You can use 80Ah to 150Ah any type of battery. Above 150Ah battery it’s may be come charging problem and inverter may be heat and before start charging inverter you must select inverter charging current.
Luminous brand is good for Inverter, Battery, Fan, Light and other electronic applications. Luminous is India’s no1 brand in Inverter and Battery, but luminous also manufacture other electronic appliances.
This mode can be use in case computer having in-built voltage regulation mechanism or externally connected automatic voltage regulator to take of wide waveform.
When select Eco Mode it wide input voltage fluctuation of 100VAC to 285VAC. Eco Mode also know Unregulated Mode.
This mode while computer has to be run as this will ensure regulated voltage input of 180V to 260VAC which is suitable for most of the computers .
If the input voltage goes beyond this limit , UPS will run on battery and will restore its operation in mains mode on restoration of normal mains ( between 180V to 260VAC).