Fix _m_to_cm: multiply by 100 to convert meters to cm

pvlib/iotools/era5.py

@@ -37,7 +37,7 @@ def _j_to_w(j):
 
 
 def _m_to_cm(m):
-    return m / 100
+    return m * 100
 
 
 UNITS = {

tests/iotools/test_era5.py

@@ -92,3 +92,7 @@
     match = 'Request timed out. Try increasing'
     with pytest.raises(requests.exceptions.Timeout, match=match):
         df, meta = pvlib.iotools.get_era5(**params, timeout=1)
+
+def test_m_to_cm():
+    from pvlib.iotools.era5 import _m_to_cm
+    assert _m_to_cm(0.01) == 1  # 0.01 m = 1 cm