What you will see
- Backup cuts out when an AC, motor or pump starts
- Backup stays off for about an hour after repeated cuts
- EPS Volt Low on the screen
Why it happens
Motors draw a big surge when starting. Added to everything else on backup, it exceeds the EPS rating.
Error 507 also appears if loads exceed what the lithium battery can deliver.
Diagram
Starting surge tips backup over
Lights, fansAC or pump startsRunning
After three overload warnings, Growatt locks off-grid backup for one hour.
What you can check yourself
- Note which appliance started when backup dropped
- Switch off heavy loads in load-shedding
- See our load division article
What not to do
- Do not keep restarting the same heavy load
- Do not connect grid wiring to the EPS port
When to call us
- Review circuits on the backup board
- Divide loads or size up the system
Summer load-shedding
ACs running through load-shedding cause most backup overloads in Faisalabad and Lahore. We plan backup circuits so they stay on.
Send us
a list of appliances on backup and the alarm