If the FASTag is already linked with your bank account, then there is no need to load money separately in a prepaid wallet. You only need to ensure that your FASTag-linked bank account has sufficient balance to allow for toll payments.
However, if you have linked the FASTag to a prepaid wallet (NHAI prepaid wallet), then it can be recharged through various channels such as payment through cheque or through UPI/debit card/ credit card/ NEFT/ Net Banking. Also, additional charges will be levied while recharging the FASTag account through different channels.
Moreover, there is a cap on the maximum balance which can be kept in the prepaid wallet. As per regulations, these limits are:
For limited KYC FASTag account holder: This type of FASTag cannot have more than Rs 20,000 in their FASTag prepaid wallet. The monthly reload limit is also capped at Rs 20000.
For full KYC FASTag account holder: This type of FASTag account cannot have more than Rs 1 lakh in their FASTag prepaid wallet. There is no monthly reload cap in this account, according to the Indian Highways Management Company Limited (IHMCL) website.
Points to note
You cannot use one FASTag with two or more vehicles, you will have to buy two separate FASTags for the two vehicles and so on.