Watt Meter
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 Digital 60V 100A Balance Voltage Power Analyzer Watt Meter Balancer RC Charger $19.99 Time Remaining: 21d 15h 30m Buy It Now for only: $19.99 |
 RC Electronic Watts Up Watt Meter Battery Monitor Onyx $47.99 Time Remaining: 5d 4h 41m |
 Digital 60V 100A Balance Voltage Power Analyzer Watt Meter Balancer RC Charger $19.99 Time Remaining: 15d 6h 7m Buy It Now for only: $19.99 |
 Turnigy 130 amp Watt Meter Power Analyser Nice $44.95 Time Remaining: 13d 12h 33m Buy It Now for only: $44.95 |
 A680 New Digital 60V 100A Battery Balance Voltage Power Analyzer Watt Meter $15.99 Time Remaining: 17d 1h 53m Buy It Now for only: $15.99 |
 R C Hobby WM 010 High Precision RC Model Battery Watt Meter SKYRC BK210 $25.90 Time Remaining: 14d 16h 45m Buy It Now for only: $25.90 |
 GTPower Watt Meter and Power Analyzer 130A $35.80 Time Remaining: 13d 15h 6m Buy It Now for only: $35.80 |
 100A Battery Balance Voltage Power Analyzer Watt Meter RC model $25.88 Time Remaining: 16d 1h 35m Buy It Now for only: $25.88 |
 GTPower 130A LCD RC precesion walt Watt Meter Power Analyzer $35.68 Time Remaining: 16d 48m Buy It Now for only: $35.68 |
 Multi function Wattmeter FD WM $18.26 Time Remaining: 16d 18h 36m Buy It Now for only: $18.26 |
 60V 100A Battery Balance Voltage Power Analyzer Watt Meter RC model $19.99 Time Remaining: 21d 4h Buy It Now for only: $19.99 |
 ElectriFly PowerMatch Power Meter Lipo Battery Balancer Watt Meter $37.99 Time Remaining: 13d 11h Buy It Now for only: $37.99 |
 LCD RC 130A Watt Meter Power Analyzer Ver2 GT Power FREE SHIPPING $34.99 Time Remaining: 25d 3h 52m Buy It Now for only: $34.99 |
 Multi function Wattmeter FD WM $18.93 Time Remaining: 18d 15h 2m Buy It Now for only: $18.93 |
 GT High Precision Watt Meter and Power Analyzer AC048 $34.90 Time Remaining: 3d 22h 33m Buy It Now for only: $34.90 |
 RC Electronics Watts Up Watt Meter Blue Watt $47.95 Time Remaining: 25d 4h 34m Buy It Now for only: $47.95 |
 GT Power RC Watt Meter and Power Analyzer 130 Amps $39.95 Time Remaining: 28d 17h 18m Buy It Now for only: $39.95 |
 SKYRC RC Model WM 010 High Precision Battery Watt Meter $27.69 Time Remaining: 28d 5h 54m Buy It Now for only: $27.69 |
 NEW RC Electronics V2 Watts Up Watt Meter Blue WU100 B V2 $49.95 Time Remaining: 23d 12h 7m Buy It Now for only: $49.95 |
 Original SKYRC Genuine AMP High Precision RC Multi function Battery Watt Meter $25.90 Time Remaining: 17d 18h 51m Buy It Now for only: $25.90 |
 Turnigy watt meter $25.00 Time Remaining: 4d 10h 25m Buy It Now for only: $25.00 |
 New RC Timer Battery Balancer Watt and Voltage Meter $28.99 Time Remaining: 11d 17h 16m Buy It Now for only: $28.99 |
 MYSTERY RC Balance Voltage Power Analyzer and Watt Meter $19.99 Time Remaining: 16d 14h 8m Buy It Now for only: $19.99 |
 100A Battery Balance Voltage Power Analyzer RC Watt Meter LCD New $25.58 Time Remaining: 2d 6h 16m Buy It Now for only: $25.58 |
 New RC Timer Battery Balancer Watt and Voltage Meter $28.99 Time Remaining: 1d 8h 4m Buy It Now for only: $28.99 |
 GT POWER DC Watt Meter 130A Max for EDF Aircraft Heli $32.98 Time Remaining: 26d 7h 33m Buy It Now for only: $32.98 |
 SKYRC eXTREME Power Analyzer Watt Meter Li Po Battery Checker Equalizer BK213 $33.90 Time Remaining: 14d 18h 35m Buy It Now for only: $33.90 |
