I have a backup power system consisting of a charger, a battery and an inverter. The inverter powers my load (a few mains appliances). Currently I am using a 12V 200 Ah battery which gives me a backup of say 2 hours for my load.
I am upgrading to an inverter that requires 24V, so I will need to use two batteries in series. To save on the cost of the batteries I am thinking of buying two smaller batteries so that it costs me the same as the larger battery I originally had.
My question is: If I use two 12V 100 Ah batteries in series, will I still have the same backup time (2 hours) for the same load?
I am confused about this because from what I remember connecting in series will only double the voltage and retain the rating at 100 Ah, however what is the benefit of 24V, should that not translate to the same backup time since at the end of the day the load consumes the same power?