Can you confirm how the BOUGHT / SOLD integrator for Wp works? (watt hours)

The data has the same data update interval and integration interval. WP--SigA adds only when the value of active power WP-SigA for each data update is negative. Active power P-SigA is equal to P-E1 + P-E2, not equal to (WP+-E1) + (WP+-E2). Also, P-SigA is not always positive. It may be negative depending on the values of P-E1 and P-E2. WP-SigA increases when P-SigA is positive and decreases when P-SigA is negative. WP+-SigA increases when P-E1 or P-E2 is positive and is constant when both are negative. WP--SigA decreases when P-E1 or P-E2 is negative, and is constant when both are positive. When the signs of P-E1 and P-E2 are different, the absolute values of WP+-SigA and WP--SigA both increase.