Archived Examples

Inverter for Air Compressor

Power Inverter Runs His Repair Van’s Large Air Compressors

I purchased the 5000 watt inverter along with the “bigger is better” battery for our mobile repair van. The primary use of the equipment, as can be seen in the attached picture, is for changing out tires on some commercial work trucks. (IRU Note: We lost the picture during the great server swap of 2016…sorry about that).

The main trick to make this “gasoline free” setup was to find a “continuous run” compressor that was capable of around 10cfm. Continuous run is important because the required amperage never really exceeds 19amps whereas your regular compressors stop compressing when a certain air pressure is achieved. The problem is that when you run the air pressure down on one of those regular compressors, the amperage to start compressing again can be huge, possibly exceeding the capacity of the inverter (it really depends upon the size of the compressor motor). We do need to be careful of one thing though, and that is that we must empty the air tanks after every use. Starting the compressor with air already in the tank is the same as the situation just mentioned for those regular compressors but its good practice to do this anyway to prevent moisture buildup in the tanks.

Soooo, for you techies out there that have been considering a setup like this and wondering if it would work, well I’m here to tell you that it does. And the battery really seems to hold its charge for quite a while. At this point, we just charge the battery in the shop when necessary but we are considering running it off the vehicles alternator with a switch.

If it wasn’t for this inverter and monster battery, none of this would have been possible.

Thanks Inverters R US!

Read more...
Boat Dock Inverter

Power Inverter Runs Boat Dock Lift, Fans & Lights!

After three years of building and going way over budget, our dream house on the marsh was finally finished. We had a wide open view of the inter-coastal waterway and constructed a shared walkway with our neighbor to our dock house with boat lift. Our walkway is 1400 feet in length.

Running water there was not difficult but electricity was another matter. The electrician said it would be over eight thousand dollars just run the electric to the dock. Connecting the lift motors and outlets was additional. We looked for another alternative. That’s when I came across Inverters R Us

We had two 12A 120 Volt motors to run a 10,000 lb lift in addition to any power tools ( we had to finish the screen porch) and lights.

I decided to purchase the Aims 5000 watt inverter, two lifeline GPL-8DL batteries and a air X marine wind generator. This was the only inverter I could find that could theoretically supply the over 30 Amp initial motor startup current by only using one plug tied to the motor control box. I was told that the four outlets could support up to 40 Amps either together or individually.

Well after a couple days of receiving my goodies in the mail we had it hooked up to try. To my surprise the lift motors started and ran just fine. I was able to raise and lower the lift about ten times before I received that irritating chirping telling me the voltage was too low in the batteries. As it turned out the limiting factor in my whole setup laid in the generating of power.

While there is always a breeze across the marsh, most of the time the amperage generated was between 2 to 4 . I finally added a 120W solar panel which significantly helped to recharge the batteries. We can now run lights and ceiling fan whenever we want at the dock area. It sure would be nice to run a tv or computer out there. To be safe we would need to use a true sine wave inverter for this equipment. Well maybe some day.

Rick McEwan

Read more...
Prius Power Inverter

Prius Owner Runs Power Inverter For Days After Storm!

Written by: Inverters R Us Customer, G.V.

I own a Toyota Prius. It has a 12-Volt battery, but it’s not under the hood; it’s in the passenger compartment, next to the spare tire. That makes it easy to permanently install an inverter next to the battery. It’s a bit tight, but you can fit a small inverter between the battery and the spare tire, and you can attach it to the body of the car with self-piercing metal screws after drilling small pilot holes in the body.

I did this for the first time several years ago with my first Prius. I replaced that car this past Summer with a new Prius and, soon after taking my new Prius home, I installed an inverter in it. The installation requires sawing away a piece of the styrofoam baskets that hold the tools. It felt a little strange taking a saw to my brand-new car, but it was for a good cause.

The Prius engine, as in most hybrid cars, does not idle in the conventional sense. The high-voltage traction battery powers the car under normal conditions without the engine running. The engine starts from time to time and runs for a few seconds, as needed to keep the traction battery charged. The engine in my Prius runs for only about thirty seconds every five minutes or so when it’s in “Park” with no accessories turned on.

The Prius has a 12-Volt electrical subsystem for compatibility with conventional cars. That way, it can use standard components such as light bulbs, windshield-wiper motor, etc. that are made for automotive use. However, unlike conventional cars, it does not have an alternator mechanically coupled to the engine for recharging the 12-Volt battery. Instead, there is a DC-DC converter that emulates the behavior of an alternator. Whenever the car system is “on” the DC-DC converter draws power from the traction battery to charge the 12-Volt battery; the voltage across the 12-Volt battery is kept at a constant 14.1 Volt when the car is “on”, as would be in a conventional car with the engine idling. In the Prius, this is so regardless of whether or not the engine is actually running.

