Out of power during coldest months

What else needs to happen on top of freezing cold temperatures in the van?! Of course the power running out.. When it's super cloudy or even raining there is either 0 charge or round about 3 Watt coming in. Which in comparison we use about 30 Watt a night roughly. So within a week of no charge the power is going down very quickly.
Just after christmas 2022 it happend. Since we have AGM batteries we can only run them half down and not completely empty, therefore the 61% on the display.

Now an update as of 20th Jan. 23- the batteries have been fully charged again. We had some sunny days and it took around 3 weeks for them to be charged up again.
In the meantime we were able to roll out the cable from the house and charge phones, laptop and have a little lamp on that way. That was a big help since the batteries of the torches ran out super quick every day.

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