Numeracy

Hydrogen is 0.082 kg/cu m.
Spicer generator batch - 0.3 kg/day production.
Honda generator - 0.55 gal tank. 0.3 kg is about 0.3 gal fuel, so half a tank.
Honda generator - runs 6.8 hrs at 225W output! [1]. Thus, we have storage enough for 3.4 hours of 225W. That is about good for night power. 2x this is plenty, outside of space heating and cooking.
Spicer generator can be built for $1k. Balance of system may be $1k. Tank is $1k. + Honda Generator clone at about $500.
Overall cost of $3.5k for 765 Whr.
Compare to Compressed Air, 100Whr per $300 tank with cheapo air engine - need $2400 in tanks for compressed air, unless use regular compressor for 100 psi, + Air engine. Propane Tank

Current

1000ml/min - 1l/min - 60 l/hr - $2500 [2]. If production price is $2500, we should be able to opensource this for DIY at 1/2 the cost at worst, 50% savings from labor. But likely, we can go down to $500 for materials at $1/lb + $10/lb for exotic materials.

In Iowa - http://www.hydrogenwindinc.com/
See Solar Hydrogen Chronicles for more info
- Production rate - 1000W for 170 l/hr of hydrogen. Matches above electrolyzer pretty much exactly.
- 170*24=4080 l/day. 4 cubic meters per day. Volume of 1000 gal propane tank is 3.8 cu m. This fills one propane tank in one day!