The "Do The Math" blog is always interesting - the latest provides efficiency figures on his DIY-solar set-up, with a comparison of "off-grid" to "on-grid" efficiency.
Blow-by-Blow PV System Efficiency: A Case Study for Storage | Do the Math:
The primary result is that I only get to use 62% of the energy delivered by my panels. The comparable number for a grid-tied system is something like 87–90% (inverter efficiency). My system suffers an additional 87% efficiency factor due to its full-tummy effect. This is close to the grid-tied inverter efficiency, so we can say that a panel in a small-scale off-grid system will likely deliver only something like 60–65% as much total energy as a grid-tied panel.Continue Reading at 'Do the Math':
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