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 _______________________________________________ List sponsored by Home Power magazine RE-wrenches@lists.re-wrenches.org http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
