Cabin Solar - How To -

[Skvez]

I didn't mention "losses".

The OP tried to size their system properly, they worked out what their desired load was and worked backwards to see how big the solar panel and battery needed to be.
Unfortunately they made a number of errors and incorrect assumptions in that calculation which resulted in them believing that a 70W solar panel would suffice when in fact is was woefully undersized for what they needed.

A 70W solar panel feeding a battery is a great first solar system (And all preppers should seriously consider something similar) but expecting to run 15W of LED lights for 4 hours a day (in winter) is not realistic.

Sure there are other ways to charge the battery but the OP believed (and was sharing the belief) that a single 70W panel could do this.

To take your cooking chip analogy, if someone posted that they could cook a meal of chips on a single match (and it wasn't self evident that they'd made a miscalculation somewhere) would you leave the post uncorrected?
When it comes to solar people can't see that a "match-sized" solar panel can't cook a "meal of LED lights".