1) Do you have a link to the "new gen[eration] Rayovacs"? I wasn't sure what you were referring to here.
2) I assume that the numbers in the financial model refer to "per household" costs, rather than "per adult" costs, and changed them accordingly.
3) The assumption is that there will be a single lighting unit per household, correct?
4) I'm not sure about the "less than $20 per household" math. In particular, assuming that the fast-charge batteries and the (single) lighting unit remain $10 a piece, you'd still need another $5/household to pay for the panel, charger and pillar (assuming there were 100 households). Maybe the sentence could read, "A bare bones system would be around $25 per household."? I didn't change it, though, in case I'm missing something important.
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