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Devices connected to AC-out-2 will be immediately disconnected when the MultiPlus-II switches to battery operation.
This is designed for non-essential loads that should only operate when external AC power is available, such as an electric boiler or air conditioner.
Once AC power is restored to AC-in-1, the MultiPlus-II will reconnect the load to AC-out-2 after a delay of approximately 2 minutes, allowing for stabilization of a genset if one is being used.
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The AC-out-2 terminal on your MultiPlus-II 230V serves a very specific purpose and behaves in a particular way during power transitions:
Purpose of AC-out-2 Terminal: This terminal is intended for devices that should not operate without external AC power. It’s perfect for non-essential loads or those that consume a lot of power, like electric boilers or air conditioners—appliances you don’t want to drain your battery if the shore power fails or is disconnected.
Behavior During Power Switch to Battery: When the MultiPlus-II transitions from external AC power to battery operation, any devices connected to the AC-out-2 terminal will be immediately disconnected. This is an automatic response to protect your battery reserve by shedding loads that are not critical.
Reconnection Delay: Once external AC power is available again at the AC-in-1 terminal, the MultiPlus-II doesn’t reconnect the load to AC-out-2 instantaneously. Instead, there’s a programmed delay of about 2 minutes before reconnection. This delay serves a dual purpose:
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It allows for any connected generator (genset) to reach a stable output after starting up. Generators often need a short period to stabilize their voltage and frequency before they can reliably supply power to sensitive loads.
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It ensures that the external power source is stable and not just a brief return of power that could cause further disruptions if it were to fail again immediately.
System Protection and Efficiency: This feature of the MultiPlus-II protects the system from unnecessary power drains and potential damage from unstable power sources. It also helps maintain the efficiency of your power management by ensuring that only essential loads draw on the battery reserve during an outage.
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I was interested in this topic, as I wanted to use the OUT AC2 to do a load dump, depending on battery SOC.
I wanted to turn on OUT AC2 at 98% SOC, then turn it off the OUT AC2 at 70%
After reading the manual and reading these replies, I thought that this was not possible.
I then saw a Utube video that described how you could use OUT AC2 without AC IN.
Utube Link: https://youtu.be/nhuA3X9B6mg?si=p4fzUKSDGGnT18TJ
The Victron inverter is programmed using the VE configurator and using the programmable relay with two contact assistants.
So it would appear that using OUT AC2 using a the battery is possible.
I would be interested in any comments, and if anyone is using this method
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