I have an inverter connected to the garage where i  have 4 battery (2x12v-150a=24v+2x12v-150a =24v ) in parallel, i have the 3.2kwh 24v model. Al the cablage seem correct , battery charge from utility is 60A and cut off settings is 22v ... something strange i try the capacity of my battery pack (7200kwh 50% of use=3.6kwh) the load is 600wh....Theoretical 6h of usage in battery mode... But after 45min all go to shutdown... Is somehing wrong in my settings or i have to check my battery? (battery are new)

2 hours ago, allanon said:

I have an inverter connected to the garage where i  have 4 battery (2x12v-150a=24v+2x12v-150a =24v ) in parallel, i have the 3.2kwh 24v model. Al the cablage seem correct , battery charge from utility is 60A and cut off settings is 22v ... something strange i try the capacity of my battery pack (7200kwh 50% of use=3.6kwh) the load is 600wh....Theoretical 6h of usage in battery mode... But after 45min all go to shutdown... Is somehing wrong in my settings or i have to check my battery? (battery are new)

I will take a wild guess based on your 22V cut out that your batteries are no longer storing 150Ah each. AGM is good for 3.6kWh from 4 batteries when new. 

To get more than 1 year life cycle one should perhaps not draw more than 2kW on a regular basis like during the whole LS period. Further due to LS you have perhaps not charged them fully before the next LS cycle as AGM needs more than 12-18hrs to fully charge. This even if a low load is placed on them. 

Many variables and not enough information provided. 

22v cutoff is a bit low 23 to 23.5 is safer cutoff .

You have not mentioned the bulk and float charge .