[RE-wrenches] MX60 output trips with load

[Todd Cory]

The MX60 current limits by misaligning the MPPT. I have mine set to 70 
amps with a 90 amp output breaker and on cold, winter, edge of cloud 
days I have seen the unit peak the output wattage as high as 4812 
watts/94 amps @ 51.2 volts before the software could throttle the unit 
back!

I'd try upping the output wire size and adding much larger breaker.

Todd



R. Walters wrote:

> Hi Phil;
>
> THe only thing I could think, is that your battery voltage would  
> drop, when the EV charger came on. If its a small battery bank this  
> could be a large enough drop to cause the MX 60 output to go over 60  
> amps long enough to trip the breaker. We had a similar problem,  
> everything fine most of the time, but with high enough array power,  
> and a low enough battery voltage, (Power / voltage = current)  You  
> are going to go over 60 amps. I figure at full array output, a  
> battery voltage of 45.3 will give you 60 amps. If your array outputs  
> more than rating (which we are seeing most of the time with  
> Solarworlds) then the problem gets worse.
> I think the problem is its a higher array output than rating, and a  
> very small battery. Also if the room is warm, that will move the trip  
> curve of the breaker as well.