# AC Coupling causing clocks on appliances to speed up **URL:** \ **Category:** Q&A and troubleshooting\ **Tags:** professional, ess, quattro\ **Created:** [9 December 2024 20:37 UTC](https://community.victronenergy.com/t/ac-coupling-causing-clocks-on-appliances-to-speed-up/14827 "2024-12-09T20:37:46Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![DSeptembre](https://avatars.discourse-cdn.com/v4/letter/d/dbc845/32.png) [@DSeptembre](https://community.victronenergy.com/u/DSeptembre)\ **Post date:** [9 December 2024 20:44 UTC](https://community.victronenergy.com/t/ac-coupling-causing-clocks-on-appliances-to-speed-up/14827/2 "2024-12-09T20:44:00Z")
related post: > [@Frequency change of Multiplus2 output affects appliance](https://community.victronenergy.com/t/frequency-change-of-multiplus2-output-affects-appliance/10890): > > Since the weather has taken a turn for the worse I have broken out the freestanding oil fired heater. This is 10 months old. The unit works fine in normal operation. The problem is that when the batteries become fully charged the digital timer clock gains time really fast so by 6am it shows 8am (Having reset the clock the night before) I have checked and the multiplus increases the frequency of the output to regulate the fronius on the AC out. This is fine but the appliance must use the mai… --- _[View the full topic](https://community.victronenergy.com/t/ac-coupling-causing-clocks-on-appliances-to-speed-up/14827)._