Pure Sine Wave vs Modified Sine Wave for fridge

You might consider adding an inverter dedicated to the refrigerator.

Hi,

This might help you decide:

Hi all,

This protocol was suggested by mexicowanderer whom I have the greatest respect for:

TEST: Shore power versus alternative power. Put glass of water in microwave and start, if voltage drops to 109 vac or less at same outlet as microwave is plugged into, end of test. Energy source is inadequate.

Stage 2 Same glass of water, start at room temperature with oven thermometer. Set timer for one minute high. Remove glass measure temperature on shore power

Stage 3 Do the same with alternative power source and compare temperature difference to test above.

If there is a large temperature difference, then your microwave is going to unlove you trying to suffer through inadequate voltage or waveform.

RoyB wrote:
Some of the HIGH DOLLAR HIGH END Modified Sine Wave units will work... I wouldn't do it myself but mayby you should try out something with a motor like maybe a 20-inch portable fan. If the motor speeds up normal and DOES NOT START GETTING HOT OR MAKING LOUD HUMMING NOISE then you should be OK I guess...

We have found anything with motors-transformers-solid stat electronics really need the PURE SINVE type Power Inverters. These duplicate the SINWAVE much like is being produced from the shore power and generator connections...

Again I would not do that here as I have always purchased PURE SINE WAVE Power Inverters which works well with all things RV Camping...

I did have a HIGH END 2000WATT House UPS Setup that had internal Batteries to swith to when loss of power. It was a MSW type Power Inverter circuit and looked good with an oscilloscope hooked up to the unit and worked with everything I had conencted to it. This was a high dollar item however...

I kinda put the Xantrex Freedom 458 in the high end catagory just because of the cost of the unit... What you are reading about on-line is these cheap built and low cost chinese items that you find in the auto parts stores and Walmart-Lowes...

Hopefully some one on here that has the Xantrex unit will dime in here... but a local test using a 20-inch portable electric fan might give you an good feeling as well... You can tell right away if it is not liking your Modified Sine Wave. It will HUM real loud and try to run at a normal high speed when you plug it. If you leave it plugged in very doing this thene you will soon see the so called 'BLUE SMOKE' coming out of the motor for a few seconnds then it is toast... Your fridge uses an electric motor so it will do the same thing if it doesnt like your MSW Power Inverter.

Just my two cents from experience..
Roy Ken

That is my fear. I do not want to spend $1200 on a fridge and the time and trouble to install it then toast it the first time I run it on the inverter.

Some of the HIGH DOLLAR HIGH END Modified Sine Wave units will work... I wouldn't do it myself but mayby you should try out something with a motor like maybe a 20-inch portable fan. If the motor speeds up normal and DOES NOT START GETTING HOT OR MAKING LOUD HUMMING NOISE then you should be OK I guess...

We have found anything with motors-transformers-solid stat electronics really need the PURE SINVE type Power Inverters. These duplicate the SINWAVE much like is being produced from the shore power and generator connections...

Again I would not do that here as I have always purchased PURE SINE WAVE Power Inverters which works well with all things RV Camping...

I did have a HIGH END 2000WATT House UPS Setup that had internal Batteries to swith to when loss of power. It was a MSW type Power Inverter circuit and looked good with an oscilloscope hooked up to the unit and worked with everything I had conencted to it. This was a high dollar item however...

I kinda put the Xantrex Freedom 458 in the high end catagory just because of the cost of the unit... What you are reading about on-line is these cheap built and low cost chinese items that you find in the auto parts stores and Walmart-Lowes...

Hopefully some one on here that has the Xantrex unit will dime in here... but a local test using a 20-inch portable electric fan might give you an good feeling as well... You can tell right away if it is not liking your Modified Sine Wave. It will HUM real loud and try to run at a normal high speed when you plug it. If you leave it plugged in very doing this thene you will soon see the so called 'BLUE SMOKE' coming out of the motor for a few seconnds then it is toast... Your fridge uses an electric motor so it will do the same thing if it doesnt like your MSW Power Inverter.

Just my two cents from experience..
Roy Ken