I discovered an error in the calculations of how much energy is generated by Dynamos icw. Furnaces.
The new rule for optimum energy availability is:
If you have 4 or less slots available, choose all furnaces.
If you have more than 4 slots available, choose 3 dynamos and the rest furnaces. (This changes the recommended configuration for when exactly 4 slots are available, for about 14% more energy)