 AEO Model P0 High Voltage and Precision Wattmeter AC072 $20.90 Time Remaining: 24d 20h 38m Buy It Now for only: $20.90 |
 SKYRC i Meter Battery Watt Servo Temp Optical 7in1 RC Multimeter BK208 $53.90 Time Remaining: 14d 18h 35m Buy It Now for only: $53.90 |
 GTPOWER RC 01 to 100A lipo battery Voltage Watt Meter $25.88 Time Remaining: 16d 1h 43m Buy It Now for only: $25.88 |
 SKYRC i Meter Battery Watt Servo Temp Optical 7in1 RC Multimeter BK208 $53.90 Time Remaining: 8d 16h 27m Buy It Now for only: $53.90 |
 AEO Model P0 High Voltage and Precision Wattmeter BK152 $20.90 Time Remaining: 10d 11h 30m Buy It Now for only: $20.90 |
 DC Watt Meter 130A for EDF Aircraft Heli by GT POWER $34.00 Time Remaining: 13d 1h 54m Buy It Now for only: $34.00 |
 Deluxe Onboard Watt Meter $39.95 Time Remaining: 20d 12h 15m Buy It Now for only: $39.95 |
 Tenergy 100A 3 in 1 Self Balance Voltage and Watt Meter New $27.95 Time Remaining: 29d 17h 27m Buy It Now for only: $27.95 |
 Libra Meter 100A watt meter battery checker self balancer $26.05 Time Remaining: 18d 14h 54m Buy It Now for only: $26.05 |
 3in1 Watt Meter+LiPo LiFe Checker+Balancer+Servo Tester $25.59 Time Remaining: 7d 4h 8m Buy It Now for only: $25.59 |
 GT Power 130A Precision Watt Meter and Power Analyzer $42.74 Time Remaining: 16d 7h 44m Buy It Now for only: $42.74 |
 SKYRC Multi function Watt Meter $38.80 Time Remaining: 21d 22h Buy It Now for only: $38.80 |
 SKYRC eXTREME Power Analyzer Watt Meter Li Po Battery Checker Equalizer BK213 $33.90 Time Remaining: 8d 16h 27m Buy It Now for only: $33.90 |
 NEW RC Electronics Watt s Up Watt Meter Blue WU100 B NIB $53.99 Time Remaining: 29d 7h 33m Buy It Now for only: $53.99 |
 RC Electronic Watts Up Watt Meter Battery Monitor Onyx $47.99 Time Remaining: 5d 12h 50m |
 SKYRC Multi function Watt Meter $41.20 Time Remaining: 18d 14h 48m Buy It Now for only: $41.20 |
 GT POWER 100 AMP Watt Meter Battery Volt Meter Balancer USA SELLER $39.99 Time Remaining: 16d 3h 38m Buy It Now for only: $39.99 |
 NEW Integy Mutlifunction 100A Watt Meter LiPo Balancer C23613 NIB $35.99 Time Remaining: 7d 7h 43m Buy It Now for only: $35.99 |
 Libra Meter 100A watt meter battery checker $28.65 Time Remaining: 24d 14h 38m Buy It Now for only: $28.65 |
 Watt Meter tester test tool Measures Amps Watts voltage $36.98 Time Remaining: 24d 21h 37m Buy It Now for only: $36.98 |
 AEO Model P1 High Voltage and Precision Wattmeter AC069 $30.90 Time Remaining: 19d 21h 11m Buy It Now for only: $30.90 |
 RC LiPo LiFe Balancer+Servo Tester+Watt Voltage Meter $25.98 Time Remaining: 20d 21h 24m Buy It Now for only: $25.98 |
 LIPO WATTMETER POWER ANALYSER 130A with Plugs Fitted $46.90 Time Remaining: 5d 12h 13m Buy It Now for only: $46.90 |
 RC GT Power LIPO WATTMETER Watt Meter POWER ANALYZER 130A LCD Ver 20 $38.99 Time Remaining: 20d 23h 53m Buy It Now for only: $38.99 |
 TME Xtrema LiPo Battery Charger and Watt Meter $79.95 Time Remaining: 14d 4h 5m Buy It Now for only: $79.95 |
 Bantam e Station Two Meter Watt Meter Lipo Balancer $44.95 Time Remaining: 20d 25m Buy It Now for only: $44.95 |
 100A Battery Balance Voltage Power Analyzer Watt Meter $25.88 Time Remaining: 15d 14h 29m Buy It Now for only: $25.88 |
 eXTREME Power Analyzer Watt Meter Li Po Battery Checker Equalizer SKYRC BK213 $33.90 Time Remaining: 17d 16h 13m Buy It Now for only: $33.90 |
