19 K1 ✓ K2 ✓ K3 ✘ 3 K1 ✓ K2 ✓ K3 ✘ 9 K1 ✓ K2 ✘ K3 ✘ 1 K1 ✓ K2 ✘ K3 ✘ 13 K1 ✓ K2 ✘ K3 ✓ 29 K1 ✓ K2 ✘ K3 ✓ 23 K1 ✓ K2 ✓ K3 ✓ 5 K1 ✓ K2 ✘ K3 ✓ 7 K1 ✓ K2 ✓ K3 ✓ 11 K1 ✓ K2 ✓ K3 ✘ 15 K1 ✓ K2 ✓ K3 ✓ 21 K1 ✓ K2 ✘ K3 ✓ 17 K1 ✓ K2 ✘ K3 ✘ 25 K1 ✓ K2 ✘ K3 ✘ 27 K1 ✓ K2 ✓ K3 ✘ 31 K1 ✓ K2 ✓ K3 ✓ turn off Inverters switch to grid tie K3's open close K2 turn on Inverters K3's close open K2 open K2 turn on Inverters close K2 turn off inverter turn off inverters turn off inverters turn off inverters turn off inverters