They also sell 1kW propane/air fuel cells which they sell by the thousand in rural Japan - they produce 500W of electricity
Only 500 W? That does not seem like enough for a rural user. From what I have seen in rural Japan they need kilowatts during a power failure to get anything done. 500 W is what you get from portable generator with a handle, used at the beach by obnoxious people to power boom boxes. Here is an 800 W one:
Here is a 4.2 kW CHP fuel cell from Miura and Cares for the "commercial building sector." Not enough for that sector. Something does not add up. This says it is their first offering: