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
asked
Voltage drop
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.
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.
Then here is a comparison between inverter output:
It just seems like too much.
What batteries do you have?
What is their c rating?
When connected to grid there is no load on the battery, as it drops off then the load is on the battery. If even one is weak or they are not well charged you can have that effect.
What does the ve bus voltage show compared to the shunt voltage?
Are you sure that 52v is fully charged? Or is that meant to be float?
I would expect around 13.5v per battery so a 48v bank would be 54v float. I could be wrong though, what does the battery spec say?
How balanced are the batteries? How old are they?
