Am I asking to much from 2x T105's?
I posted a month or so ago about my new solar install, and some issues I was having with the low voltage alarm on my Xantrek 2000W Prowatt while running my coffee maker (Tassimo). I was able to check...
Forum Discussion
I find that two 6s can run 100a inverter loads down to about 75% SOC (12.4v say) and you need four 6s to be able to do it at 50% SOC. YMMV--there are several variables, but others here have reported something similar.
In my experience, the voltage drop for a 100a load depends on the AH capacity of your battery bank the inverter is on. Higher capacity, less drop.
Once that initial drop occurs, then the battery voltage tapers slowly while the load is running.
So if the initial drop is say 1v, and it will drop another half volt during the run time, you need to start at above 12.5v on that bank to stay above 11v inverter alarm.
The capacity of the bank gets smaller in cold weather and also as state of charge is reduced, so if you are near the edge in summer it might not work in winter.
If your two T-105s are not able to do it at 75% SOC or above:
-they may be sulfated to have less capacity than normal for their SOC
-your inverter-battery wiring is fat enough but there may be a connection issue negating that fat wire advantage.
In my experience, the voltage drop for a 100a load depends on the AH capacity of your battery bank the inverter is on. Higher capacity, less drop.
Once that initial drop occurs, then the battery voltage tapers slowly while the load is running.
So if the initial drop is say 1v, and it will drop another half volt during the run time, you need to start at above 12.5v on that bank to stay above 11v inverter alarm.
The capacity of the bank gets smaller in cold weather and also as state of charge is reduced, so if you are near the edge in summer it might not work in winter.
If your two T-105s are not able to do it at 75% SOC or above:
-they may be sulfated to have less capacity than normal for their SOC
-your inverter-battery wiring is fat enough but there may be a connection issue negating that fat wire advantage.
