1. The onboard generator charges the lithium battery. If it is a lead acid battery, the charging current is currently designed based on 15% of the capacity. For example, for an 80ah battery, the charging current is 80ah. about 12a, so 1.5 square meters of copper is enough.
2. If it is lithium battery charging current, the current design is based on 0.3C and a maximum of 0.4C. If the charging current is also 80 Ah, it will be around 32 A.