Is the wiring 120/240 and Series or Parallel stacking? If parallel, one of the 
stacking options assumes you have a x-240 transformer and the slave is silent 
unless power save is high enough. Pick the parallel that keeps both inverters 
on at the same time   This is kinda foggy since it has been a while. 

A video from the Mayan era. 

https://youtu.be/9k1afbsQrAA

The Mate3(s) is easier. 


Maverick Brown
Off-Grid Solar Commander since 2006
Maverick Solar Enterprises, Inc.
 • Solar Commander Remote Power
 • SunFlow Systems Cathodic Protection 
[email protected]
512-460-9825


> On Mar 20, 2022, at 9:15 AM, John Blittersdorf <[email protected]> 
> wrote:
> 
> Wrenches, I just added a 2nd VFX3648 stacked as SLAVE L1 to increase 
> charging of his new eVault 18.5 from 12kw Kohler gen. It connects to the 
> generator but doesn’t charge.  I read in the manual that both inverters must 
> be the same firmware revision.  Once hooked up I found that the added 
> inverter was rev #68 and the original one rev 61.  Would it be possible to 
> switch which inverter is the master and have the newer one recognize the 
> older one.? Otherwise is my only option to put a new control board in the 
> original inverter? And possibly also in the new one.  Anyone know what the 
> latest rev or last one was?
> 
> John Blittersdorf
> 
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