diff --git a/goodwe_controller/test_maint14.py b/goodwe_controller/test_maint14.py
index 7a6873e..8296610 100644
--- a/goodwe_controller/test_maint14.py
+++ b/goodwe_controller/test_maint14.py
@@ -262,6 +262,13 @@ _, _, out, ev = run(m, T0, CHARGE_TIMEOUT_MIN + 10, None)
 fail = [e for e in ev if "ABORT" in e]
 check("charge-time limit: the reason gives the hours of charging time",
       len(fail) == 1 and "36 h of charging time" in fail[0])
+m = in_charge()
+run(m, T0, 10, 98.0)
+_, _, out, _ = run(m, T0 + 10 * MIN, CHARGE_TIMEOUT_MIN + 20, None)
+_, _, _, ev = run(m, out[1] + MIN, 30, None)
+check("charge done with no SoC, then HOLD with no SoC: a new episode, so the "
+      "HOLD line is said", out[0].phase == HOLD
+      and sum("hold waits" in e for e in ev) == 1)
 
 print("6. restart while the SoC is missing")
 with tempfile.TemporaryDirectory() as d:
@@ -307,19 +314,36 @@ with tempfile.TemporaryDirectory() as d:
     res, _, out, _ = run(mo, T0, 120, None)
     check("an old state file with no SoC seen: the charge fails at 36 h",
           out and out[0].failed == "charge")
+    # a MAINT-13 state file: charge_track with a best but no `last`
+    since = (T0 - timedelta(hours=35)).isoformat()
+    m13 = dict(old, phase_started=since, charge_track={
+        "since": since, "open_min": 2100.0, "flat_min": 0.0, "best": 99.0,
+        "at": (T0 - MIN).isoformat()})
+    path4 = os.path.join(d, "s4.json")
+    json.dump(m13, open(path4, "w"))
+    mo = Maintenance(CFG, Store(path4))
+    res, _, out, _ = run(mo, T0, 120, None)
+    check("a MAINT-13 state file (no last SoC): no crash, the charge fails at "
+          "36 h (best is not last)", out and out[0].failed == "charge")
 
 print("7. two packs")
 a, b = (Maintenance(CFG, Mem(), unit="inverter-a", name="inverter-a"),
         Maintenance(CFG, Mem(), unit="inverter-b", name="inverter-b"))
 a.force_start(T0)
-b_alone = Maintenance(CFG, Mem(), unit="inverter-b", name="inverter-b")
+# the twin site: the same two packs, A healthy (SoC 60, still above the floor)
+a_ok, b_alone = (Maintenance(CFG, Mem(), unit="inverter-a", name="inverter-a"),
+                 Maintenance(CFG, Mem(), unit="inverter-b", name="inverter-b"))
+a_ok.force_start(T0)
 same = True
 for i in range(0, 120, 10):
     t = T0 + i * MIN
     plan = arbitrate([a, b], t)
+    plan0 = arbitrate([a_ok, b_alone], t)
+    same = same and plan[1] == plan0[1]
     ra = a.tick(t, None, blocked_by=plan[0])
     rb = b.tick(t, 55.0, blocked_by=plan[1])
-    rb0 = b_alone.tick(t, 55.0, blocked_by=plan[1])
+    a_ok.tick(t, 60.0, blocked_by=plan0[0])
+    rb0 = b_alone.tick(t, 55.0, blocked_by=plan0[1])
     same = same and (rb.phase, rb.setpoint_w, rb.deferred) == \
         (rb0.phase, rb0.setpoint_w, rb0.deferred)
 check("A drains with no SoC at 0 W while B (SoC 55, idle) is as it is when A "