 100A Balance Voltage Power Analyzer and RC Watt Meter $25.99 Time Remaining: 22d 6h 2m Buy It Now for only: $25.99 |
 Integy C23613 Mutlifunction 100A Watt Meter LiPo Balancer $31.95 Time Remaining: 11d 4h 46m Buy It Now for only: $31.95 |
 LCD Balance Voltage Power Analyzer and RC Watt Meter $20.98 Time Remaining: 25d 4h 55m Buy It Now for only: $20.98 |
 MULTI METER SKYRC i Meter Multimeter 7 in 1 Battery Checker Watt Servo Thrust $63.98 Time Remaining: 14d 19h 19m Buy It Now for only: $63.98 |
 RC 01 to 100A R C Hobby Battery Voltage Watt Meter GTPOWER Model BK325 $25.90 Time Remaining: 24d 14h 6m Buy It Now for only: $25.90 |
 Neu RC lipo Battery Balancer Watt and Voltage Meter $25.98 Time Remaining: 17d 4h 16m Buy It Now for only: $25.98 |
 R C Hobby P1 HV High Voltage and Precision Wattmeter AEO Model BK151 $32.90 Time Remaining: 6d 15h 30m Buy It Now for only: $32.90 |
 GT POWER Model RC 01 to 100A R C Hobby Battery Voltage Watt Meter BK325 $25.90 Time Remaining: 22d 15h 51m Buy It Now for only: $25.90 |
 i Meter Battery Watt Servo Temp Optical 7in1 RC Multimeter SKYRC BK208 $53.90 Time Remaining: 17d 16h 13m Buy It Now for only: $53.90 |
 Astro Flight Digital Watts Volt Meter $54.99 Time Remaining: 12d 3h 8m Buy It Now for only: $54.99 |
 AEO Model P1 High Voltage and Precision R C Hobby Wattmeter BK153 $32.90 Time Remaining: 25d 11h 30m Buy It Now for only: $32.90 |
 AEO Model P1 HV High Voltage and Precision R C Hobby Wattmeter BK151 $32.90 Time Remaining: 18d 16h 39m Buy It Now for only: $32.90 |
 VP1 Watt Meter $44.99 Time Remaining: 15d 11h 34m Buy It Now for only: $44.99 |
 Astro Flight Digital Watts Volt Meter AST101D $68.15 Time Remaining: 1d 5h 59m Buy It Now for only: $68.15 |
 Integy 100A Watt Meter LiPo Balancer Servo Tester INTC23613 $35.19 Time Remaining: 8d 2h 52m Buy It Now for only: $35.19 |
 RC lipo battery Analyzer Watt Meter Checker Balancer $20.89 Time Remaining: 14d 2h 14m Buy It Now for only: $20.89 |
 SKYRC Watt Meter tester test tool Measures Amps Watts voltage $29.99 Time Remaining: 27d 4h 11m Buy It Now for only: $29.99 |
 GT Power LCD RC 130A Watt Meter Power Analyzer Ver2 $37.25 Time Remaining: 23d 21h 10m Buy It Now for only: $37.25 |
 GT Power LCD RC Model 130A Precision Battery Watt Meter Power Analyzer Ver2 $36.99 Time Remaining: 14d 1h 48m Buy It Now for only: $36.99 |
 GT Power LCD RC 130A Watt Meter Power Analyzer Ver2 $36.95 Time Remaining: 9d 23h 6m Buy It Now for only: $36.95 |
 RC lipo battery Analyzer Watt Meter Checker Balancer $31.59 Time Remaining: 29d 18h 56m Buy It Now for only: $31.59 |
 RC lipo battery Analyzer Watt Meter Checker Balancer $31.93 Time Remaining: 23d 21h 27m Buy It Now for only: $31.93 |
 GT Power voltage Watt Meter Analyzer 100A + XH adapter $28.66 Time Remaining: 23d 21h 10m Buy It Now for only: $28.66 |
 RC lipo battery Analyzer Watt Meter Checker Balancer $31.68 Time Remaining: 9d 23h 10m Buy It Now for only: $31.68 |
 Libra Meter 100A watt meter battery checker self balancer For RC Cars Air plane $48.85 Time Remaining: 18d 19h 12m Buy It Now for only: $48.85 |
Watt Meter
Why your 100 watt solar panel only generates about 70 watts
So you bought a 100 watt solar panel to charge to your battery thinking that it will deliver 100 watts. Well, I'm sorry to have to tell you it will probably only produce about 70 watts of usable power. Were you conned? No, you just have to understand 3 important facts about solar panels.
