My arduino uno sends data from my energy meter (counting pulses) to emoncms every minute. Or to be more precise, when the next pulse occurs after 1 minute. The sum of kWh on emoncms is correct (daily use). But when I try to export it to CVS for further analasys, the sum is not correct anymore. I get the best results if I choose 10s interval, but the sum of kWh is stil a few percent off.