Just to revive this issue...
Just been trying my PV OptiSmart for an hour with the LED Sensor head unplugged.
The EnviR reads zero watts as expected but the meter count still goes up

Code:
Sensor=8, Time=18:21:01 Meter Reading=1537.194, Impulse Count=1608194, kwh=0
Sensor=8, Time=18:21:29 Meter Reading=1537.199, Impulse Count=1608199, kwh=0.005
Sensor=8, Time=18:21:56 Meter Reading=1537.204, Impulse Count=1608204, kwh=0.01
Sensor=8, Time=18:22:23 Meter Reading=1537.209, Impulse Count=1608209, kwh=0.015
Sensor=8, Time=18:22:51 Meter Reading=1537.214, Impulse Count=1608214, kwh=0.02
Sensor=8, Time=18:23:18 Meter Reading=1537.219, Impulse Count=1608219, kwh=0.025
Sensor=8, Time=18:23:46 Meter Reading=1537.224, Impulse Count=1608224, kwh=0.03
Sensor=8, Time=18:24:13 Meter Reading=1537.229, Impulse Count=1608229, kwh=0.035
Sensor=8, Time=18:24:41 Meter Reading=1537.234, Impulse Count=1608234, kwh=0.04
Sensor=8, Time=18:25:08 Meter Reading=1537.239, Impulse Count=1608239, kwh=0.045
Sensor=8, Time=18:25:35 Meter Reading=1537.244, Impulse Count=1608244, kwh=0.05
Sensor=8, Time=18:26:30 Meter Reading=1537.254, Impulse Count=1608254, kwh=0.06
Sensor=8, Time=18:26:58 Meter Reading=1537.259, Impulse Count=1608259, kwh=0.065
Sensor=8, Time=18:27:25 Meter Reading=1537.264, Impulse Count=1608264, kwh=0.07
Sensor=8, Time=18:27:53 Meter Reading=1537.269, Impulse Count=1608269, kwh=0.075
Sensor=8, Time=18:28:20 Meter Reading=1537.274, Impulse Count=1608274, kwh=0.08
Sensor=8, Time=18:28:47 Meter Reading=1537.279, Impulse Count=1608279, kwh=0.085
Sensor=8, Time=18:29:15 Meter Reading=1537.284, Impulse Count=1608284, kwh=0.09
Sensor=8, Time=18:29:42 Meter Reading=1537.289, Impulse Count=1608289, kwh=0.095
Sensor=8, Time=18:30:10 Meter Reading=1537.294, Impulse Count=1608294, kwh=0.1
Sensor=8, Time=18:30:37 Meter Reading=1537.299, Impulse Count=1608299, kwh=0.105
Sensor=8, Time=18:31:05 Meter Reading=1537.304, Impulse Count=1608304, kwh=0.11
Sensor=8, Time=18:31:32 Meter Reading=1537.309, Impulse Count=1608309, kwh=0.115
Sensor=8, Time=18:31:59 Meter Reading=1537.314, Impulse Count=1608314, kwh=0.12
Sensor=8, Time=18:32:27 Meter Reading=1537.319, Impulse Count=1608319, kwh=0.125
Sensor=8, Time=18:32:55 Meter Reading=1537.324, Impulse Count=1608324, kwh=0.13
Sensor=8, Time=18:33:22 Meter Reading=1537.329, Impulse Count=1608329, kwh=0.135
Sensor=8, Time=18:33:49 Meter Reading=1537.334, Impulse Count=1608334, kwh=0.14
Sensor=8, Time=18:34:17 Meter Reading=1537.339, Impulse Count=1608339, kwh=0.145
Sensor=8, Time=18:34:44 Meter Reading=1537.344, Impulse Count=1608344, kwh=0.15
Sensor=8, Time=18:35:12 Meter Reading=1537.349, Impulse Count=1608349, kwh=0.155
Sensor=8, Time=18:35:39 Meter Reading=1537.354, Impulse Count=1608354, kwh=0.16
Sensor=8, Time=18:36:07 Meter Reading=1537.359, Impulse Count=1608359, kwh=0.165
Sensor=8, Time=18:37:01 Meter Reading=1537.369, Impulse Count=1608369, kwh=0.175
Sensor=8, Time=18:37:29 Meter Reading=1537.374, Impulse Count=1608374, kwh=0.18
Sensor=8, Time=18:37:56 Meter Reading=1537.379, Impulse Count=1608379, kwh=0.185
Sensor=8, Time=18:38:24 Meter Reading=1537.384, Impulse Count=1608384, kwh=0.19
Sensor=8, Time=18:38:51 Meter Reading=1537.389, Impulse Count=1608389, kwh=0.195
Sensor=8, Time=18:39:19 Meter Reading=1537.394, Impulse Count=1608394, kwh=0.2
Sensor=8, Time=18:39:46 Meter Reading=1537.399, Impulse Count=1608399, kwh=0.205
Sensor=8, Time=18:40:14 Meter Reading=1537.404, Impulse Count=1608404, kwh=0.21