I had to decide how big an inverter I could attach to the 12-Volt battery without overloading the 12-Volt system. In a conventional car, the 12-Volt battery has to be large enough to start the engine, and the alternator must be powerful enough to recharge that battery; but, in the Prius, the 12-Volt battery is much smaller because it does not have to start the engine. How much power can I safely draw without damaging the system? I approached the problem in two different ways. First, I located the circuit diagram for the Prius and I found that the 12-Volt system is protected by a 150A fuse. Certainly, I should not exceed (or even get close) to that limit. Second, I estimated how much current might be drawn, under normal conditions, by the car’s subsystems: headlights, audio system, rear-window heater, A/C fan, etc. If I don’t use any of those while I am using the inverter, that power is available for the inverter. I decided that I could probably draw nearly 1000W without trouble. This corresponds to a current of about 85A at 14V, assuming 85% for inverter efficiency.

I bought an 1100 watt inverter  for around $100, the price even included heavy-gauge wires!

As I mentioned, the inverter can be permanently installed in a Prius right next to the 12-Volt battery. This is good because the wires can be made very, very short: one wire is 6″ long and the other wire is 10″ long. With such short wires, the voltage that the inverter sees, even under heavy load, is virtually the same as the voltage across the battery; essentially, the inverter always gets a solid 14V when the car is turned on. This gives the inverter a good operating margin and makes it better able to handle surges with high efficiency. One thing to be careful about: one should remove the styrofoam baskets when operating the inverter to make sure that there is adequate air circulation for cooling.

I completed the installation this past Summer, shortly after buying my new Prius and… two weeks ago, on October 29, hurricane Sandy arrived (I live in NJ, near the coast). We were lucky not to suffer major damage, but we lost power, together with some six million of our neighbors.

When the lights went out, I had already set up my Prius in our detached garage, with a cable running from the inverter to our breaker box. All I had to do was to start the car, throw the transfer switch in the breaker box, turn on the inverter, and voila’ the lights were on. Well, to be honest, before getting to that point I had to turn off quite a few things in the house. After all, 1100W is not exactly a lot of power for an entire house; but in the following days we were able to have a relatively normal life with refrigerator, hot water, heat, lights, internet and television, all on 1100W!

We didn’t leave the house for over a week, but through our television we were able to see the incredible devastation that had swept our area. It was sobering and very sad to see how many people had lost so much. Our immediate neighborhood was lucky because no-one suffered major damage or injuries, but we were out of power for many days, and ours was the only house with lights on.

On the second day after the storm, we invited our neighbors over for dinner. People brought food that was spoiling in their refrigerator. Everybody was happy to meet their friends, enjoy some warmth, recharge cellphones, and watch TV. Most of our neighbors had not yet seen images of the storm’s damage. They were stunned.

After a couple of days of outage, some of our neighbors got generators. And then the gas shortage came. That’s when I realized that the Prius-with-inverter set-up had a major advantage over a generator that I had not envisioned: I had filled the Prius tank the day before the storm, and, by the time power was restored several days later, I still had almost half a tank of gas left. And I had kept the inverter on without interruption, 24 hours a day, through the entire power outage. My neighbors with generators were going through a five-gallon can of gasoline in less than a day!

The one inconvenience with my inverter was that, whenever I overloaded it, it turned itself off to avoid damage, and I had to manually reset it. This is normal behavior for an inverter, but it happened frequently, especially at the beginning as I figured out what loads it could and could not handle. We have a detached garage, which is good because I could leave the car turned on without fear of fumes entering the house; but resetting the inverter involved going from the house to the garage every time it happened. I had to do it many times during the height of the storm, and I confess that being outdoors at that time was rather terrifying.

So, when things went back to normal, I went on the inverters-r-us web site and I found, to my delight, that they sell inverters with a remote switch!! I quickly ordered one. I made sure that the size is small enough to fit in the space available in the Prius. Now, when the next storm comes, I will have power and I can trip the inverter as many times as I want without having to go out in the storm to reset it!

Click here to see some PSW inverters that will work with a Prius!

Read more...
CPAP Power Inverter

CPAP User Sleeps Easy Using A Power Inverter!

I’m no different than the others; MY inverter is a life saver…. The main thing I use my AIMS inverter, is to power my CPAP machine at night, (cpap is for sleep apnea) it is invaluable, we were unable to rough camp prior to buying an inverter, as I must have 110v to run it, and the whole idea of rough camping is the quiet and solitude, (running a generator is neither quiet nor by any means solitude).

This has free’d up my life, allowing us to go anyplace, and enjoy the great outdoors. During the day, our inverter is used for radio, and or TV, we have the best of both worlds!

I wish to thank you for making this possible, you have provided a venue that allows everyone to enjoy the uses of an inverter, by offering pure sine wave power inverters at a reasonable price, and with great quality too!

Now with the price of gas gone shy high, this allows us to use battery power, instead of firing up the genset, again, saving money and helping everyone enjoy the great outdoors!
One additional feature that we recently experienced was a power outage, for over 12hrs!

I was able to use my inverter, connected to a battery, and get my much needed beauty sleep (I’m 56yrs old, and my wife says I’m crazy, that nothing will ever help!).

Thanks!

L. Wxxxxxxx

Read more...