[RE-wrenches] MX60 output trips with load

[R. Walters]

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.

> Wrenches,
>
> We have an off-grid system (quad OB 3648s, two MX60s) with an MX60  
> output
> breaker that is tripping unexpectedly, and haven't been able to  
> troubleshoot
> the problem.
>
>
>
> Outback was stumped.  Any other ideas out there?  Thanks...
>
> P.
>
> Phil Schneider
> Creative Energies
>
>