Sensor=8, Time=18:40:41 Meter Reading=1537.409, Impulse Count=1608409, kwh=0.215
Sensor=8, Time=18:41:09 Meter Reading=1537.414, Impulse Count=1608414, kwh=0.22
Sensor=8, Time=18:41:36 Meter Reading=1537.419, Impulse Count=1608419, kwh=0.225
Sensor=8, Time=18:42:03 Meter Reading=1537.424, Impulse Count=1608424, kwh=0.23
Sensor=8, Time=18:42:31 Meter Reading=1537.429, Impulse Count=1608429, kwh=0.235
Sensor=8, Time=18:42:58 Meter Reading=1537.434, Impulse Count=1608434, kwh=0.24
Sensor=8, Time=18:43:26 Meter Reading=1537.439, Impulse Count=1608439, kwh=0.245
Sensor=8, Time=18:43:53 Meter Reading=1537.444, Impulse Count=1608444, kwh=0.25
Sensor=8, Time=18:44:21 Meter Reading=1537.449, Impulse Count=1608449, kwh=0.255
Sensor=8, Time=18:44:48 Meter Reading=1537.454, Impulse Count=1608454, kwh=0.26
Sensor=8, Time=18:45:15 Meter Reading=1537.459, Impulse Count=1608459, kwh=0.265
Sensor=8, Time=18:45:43 Meter Reading=1537.464, Impulse Count=1608464, kwh=0.27
Sensor=8, Time=18:46:10 Meter Reading=1537.469, Impulse Count=1608469, kwh=0.275
Sensor=8, Time=18:46:38 Meter Reading=1537.474, Impulse Count=1608474, kwh=0.28
Sensor=8, Time=18:47:05 Meter Reading=1537.479, Impulse Count=1608479, kwh=0.285
Sensor=8, Time=18:47:33 Meter Reading=1537.484, Impulse Count=1608484, kwh=0.29
Sensor=8, Time=18:48:00 Meter Reading=1537.489, Impulse Count=1608489, kwh=0.295
Sensor=8, Time=18:48:27 Meter Reading=1537.494, Impulse Count=1608494, kwh=0.3
Sensor=8, Time=18:48:55 Meter Reading=1537.499, Impulse Count=1608499, kwh=0.305
Sensor=8, Time=18:49:22 Meter Reading=1537.504, Impulse Count=1608504, kwh=0.31
Sensor=8, Time=18:49:50 Meter Reading=1537.509, Impulse Count=1608509, kwh=0.315
Sensor=8, Time=18:50:17 Meter Reading=1537.514, Impulse Count=1608514, kwh=0.32
Sensor=8, Time=18:50:44 Meter Reading=1537.519, Impulse Count=1608519, kwh=0.325
Sensor=8, Time=18:51:12 Meter Reading=1537.524, Impulse Count=1608524, kwh=0.33
Sensor=8, Time=18:51:39 Meter Reading=1537.529, Impulse Count=1608529, kwh=0.335
Sensor=8, Time=18:52:07 Meter Reading=1537.534, Impulse Count=1608534, kwh=0.34
Sensor=8, Time=18:52:34 Meter Reading=1537.539, Impulse Count=1608539, kwh=0.345
Sensor=8, Time=18:53:01 Meter Reading=1537.544, Impulse Count=1608544, kwh=0.35
Sensor=8, Time=18:53:29 Meter Reading=1537.549, Impulse Count=1608549, kwh=0.355
Sensor=8, Time=18:53:56 Meter Reading=1537.554, Impulse Count=1608554, kwh=0.36
Sensor=8, Time=18:54:24 Meter Reading=1537.559, Impulse Count=1608559, kwh=0.365
Sensor=8, Time=18:54:51 Meter Reading=1537.564, Impulse Count=1608564, kwh=0.37
Sensor=8, Time=18:55:19 Meter Reading=1537.569, Impulse Count=1608569, kwh=0.375
Sensor=8, Time=18:55:46 Meter Reading=1537.574, Impulse Count=1608574, kwh=0.38
Sensor=8, Time=18:56:14 Meter Reading=1537.579, Impulse Count=1608579, kwh=0.385
Sensor=8, Time=18:57:08 Meter Reading=1537.589, Impulse Count=1608589, kwh=0.395
Sensor=8, Time=18:57:36 Meter Reading=1537.594, Impulse Count=1608594, kwh=0.4
Sensor=8, Time=18:58:03 Meter Reading=1537.599, Impulse Count=1608599, kwh=0.405
Sensor=8, Time=18:58:58 Meter Reading=1537.609, Impulse Count=1608609, kwh=0.415
Sensor=8, Time=18:59:25 Meter Reading=1537.614, Impulse Count=1608614, kwh=0.42
Sensor=8, Time=18:59:53 Meter Reading=1537.619, Impulse Count=1608619, kwh=0.425
Sensor=8, Time=19:00:20 Meter Reading=1537.624, Impulse Count=1608624, kwh=0.43
Sensor=8, Time=19:01:15 Meter Reading=1537.634, Impulse Count=1608634, kwh=0.44
