Expect more or less 1 Ampere 50 Volts per magazine on a running system.
If batteries are connected, you're better to use in your formula the I max of the rectifier unit (normally written on the unit) : After a power failure, the power unit will deliver his max current to charge batteries.
Take into account an efficiency of +/- 80 % for rectifier unit.
VA=55V * 15 A (example) * .80 = +/- 650 VA max per lim
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