@danesol if that output and some of the others on your pvoutput log are accurate then the Solar Immersion isn't doing a very good job of tracking your generation as it appears to swing wildly either side of the actual generation. If that is the case, your energy consumption for yesterday for example is very worrying.
Unless it is caused by the inaccurate monitoring systems. attached below are your charts for yesterday and today and my chart using an immersun with fall over load for today.
The bottom one is monitored using an eco-eye, mine are monitored using accurately calibrated CT's with AC voltage and phase monitoring also OpenEnergyMonitor.org
It may be just the monitoring, if that isn't accurate then unfortunately you don't really know how well it's performing.
Yours Yesterday:
View attachment 18999
Yours Today:
View attachment 19000
Mine Yesterday:
View attachment 19001
Mine Today (Water hot at 9:45 am) roll over to 750 Watt panel radiator:
View attachment 19003
And other one using an ImmerSun (Water hot at 11:30 am)
View attachment 19004
The spikes on mine - lots of cups of tea today