remove error in tutorial-3

3d2cc2f6 · sp2668 · 2f3c4e03 · 3d2cc2f6 · 3d2cc2f6
Commit 3d2cc2f6 authored Jun 28, 2018 by sp2668
--- a/tutorial-3/.ipynb_checkpoints/solution03-checkpoint.ipynb
+++ b/tutorial-3/.ipynb_checkpoints/solution03-checkpoint.ipynb
--- a/tutorial-3/solution03.ipynb
+++ b/tutorial-3/solution03.ipynb
@@ -185,15 +185,20 @@
                bus + " Battery St.",
                bus=bus + " Battery",
                e_nom_extendable=True,
                capital_cost=0.2e6)
    network.add("Link",
-                bus + "<->Battery",
+                bus + "->Battery",
                bus0=bus, bus1=bus + " Battery",
                p_nom_extendable=True,
-                p_min_pu=-1,
-                capital_cost=0.3e6,
+                capital_cost=0.15e6,
+                efficiency=0.9)
+    network.add("Link",
+                "Battery->" + bus,
+                bus0=bus + " Battery", bus1=bus,
+                p_nom_extendable=True,
+                capital_cost=0.15e6,
                efficiency=0.9)
 ```

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