What are the T1 and T3 rates shown on the EV meter? A What are the T1 and T3 rates shown on the EV meter? T1 is the counting register for the off-peak period on the meter, whilst T3 is that of the peak consumption. Lorraine Gravino2020-01-31T17:49:45+01:00 FacebookTwitterRedditLinkedInWhatsAppTelegramTumblrPinterestVkXingEmail