Hi Nick! Thanks for reaching out for assistance. The solar power accessory should continue powering the SKY over several weeks with little solar input during overcast conditions.
It looks like your solar power accessory might be failing instead, it’s already stopped providing power to the SKY yesterday morning. Can you disconnect it when you get the chance and check the electrical contacts for corrosion and the possibility of water intrusion. The voltage is very low and it likely won’t power the SKY if you reattach it without trying to charge it some. We can get you a replacement if necessary.