question

mouzer23 avatar image
mouzer23 asked

Voltage drop

Hi,

Can anyone explain as to why i would have such a sudden voltage drop when inverting?

After 3 min voltage drops from 52.00v to 49.30v.

4 x 12v lead acid batteries wired in series

1x smart shunt connected to 3KVA Multiplus II



screenshot-2023-06-28-184928.jpg
battery capacity
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

2 Answers
Alexandra avatar image
Alexandra answered ·

@mouzer23

Assuming the shunt is installed close to the battery... the possibilitiea are....

1. A loose connection

2. A large draw item/load switched on

3. High battery/cable resistance. Can happen if the batteries are undersized.

2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

mouzer23 avatar image
mouzer23 answered ·

Thanks for the response Alexandra,

I think my concern is how significant the initial drop is before it becomes more linear.

The below shows Grid AC loss for 2 hours the the below DC readings.

screenshot-2023-06-29-121301.jpg

Then here is a comparison between inverter output:

screenshot-2023-06-29-121654.jpg

It just seems like too much.


1 comment
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Related Resources

Additional resources still need to be added for this topic