Solar Charger Shield charging and discharging same time

I would like to ask regarding the Solar Charger Shield V2.2, is it possible provide power to Arduino nano through Solar panel and charge batteries at the same time?

I want to keep the arduino nano ON during day time and charge batteries for night time

Theoretically, yes, it depends on how big a solar panel you choose.

I got 2 solar panels will be connected series to get 6V. Do you think it will work?