The tiny house is solar powered but there was still an open question as to whether all electric loads (there is no gas) could be powered with sufficient up-time with solar and a battery. The solar layout is limited by roof size, and while an external array could be built, the roof area is only currently planned place for solar. The question then becomes, how big does the battery need to be to absorb the transient demand loads - as solar peaks at midday but generally demand peaks between 4 PM and 9 PM.
The attached presentation overviews the whole-house electrical model and presents a methodology for determining how big the battery should be. This model was assembled and run over the course of 2022-2024.