That sounds like a good use for fuel cells -- light-weight, long-life
portability.

Normally, fuel cells are not feasible. Energy-wise, it takes 4-10 times as much
energy to make hydrogen than the resulting hydrogen provides.

Because it also takes 4-10 times as much energy to make methanol (and ethonol)
than the resulting methanol provides, the energy efficiency in the above fuel
cell is way down in the negative range.

Bill, K5BY