Understanding ripple voltage?

[Kirkinsb]

To calculate ripple from the Castle Data Log Viewer...I took Max voltage 33.5 volts divided by Max ripple of 2.53 volts. That gave me a ripple of about 7.5% based on 33.5volts or 6.3% based on 34 volts. Is this correct to us Max volt numbers? Also I noticed the peak ripple is for only for an instant...So am I ok on ripple? Do I use 33.5 or 34 as the max...or does that matter so much? I am either 6.3% or 7.5%