From the details given, and view of the home...
It wasn't attached to solar.
It was comparable to leaving the battery of one of your tools on a charger unattended for a long period of time. Especially one of the older versions.
A deep draw or over charge on the older versions could create the runaway thermal condition. The new ones go into sleep mode if draw down is below roughly 20% of capacity. The new chargers also have a chip that keeps them from charge much more beyond 80% capacity.
The safety mechanisms, like any, can degrade over time... and it is hard to determine from the article how long this unit was in use, its age, and what safety mechanisms were present.
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