. As a few have pointed out:

  1. I should have installed main detector to prevent situation like this.
  2. Without main detector, using a separate method to charge the battery will get out of this state.
15

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