Make a Shunt Resistor - Electric Circuit. Make your own rough and ready shunt resistor home > electric circuit | education A shunt resistor (pictured above) is a high-precision resistor of very low resistance used by an ammeter to measure the current flowing through an electric circuit. Shunts are available in a range of sizes from under one Amp to many hundreds and thousands of Amps, but they can be very expensive. Fortunately it is possible to make your own shunt resistor from nothing more than a length of copper wire. While it will only be accurate to within 10%, and its accuracy will fall with changes in temperature much more so than would be the case with a real shunt resistor - making your own shunts is very cheap and easy and can also be an interesting education project. Example DIY Shunt Resistor In this example we will look at making a 0-10 Amp shunt resistor with a voltage drop of 10mV at 10 Amps. So, what do we need the resistance of our shunt resistor to be for a 10mv voltage drop at 10 Amps?
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My Air Compressor works on it fine also (maybe 5hp, 60gal, but I forget exactly). Ran an electric chainsaw off it alot on a 100' extension cord in the woods. I have a 4' 2 tube shoplight CFL unit, it often buzzes even on grid power, does not buzz on the inverter so far which really surprised me. Only thing I noticed is some of my box type fans seemed to run a little slower (and one had a hum on slower speeds) and that's considered normal on mod wave inverters so I haven't worried about it. Although my inverter is not in everyday high load use, it has been used alot, with fairly heavy loads, several times it's been ran till it shut off at about 10.5 volts which of course was the batteries limit of a small bank.
Parts for Lister Diesel Engines. $3 Wattmeter. Those who browse the RCG threads are probably convinced as I am that #1 cause of motor/ESC failure is lack of wattmeter. Here's a solution that is so inexpensive there's no excuse anymore for not checking run current. Also good for seeing how much juice that charger's putting back in your battery or watching voltage creep up to the magic 3.8v/cell for storage. It is based on the Harbor Freight multimeter that is always on sale for $2.99 in at least one of the active catalogs.
Any low cost meter will do. Only other component is any size resistor from 1k-10k or thereabouts. Switch to 20v to read volts and 10a to read amps (label says 10a but actually it reads up to 20a). Update: It's good up to 20a using the regular banana plugs and no modifications to meter. Below is a pic of the bulb I used to calibrate. Remember, you need heavier connectors and wire to handle higher current. Like Curtis says you can add solder to the shunt between the wires to reduce readings for fine tuning. Lookup IP address to Country, State, City, Netblock, Longitude and Latitude.
RC Groups - View Single Post - How to measure amps. Central Georgia Generator. Power Inverters 24 Volt DC to AC - DonRowe.com. Food Storage: Dry-Packing Food at Home - How to Use a Portable Dry-Pack Canner.