MX 60 for wind [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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Jeff Clearwater, Village Power Design wrote:
> But I remember a conversation with Chris F. at EO 
> a few years back where it seemed like the MX60 
> could be set up in a diversion mode.  I also 
> have 35 amps of PV to regulate too however.  I 
> could put the PVs on a MX60 and then the wind 
> would be covered 
 
The MX60 can be used to provide control of a diversion load - either AC 
or DC loads can controlled.  You need to add the diversion control 
device - either a normal relay or (preferably) a solid state relay.  The 
MX60 provides a 12vdc output signal to power the relay's coil - so you 
don't need anything other than a typical 12 vdc coil type relay even if 
the system is 24 or 48 vdc nominal.  

Solid state type relays can be switched much faster than mechanical 
relays - so the "smoothness" of the diversion control is better (i.e. 
the power is PWM'd). When using solid state relays you need to set the 
on/off time delays  in the MX60's diversion system setpoints to zero.  
Solid state relays can be ordered for either AC or DC loads and need to 
be mounted on a heatsink.  I usually suggest the Eurotherm / continental 
brand of solid state relays - 
http://www.ciicontrols.com/products/svdd.htm - which will handle up to 
100 vdc and 40 amps per device (you can have more than one controlled by 
a MX60 for larger systems).

The OutBack FX inverter can also provide a diversion output control 
signal (it also is a 12vdc signal).  It also has an AC diversion mode 
setting in which the diversion load is turned off if the inverter gets 
too hot or hits its overload limits.  This was suggested by Bob-O of 
Electron Connection as he was using the FX to dump hydro output to his 
electric water heater and had an issue when the well pump would start, 
causing the inverter to current limit and flicker the output 
momentarily.  With the new AC diversion mode,  the dump load would be 
turned off instantly when the motor started - eliminating the flicker.   
 

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  

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