For my off-grid Ham Radio and Solar projects, I needed a way to measure volts, amps, watts, amp hours and watt hours. There’s a couple of commercial products that can do this, but not with the flexibility I wanted. I designed a Arduino micro-controller based solution that is very extensible. Right now it monitors the above values of attached gear, and I’m thinking about adding web monitoring and a sd card for data collection. Well, let’s get started. Here is the circuit for sensing the battery voltage: The Arduino can accept up to 5v on a analog input. Our battery voltage can range as high as 17vdc in certain charge cycles, so we designed a voltage divider that would provide 5v at 17v battery voltage, and less at various lower voltages. The code to read that value is as follows:
Watt’s Up DC Amp Meter & Amp Hour Meter Connections
We have often talked about putting in a 30 amp breaker and RV style outlet for the camper at the house. Add to that any other electrical devices in your camper and you quickly see why a 30 amp electric supply is needed. Most standard household plugs only supply 15 amps, so using a common adaptor to allow the 30 amp RV plug to be inserted into a standard household 15 amp outlet may be quickly overloaded.
RV Converters and Amp Draw Mark J. Polk. Some time ago I wrote an article about basic RV electricity. I received so many questions and comments from readers that the next month’s article was a follow up with additional information on RV electrical systems.
Tube Stuff Suppliers Appendix B. Tube amps have always been the amplifier of choice for the working musician. Musical myth has ascribed almost magical tone to them. While the results may not be entirely magic, tubes do have a sound that is different from solid state amplifiers, and one that happens to make amplified music sound better to the human ears and brain. There are lots of technical and psuedo-technical explanations for why this should be true, but there is enough solid evidence that it is a real effect to trust it.
The real reason to use tube amps is simply that they sound better. For that advantage, we put up with the poor supply of parts, high prices, fragility and excess heat that they produce. Are Tube Amps louder than solid state amps of the same power? Some excellent scientific work on tube preamplifiers and their distortion products has turned up the mechanism for this. When tubes are driven outside their linear region, for the first 12db or so of overdrive the harmonics that they produce trick the human ear into thinking that the sounds are getting louder, when in fact the sound is getting progressively more distorted.
It is this acoustic trick that can make tube amps sound up to 12db louder than they actually are compared to a perfect, undistorted amplifier.
Easy Test of Battery Amp-Hours Capacity
In either case, the result is that you intentionally add voltage drop to the line. Using a current transformer can help solve this problem, since AC current is easier to handle than DC. A current transformer has an added benefit — the measuring circuit is isolated from the current being measured. There is also a way that you can do it with DC current. This project will provide you with an adapter that can be used with your voltmeter and will measure amps DC.
Theory of Operation In the simplified schematic Figure 1 , a free-running square-wave oscillator multivibrator is built around a voltage comparator and a toroidal inductor.
AMP gauges at the dash are troublesome. But when the electrical system will be up-graded with more powerful alternators and more accessories, the AMP gauge should be removed, and the “main power system” should be modified. Affordable labor could consistently connect wires with “ring terminals” at screws or studs with nuts.
This depends on how fast you want to charge your battery and the size of the actual battery you are charging. The higher the amp setting, the faster your battery will charge. Check your battery specifications for the charge rate. Certain batteries like deep-cycle batteries with a Group Size of 27 or higher may require a amp charge rate or higher to be charged. Why doesn’t my battery charger shut off in the 2-amp position when charging my vehicle or deep-cycle battery?
The 2-amp charge rate is intended for small batteries such as motorcycles, snowmobiles and lawn garden tractors.
Are you sure that you want to delete this answer? Yes Sorry, something has gone wrong. To work properly, an amp-meter must be in series with the entire positive cable feeding the boat’s electrical systems EXCEPT the large cable going directly to the starter.
Jan 16, · Amp meter wiring diagram? to connect a long piece of cable from the battery side of the cut up to the meter’s “+” terminal; then run another large cable from the meter’s “-” terminal back to connect with the cable feeding the electrical system on the other side of the cut. How to wire up an amp meter in my boat? Answer Status: Resolved.
Use F11 to go to full screen viewing if using Google Translate. Digital Multimeter A multimeter is one of the most useful tools for troubleshooting or installing a car audio system. Most meters have a rotary selector switch but a few have pushbuttons to select the desired mode resistance, AC voltage, DC voltage If there are buttons and a rotary selector switch, the buttons are likely to select options for the various modes. The meter below has a rotary selector switch. You should also notice that it has four terminals banana type jacks below the selector switch in which you place the leads.
This instrument will let you check to see if there is voltage present on a circuit. By doing so, a multimeter can help you achieve a variety of useful tasks, such as measuring ohms, volts, and amps. This has the arc-shaped scales visible through the window and a pointer which will indicate the values read from the scale. These determine the ranges of magnitude. A wider mirror-like surface shaped like the scales might also be present.
The mirror is used to help reduce what’s called “parallax viewing error,” by lining up the pointer with its reflection before reading the value the pointer is indicating.
Get power on the go This heavy duty Power Inverter which plugs directly to a Volt DC battery to power Microwave Ovens, Power Tools, Televisions, Gaming consoles, Home Electronics and small appliances in Price: $
The tangent galvanometer was used to measure currents using this effect, where the restoring force returning the pointer to the zero position was provided by the Earth’s magnetic field. This made these instruments usable only when aligned with the Earth’s field. Sensitivity of the instrument was increased by using additional turns of wire to multiply the effect — the instruments were called “multipliers”.
The word makeup is similar to that of rheostat also coined by Wheatstone which was a device used to adjust the current in a circuit. Rheostat is a historical term for a variable resistance, though unlike rheoscope may still be encountered. It uses magnetic deflection , where current passing through a coil placed in the magnetic field of a permanent magnet causes the coil to move. The modern form of this instrument was developed by Edward Weston , and uses two spiral springs to provide the restoring force.
The uniform air gap between the iron core and the permanent magnet poles make the deflection of the meter linearly proportional to current. These meters have linear scales.
RV Information from Kampgrounds of America, Inc.
Can DC ampere be measured with AC amp meter? The ammeter must be designed to measure DC. Some clamp-on ammeters are designed to measure both AC and DC. How do you connect an amp to a stock stereo so that the amp turns on and off with the car not wasting the battery? DO NOT go putting wires into your fuse box, this could cause problems in the future, if you have a power Antenna wire on the back for your radio, [Blue in Most cars, but refer to your cars manual.
NEW>>> LINX Power Panel. At only ” X ” X ” and only 7 ounces, it is small enough in size/weight to mount atop your telescope and delivers up to 30 Amps to your power hungry devices.
Built in heater option for IPP-C If one night you prefer to connect to a 10 amp 12 vdc battery, you can. If you want to take the Imaging Power Panel to a one week star party and connect it to a amp battery, you can. There are no limitations. If your battery dies, you do not have to throw out Imaging Power Panel. You simply reconnect it to a new battery! The Imaging Power Panels, depending on the type of equipment you use, come with: Owner must choose appropriate length cable for our list when purchasing.
Active 7 port USB Hub. Hub is Full Speed V2. DSLR versions have one port converted to an 8 vdc power supply and that port becomes a DC barrel connector. The Imaging Power Panels come in several configurations and may also be customized, with certain limitations, to your needs. We can use other connectors so if you prefer the use of a connector other than the standard cigarette lighter sockets, let us know. If we can accommodate you, we will.