[RE-wrenches] MX60 output trips with load

[Matt Tritt]

Phil,

Have you clamped this circuit to see what the actual amps are?

Matt T

Phil Schneider wrote:

>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.
>
>The MX60 circuit with the problem has 16 Mitsubishi 170s (on a dual axis
>tracker) and a 60A DC breaker between the MX and the DC positive bus.  When
>operating, the MX generally shows less than 50A on the battery side in peak
>charging conditions.
>
>The owner is charging a RAV4 EV on a 240VAC, 50A circuit.  The MX output
>breaker in question trips when this load is turned on.  This happens
>regardless of battery SOC - even when MXs are in float.  Limiting the MX to
>45A output did not work either.  The other MX also has 16 Mitsu 170s, but
>they are fixed and do not have this problem.
>
>The breakers have been switched out (with equivalent 60A breakers) with no
>effect.  All terminations on the DC side have been checked.  MX #6 wiring is
>being upgraded to #4 right now, with 70A breakers.
>
>Outback was stumped.  Any other ideas out there?  Thanks...
>
>P.
>
>Phil Schneider
>Creative Energies
>
>
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