- The solar panel must be generating power at its maximum power point (MPP). Most solar panels will be operated away from their MPP depending on the set-up. The maximum power is only generated when the load resistance is at the correct level to obtain the correct voltage and current flow. The load is the technical term for everything that uses the power generated by the solar panel. In an ideal system only the device that you want to power is the load, for instance a battery you want to recharge, but in practice all the components that make up the system, such as connections and wiring and voltage regulation devices, use some of that power and contribute to the total load on the system. When the system load moves away from the optimum load then the PV module's voltage and amps will move away from the MPP and the solar module becomes less efficient, thus produces less power.
- The solar panel must be fully bathed in direct sunlight. Most of the time the solar panel will not be facing directly into the sun, there may be clouds or shadows obscuring the sun and there may be debris on the solar panel obstructing the sunlight. In a 100% efficient solar module the sun falling on an area of one square meter of solar panel would produce 1000 watts ( 1 Kw) but the average PV panel is about 15% efficient and produces about 150 watts (15% of 1000) per square meter of area.
- The solar cells temperatures must not exceed 25°C . Excessive heat has the greatest effect on the voltage generated by the cells. Don't be fooled by the ambient temperature, because when the air is about 10°C, the solar cell will be at about 40°C. Solar cells don't like heat, when the temperature rises then the cell produces less voltage. At 40°C a cell is producing 10% less voltage than at 25°C so on a typical summer day the cell may be at 65°C. and producing 80 watts instead of 100 watts.
All of these factors add to the total energy loss of the solar generating system so when you measure the actual usable power it will be less than the panel's rated output. For more details and diagrams see this article covering how to get the most out of your solar panel on our website at Ecopia Portable Solar
About the Author
John is a technical consultant for Ecopia the Australian portable solar power retailer. He has a background is in engineering and an interest in solar power and wind energy.
How can check load LED blink time in single phase energy meter 1600imp/kwh by 100 watt bulb?
SImilar to my other answer, turn off everything that the meter feeds and wait to make sure that the meter reading hasn't increased.
Then put in the bulb, turn it on and time the blink rate of the LED. It should blink once for every part of a unit that it measures - it might be 0.1 of a unit, might be 0.05 of a unit. Turn on the lamp and time how long it takes the LED to blink say 10 or 20 times. 100W bulb will use 1 unit every 10 hours, 0.1 unit every hour, 0.05 units every 30 minutes.
Might be easier to get the electricity company to check your meter if you think it is wrong otherwise why go to the effort of watching the meter for an hour or more?
Turnigy Precision Watt Meter and Power Analyzer
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