Shark meters are ideal for getting the energy readings for loads, generation and even mixed systems that generate part of the time and act like a load part of the time. A good example of the latter is a wind farm. When the wind is not blowing or the propeller is stopped, the wind generator will actually use energy to keep its transmission warm on cold days. Depending on how you have the meter configured and how you orient the CTs you will see energy accumulating in the RCD (Received) or DEL (Delivered) registers. For systems that have both, one value will show up as negative watt hours.
The NET register is the sum of the two values in the RCD and DEL windows. The TOT register is the absolute value of the RCD and DEL registers added together. So, at the end of the month for our wind farm we might see +WH in the RCD window representing the energy that was generated and sent to the grid. We would see – WH in the DEL window representing energy used by the wind generator. The NET would be the sum of the two and this would be the energy that the power company would need to pay the wind farm for. The TOT would be the sum of WH in the DEL and RCD registers representing the total energy in the period.