google charts vAxis max Value

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Hi,

i use google chart in "Tasmota Software":

I would like to assign a maximum value to the Y-axis (vertical). Unfortunately it doesn't do that; as soon as a larger value comes, the axis increases.  What am I doing wrong?

; 4h power chart - new value every 30s
$<div id="chart1" style="text-align:center;width:400px"></div>
$gc(lt s4h "wr" "Leistung [W]" cstr2)
$var options = {
$chartArea:{left:60,width:'83%%'},
$legend:'none',
$vAxis:{format:'# W',minValue:0,maxValue:300},
$explorer:{actions:['dragToZoom', 'rightClickToReset']},
$series: {0: {type: 'area'}},              
$title:'Verbrauch 4 Stunden [Watt]'
$};
$gc(e)