Sensor=8, Time=19:01:42 Meter Reading=1537.639, Impulse Count=1608639, kwh=0.445
Sensor=8, Time=19:02:37 Meter Reading=1537.649, Impulse Count=1608649, kwh=0.455
Sensor=8, Time=19:03:05 Meter Reading=1537.654, Impulse Count=1608654, kwh=0.46
Sensor=8, Time=19:03:32 Meter Reading=1537.659, Impulse Count=1608659, kwh=0.465
Sensor=8, Time=19:03:59 Meter Reading=1537.664, Impulse Count=1608664, kwh=0.47
Sensor=8, Time=19:04:27 Meter Reading=1537.669, Impulse Count=1608669, kwh=0.475
Sensor=8, Time=19:04:54 Meter Reading=1537.674, Impulse Count=1608674, kwh=0.48
Sensor=8, Time=19:05:22 Meter Reading=1537.679, Impulse Count=1608679, kwh=0.485
Sensor=8, Time=19:05:49 Meter Reading=1537.684, Impulse Count=1608684, kwh=0.49
Sensor=8, Time=19:06:17 Meter Reading=1537.689, Impulse Count=1608689, kwh=0.495
Sensor=8, Time=19:06:44 Meter Reading=1537.694, Impulse Count=1608694, kwh=0.5
Sensor=8, Time=19:07:12 Meter Reading=1537.699, Impulse Count=1608699, kwh=0.505
Sensor=8, Time=19:07:39 Meter Reading=1537.704, Impulse Count=1608704, kwh=0.51
Sensor=8, Time=19:08:34 Meter Reading=1537.714, Impulse Count=1608714, kwh=0.52
Sensor=8, Time=19:09:01 Meter Reading=1537.719, Impulse Count=1608719, kwh=0.525
Sensor=8, Time=19:09:28 Meter Reading=1537.724, Impulse Count=1608724, kwh=0.53
Sensor=8, Time=19:09:56 Meter Reading=1537.729, Impulse Count=1608729, kwh=0.535
Sensor=8, Time=19:10:23 Meter Reading=1537.734, Impulse Count=1608734, kwh=0.54
Sensor=8, Time=19:10:50 Meter Reading=1537.739, Impulse Count=1608739, kwh=0.545
Sensor=8, Time=19:11:18 Meter Reading=1537.744, Impulse Count=1608744, kwh=0.55
Sensor=8, Time=19:13:07 Meter Reading=1537.764, Impulse Count=1608764, kwh=0.57
Sensor=8, Time=19:13:34 Meter Reading=1537.769, Impulse Count=1608769, kwh=0.575
Sensor=8, Time=19:14:02 Meter Reading=1537.774, Impulse Count=1608774, kwh=0.58
Sensor=8, Time=19:14:29 Meter Reading=Infinity, Impulse Count=1608779, kwh=Infinity
Sensor=8, Time=19:14:56 Meter Reading=1537.784, Impulse Count=1608784, kwh=0.59
Sensor=8, Time=19:15:24 Meter Reading=1537.789, Impulse Count=1608789, kwh=0.595
Sensor=8, Time=19:15:51 Meter Reading=1537.794, Impulse Count=1608794, kwh=0.6
Sensor=8, Time=19:16:18 Meter Reading=1537.799, Impulse Count=1608799, kwh=0.605
Sensor=8, Time=19:16:46 Meter Reading=1537.804, Impulse Count=1608804, kwh=0.61
Sensor=8, Time=19:17:13 Meter Reading=1537.809, Impulse Count=1608809, kwh=0.615
Sensor=8, Time=19:17:40 Meter Reading=1537.814, Impulse Count=1608814, kwh=0.62
Sensor=8, Time=19:18:08 Meter Reading=1537.819, Impulse Count=1608819, kwh=0.625
Sensor=8, Time=19:18:35 Meter Reading=1537.824, Impulse Count=1608824, kwh=0.63
Sensor=8, Time=19:19:02 Meter Reading=1537.829, Impulse Count=1608829, kwh=0.635
Sensor=8, Time=19:19:30 Meter Reading=1537.834, Impulse Count=1608834, kwh=0.64
Sensor=8, Time=19:19:57 Meter Reading=1537.839, Impulse Count=1608839, kwh=0.645
Sensor=8, Time=19:20:24 Meter Reading=1537.844, Impulse Count=1608844, kwh=0.65
Sensor=8, Time=19:20:52 Meter Reading=1537.849, Impulse Count=1608849, kwh=0.655
Sensor=8, Time=19:21:46 Meter Reading=1537.859, Impulse Count=1608859, kwh=0.665
Thus if you were using one to count water or gas you would use 665 of what ever the meter pulsed at e.g. CuFt in one hour.
BTW, my PV meter actually displays 209 kWh rather than the 1537 kWh the impulse count has incremented.
I shall now try the same test on my other OptiSmart.
Automan.