How to wire a 240 volt water heater element from ac 2 output , I have two multiplus set up in split phase 180 degrees 240 volts , when measuring voltage from line 1 and line 2 of each inverters I get 240 volts , so can I just wire the hot L1 from ac output 2 and the hot L2 from ac2 second inverter and not connect anything to neutrals of either inverter ,I know this is how it’s done from the grid but with inverters , I have no experience and don’t want to damage something ,note the output from both hot L1,L2 (from ac out 2 , non critical loads )will go directly to the water heating element besides for circuit breaker in separate e panel .
Presumably, you already have the output neutrals of both of the Multipluses tied together to form split-phase.
Then yes, AC-Out-2 from both inverters can go straight to the water heater as a 240V load (L1 and L2). No neutral is needed for a purely 240V device. When inverting, the AC-Out-2s on both inverters will switch off. Ideally, the breaker for this dedicated circuit would be near the multiplus-es.
Yes both inverters are set in split phase 180 degrees apart and power from output 1(critical loads ) L1 and L2 go to a a.c. 100 amp 240 volt e breaker panel with both neutrals connected to neutral buss bar in panel , (what I want to do is wire my a.c. Out 2 )from inverter going to a different single 240 volt breaker( not in my main electrical panel that has two inputs(L1 from one inverter and L2 from second inverter 120 volt each and two outputs 120 volts each (no neutrals )then go directly to water heater element to provide 240 volts to element , this is the way the grid works no neutrals . Thanks for your input , like I said I know how it works from the grid but wasn’t sure about inverters , by using output 2 on the inverters I can program the a.c. Out2 to be powered when my batteries are 90% full or by voltage using the assistant in Victron program . I know the a.c. Out 2 becomes powered when the inverters have a grid power in. Thanks again
You didn’t specify which multiplus model you have, so make sure your multiplus AC-out-2s are rated for the current you expect to draw.
Yes, you can control AC out-2 switching based on many criteria using the Programmable Relay Assistant.
I’m not sure if it needs to be configured on both multiplus identically, but I suspect it does, check the documentation to be sure.
I have two multiplus 5000/48 volt inverters , and my load I’m powering is aprox 1500 watts at 240 volts , and I’m sure I need to program both inverters using the assistance , I’ve done this before to one inverter( before I got my second inverters wired and set up for 240 volt split phase ) output power of 120 volts and have it set up to turn on the relay at a certain voltage of my batteries 54.5 volts and to turn off the relay at 53.35 volts with a one minute delay for both settings , this works great for me and my energy critical loads . This works out to turning on my lower water heater lower element at aprox 90% soc , and keeping the element powered to a point that doesn’t discharge my batteries if solar panel output drops too low and also prevents excessive cycling . These settings will vary depending on individual’s system and energy usage etc . I have previous experience with this on a Midnite solar classic 150 charge controller (one of my previous systems.) That worked great for me for 13 years UPDATE AS OF FEB 18TH , WORKS ! wired the inverters just with L1 and L2 and grounds to a single 240volt breaker from a.c. Out 2 from both inverters and yes it works without neutral , just like from the grid
Thanks for your input 
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