Pumping: Hydraulic losses

In the losses flow (as shown on the Loss diagram) of non-battery pumping systems, we have chosen to account for all electrical losses even when the pump is stopped for hydraulic reasons.

In this situation the ELowLev and ETkFull contributions are referred to the EPmpAv (Available useful energy at pump) energy.

An alternative way would be to refer the hydraulic ELowLev and ETkFull losses to the EArrMPP energy, and to consider the system as "not running" during these situations. In this case the hydraulic arrow losses would come upstream of the other losses, with increased "virtual" energy hydraulic losses referred to EArrMPP. The results are equivalent, the account of the effective hydraulic losses being transferred from the Array and Converter to the EArrMPP quantity.

NB: In Battery Buffered systems, the interpretation of the "Available energy at pump" is not well defined, so that we preferred the second alternative.