So you'd need 16 of those 220ah 6V batteries to provide 5 days of back-up, at the discharge rate of 2000 watts per day, in a 24V system. We offer several sizes and types of batteries to best suit your system needs. Most of the batteries we offer are the lead-acid type. They do require proper maintenance to extend their life and work in an optimum fashion. During this process, the battery caps are removed and distilled water is added as necessary.
Some manufacturers suggest their batteries be equalized monthly.
We offer several types of 6V batteries and 2V industrial cells. These folks do not plan to add solar to their system. Generators use a gas internal combustion engine to convert fuel to AC electricity, which can power large AC loads while batteries are being charged. In fact, many utilize a generator with batteries and inverter in the construction phase, then add solar incrementally as can be afforded. But, while you're running a generator to power these loads, you can also be charging a battery bank.