Carl, If you envision a time when the gen could be on simultaneously with the SB, ie grid down & low SOC & high load, test those conditions. Depending on the generator brand and firmware, and also on the SI firmware, this test often gave the generator fits. -Phil Boutelle
On Monday, October 22, 2012, Carl Adams wrote: > Hello Wrenches, > > We have commissioned a new SI system (240V single phase residential) and > want to ensure testing is adequate to ensure the system will perform as > desired. > > The system consists of two SI5048s, 5kW PV array, SB5000US, battery bank, > transfer switch, backup generator, and supplemental digital relay to > activate DigIn signal on Grid DOWN condition. > > I am sure there are many test scenarios to run through to qualify the > system. Here is one. > Test Case 1 > > 1. Verify SOC is 95%+ > 2. Modify GnSocTm1Str and GnSocTm1Stp to artificially high numbers > (85% and 90% respectively) > 3. Power off SB5000US to eliminate charging from solar > 4. Simulate Grid Outage > 5. Verify Transfer switch moves to generator input position > 6. Verify DigIn signal to SI5048 reflects grid state (grid is down) > 7. Monitor SOC and verify that when SOC reaches GnSocTm1Str (85%) the > SI starts the generator > 8. Monitor SOC and verify that when SOC reaches GnSocTm1Stp (95%) the > SI stops the generator > 9. Power ON the SB5000US > 10. Reset GnSocTm1Str and GnSocTm1Stp to system specific values. > 11. End Test > > Another test would be to bring the grid back up after step 7 or after step > 8 and verify correct behavior. > > I would love to hear from those who have commissioned similar SI > configurations, about other scenarios we should be testing to adequately > qualify the system. > > Carl Adams > SunRock Solar > NABCEP Certified PV Installer >
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