Single Point Monitor Comparisons
A single point monitor simply measures power at one location. This is typically where the primary feeders from the utility meter enter the main circuit breaker panel. They differ from energy meter readers because they gather data from independent measurements rather than simply reread what the utility meter has recorded.
Single point monitors offer the lowest cost option amongst whole house energy monitors. This is generally OK if one simply wants to sub-meter an apartment or have a summary of total energy use. However, these monitors have limited capability when it comes to quantifying the amount of energy used by a specific appliance or circuit.
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| Model | TED 1000 | Cent-A-Meter | Efergy E2 | Owl CM119 |
| Manufacturer or Distributor | Energy, Inc. | Centameter | Efergy Tech. Ltd. | 2 Save Energy Ltd. |
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Channels Main: 240 V (2-pole) Aux: 120 V (1-pole) |
1001: 1 Main 1002: 2 Mains |
1 Main | 1 Main | 1 Main |
| Single Phase | Yes | Yes | Yes | Yes |
| Three Phase | No | No | No | Yes w/add. CT |
| Voltage Range | 85-140 V Line | 110-250 V Selectable | Preset 110-400 V (Voltage not Measured) |
Preset 110-250 V (Voltage not Measured) |
| Current Range of CT's | 0-400 Amps (100 A/CT Max.) |
0-71 Amps | 0-200 Amps | 0-71 Amps |
| Accuracy | +/- 2% | +/- 5% >3 A. +/- 10% 1-3 A. |
+/- 10% | +/- 5% >3 A. +/- 10% 1-3 A. |
| Resolution | 10 watts | n/a | n/a | n/a |
| Web Server Location | No Web Server | No Web Server | No Web Server | No Web Server |
| Communicaton to Display | Power Line Carrier | Wireless 433 Mhz |
Wireless 433.52 Mhz |
Wireless 433 Mhz |
| Communication to Computer | USB | None | USB for Data Export only | None |
| Analysis Software | Footprints (optional) |
None | Data Download and Graphing | None |
| Data Logging Capacity | Up to 13 Months | None | 64K Internal | Day/Wk./Mo. Qtr./Year Accumulation |
| Energy Cost Displayed | Yes | Yes | Yes | Yes |
| Power Source | Line Voltage to MTU, 120 V Adapter to Display | Trans: 3 x AA Recv: 3 x AA or 6 V DC Adapter |
Battery: 3 x AA |
3 x AA Sender 3 x AA Display or 6 V DC Adapter |
| Operating System Compatibility | PC, Mac, Linux | n/a | PC | n/a |
| Size (HxWxD") | n/a | Transmitter: 4.5x3.1x1.6" Receiver: 4.7x4.3x1.2" |
3.4x3.4x1.0" | Sender 4.5x3.1x1.6" Display 4.6x4.2x1.2 |
| Weight | <1 lb | Transmitter: 6.9 oz Receiver; 10 oz |
<1 lb | Sender 3.9 oz Display 5.8 oz |
| Documentation | UserManual | Manual | User Manual | User Guide |
| Special Features |
TED the Toolbar FREE Download Monitors Live Data on FireFox Toolbar |
Low Cost Monitor | Low Cost Monitor | 3-phase for Europe and TOU Rates |
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Visit our Energy Monitor Store For Additional Selection |
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If you have developed a single-point monitor system or know of one that is commercially available in the U.S. and not listed on this page, please contact us if you would like to have it evaluated for inclusion on this site.
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