AstroFlight Data Logging Watt Meter.

A play on words, but the name is Whatt Meter. see details:

It displays, Amps, Volts, Watts and accumulated Amp Hours (up to 94 amp hours). It stores information until the power is disconnected.

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Welcome to the AstroFlight Store 3 Watson Irvine, California 92618 Ph. 949-855-9903 fax 949-597-1729
Welcome to the AstroFlight Store
3 Watson
Irvine, California 92618
Ph. 949-855-9903
fax 949-597-1729

Item number and price (not including shipping or tax for CA):
101N Super Whattmeter With No Connectors

Product Specifications

Stock Number p/n 101N
Maximum Voltage 60 volts
Minimum Voltage with no receiver battery 4.5 volts
Minimum Voltage with receiver battery Zero Volts
Maximum Amps while discharging 50 Amps
Maximum Amps while charging 10 Amps
Maximum Power 3,000 Watts
Current resolution 10 Milliamps
Voltage resolution 20 Millivolts
Power resolution 0.1 Watts
Maximum amp hours 94 Amp Hours
Amp Hour resolution 0.01 Amp Hour
Current Consumption 10 Milliamps
Bare Wire No connectors

It installs (in series) between the Male plug coming out of the Electrical Box and the Female side of the extension cord going to the battery. It will store data as long as you keep the battery connected to the Whatt meter

This model does not come with connectors.

See "Electrical Box and Battery Connector / Wiring." for details how to wire it. :


See "Generator, swing-arm and Electrical Box install manual." for details how to install it. :


Below is an E-Mail I sent AstroFlight and their reply.

First there is a red connector where if you provide power to it, the Whatt Meter can be used to measure less than 4.5 volts. In this application by providing power to this connector with 6 volts, or 4 AAA or 4 AA Alkaline batteries, or rechargeables, it will maintain the data - logged information even if the lead acid battery is unplugged.
The data - logging of watt hours and amp hours is accumulative. It will accumulate if the battery is charging or discharging. Thus you don't want to let the battery run the generator as a motor and turn the rear wheel or it will log as amp hours or watt hours of power generated.
It's very easy to keep the generator charging and just flip off the switch when you want to stop generating power.
Of course a Schottky diode could be inserted in series and the generator would never run as a motor, but it drops about .6 volts. At 4 amps, that's about 2.4 watts of energy lost or 5% waste. At 2 amps, that's about 1.2 watts lost, again 5%. A regular diode has about a 10% loss. For me to gain 5% efficiency I will live without the diode.

Date: Tue, 6 Sep 2011 11:45:47 -0700
Subject: Re: David please answer 3) questions on Whatt meter 101N

Hi Ron,

1) The meter will read 30AH. It sums the current, regardless of direction.

2) The meter will read 10AH.

3) You can have both plugged in to keep logging the info. As long as the 4AA's have enough voltage, your data should keep logging.

Hope this helps!


David Chen
949 855 9903

On 9/6/2011 11:21 AM, Ronald Parigoris wrote:

Hi David

Thx. for taking the time to answer my questions on the Two Whatt Meters I just purchased and are due to arrive sometime today.

1) If I hook up a 9aH Lead Acid battery to a 12 volt permanent magnet motor through your Whatt Meter and discharge the battery by running the motor at 10aH for one hour, then turn the permanent magnet motor fast enough to generate 10aH of power for two hours what would the Whatt meter read?

In other words discharge the battery for 1 hour @ 10aH, then charge the battery for 2 hours @ 10aHs? Would the Whatt Meter read 10aHs? Or 30 aHs

2) The next question is similar, if you discharged the battery for 1 hour @ 10aHs, would the meter read 10aHs, or (10)aHs?

3) If I wanted to keep the Whatt Meters aHs logging alive, would it be OK to keep a pack of four AA batteries in series (~ 6 or so volts) plugged into the receiver plug? I would like be able to connect and disconnect a 12 volt Lead Acid battery, and charge and discharge it but not lose the logging information as long as I keep the receiver plug supplied with ~ 6 volts. Does this sound like it will work for me?

Ron Parigoris

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