Hello researchers,

I just observed a strange thing in the homer energy software's simulation results export file (.csv). For a certain hour (when solar wasn't operational), the PV power, grid import and grid sales power was 0, I had to meet a load demand of 210kW. I have two fuel cells in my designed system (250kW each) and I observe that both the fuel cells were operating. Although 210kW load demand was satisfied, the additional power output from fuel cells were being input to the electrolyzer to produce hydrogen again. I mean what's the point of fuel cell consuming hydrogen to input power to electrolyzer to produce hydrogen again. According to me, only one fuel cell should be in operation for this time stamp (one hour) and the excess should be either exported to grid or the fuel cell working capacity should be matched with the load demand.

Kindly see the highlighted cell in the attached pictures.

Also I see the stored hydrogen is sometimes negative? Has anyone else got the same problem?