Best Recharge Volt

My XW6048 and 2 MPPT60 are grid tie and also have a 522 Amps 48V battery backup. Which is the optimum ReCharge Volt number for an Enhance Grid Support operating mode?  The purpose is to maintain the battery bank as fully charge as possible to have support in power failure. Wright now I have the Recharge Volt in 51V in the Inverter XW6048 and MPPT60 parameters.
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