inverter
To debug this you need to remove some variables. I would suggest connecting a simple resistor to the solar panel. Something like 18.1V / 5.52 Amps = 3.3 Ohms.
So the voltage may briefly dip below 10 volts for an instant, then spring back up to maybe 11.2 volts. Now if your inverter shuts down at say 10 volts, you might have very frequent shutdowns even with the battery at 11.5 volts. The battery internal resistance is also going to be higher at low states of charge, which makes all this a lot worse.
Batteries are dead or undercharged. The connection between the inverter and the battery is critical. Corroded terminals or loose connections can affect its power supply. If the connections look normal, the battery voltage may be too low.
Induction motors (e.g., air conditioners) require 3-7 times their rated power at startup, and if the inverter lacks sufficient surge capacity, the protection circuit may trip. Solution: Use a clamp meter to measure the peak inrush current.
An inverter displaying a low or no battery warning usually means that the energy storage system is unable to provide enough energy to the load. The problem may be related to the condition of the battery itself, a faulty charging system, or abnormal environmental conditions.
PDF includes complete article with source references for printing and offline reading.
Download detailed specifications for our distributed PV energy storage systems and liquid cooled ESS containers.
Calle de la Energía 24
Madrid 28045, Spain
+34 911 224 722
Monday - Friday: 8:00 AM - 7:00 PM CET