Good morning, I need to buy a hybrid inverter. I'm missing some information. I would have identified the model:

Victron MultiPlus-II GX 48V/5000VA/70A-50/230V

which if I'm not mistaken allows the back up function in the event of a power cut. The storage I purchased is made up of a series of 16 Eve FL105 cells with BMS Daily Home Appliance 150 amps, overestimated compared to the 105Ah cells. my doubt is firstly inherent to the 16s, I don't know if it is correct, in the sense that by reading the characteristics of the 48v inverter it would correspond to a 15s. as a second doubt, I would like to understand if the size of my photovoltaic system is correct. I currently have an installed power of 5kw, while the storage is 15kw. Could the 5000 model be adequate? thanks for the support.