WZRELB Reliable 3000W doesn't seem to output anywhere near 3000

I purchased a 3000 Watt WZRELB inverter and it runs my lower wattage appliances without issue. However --- if I put something bigger on it, like my air compressor the pulls 1400 Watts, it simply wont run it.

For context: I have two Amperetime 200ah lithium 12V batteries running in parallel to the inverter with 4/0 (4 aught) wire as the supply. That should be delivering all the current the inverter needs.

Anyone else have troubles with these inverters delivering the advertised watts?

krfish said:

I purchased a 3000 Watt WZRELB inverter and it runs my lower wattage appliances without issue. However --- if I put something bigger on it, like my air compressor the pulls 1400 Watts, it simply wont run it.

For context: I have two Amperetime 200ah lithium 12V batteries running in parallel to the inverter with 4/0 (4 aught) wire as the supply. That should be delivering all the current the inverter needs.

Anyone else have troubles with these inverters delivering the advertised watts?

Click to expand...

Motors can use 3-5 times their nominal rating to get the rotor spinning.
1400 watts nominal would be ~11.66 amps at 120 volts.
It could take 35 to 58.33 amps to get that rotor spinning.
If you really need to get the compressor running off an inverter I suggest you measure its in-rush current with a clamp meter that supports that function.

Your air compressor doesn't pull 1400W. Your air compressor likely pulls 6000-7000W the instant it is turned on. Over the course of a few seconds, it drops to 1400W.

"but my inverter says it has a 6000W surge!" yeah. It does... for about 20 milliseconds

I have the 24V/2000W version, and it choked on my 3/4 jet pump that pulls about 800W continuous.

You need a big heavy inverter with a big transformer in it that can handle a big surge for many seconds.

sunshine_eggo said:

Your air compressor doesn't pull 1400W. Your air compressor likely pulls 6000-7000W the instant it is turned on. Over the course of a few seconds, it drops to 1400W.

"but my inverter says it has a 6000W surge!" yeah. It does... for about 20 milliseconds

I have the 24V/2000W version, and it choked on my 3/4 jet pump that pulls about 800W continuous.

You need a big heavy inverter with a big transformer in it that can handle a big surge for many seconds.

Click to expand...

Let me add another question to this then: I have a Natural Gas furnace that pulls 11.7 amps at 120V at startup and this inverter will also not run this appliance. I have a kilowatt to measure the current and tested the furnace on city power before trying the inverter. The furnace has an inductive load that heats a thermal rod to ignite the gas. If I am doing my math right, that is 1404 Watts. Are these kinds of loads unreasonable for inverters?

You have to size inverter to the peak/surge power required for your loads which can be many times higher than the steady running power. You can use a clamp meter that can measure the peak current to find the max starting current for loads.

Loads with surge that exceed maximum continuous power are unreasonable for cheap high frequency inverters with poor surge (your inverter).

Your furnace likely has a blower motor that contributes to surge. Concerning the "inductive load," that sounds more like a resistive load, i.e., passing current through a heating element. heating elements do have a small surge due to lower resistance at room temperature.

If possible, have you tried starting the furnace blower separately from the heating element?

My Quattro barely notices my RV A/C, the aforementioned jet pump, and a 1600W microwave at the same time, etc. It's good to 10,000W for 20s.

You need to spend more.

This one:


Is basically the same as an AIMS (both made by Sigineer in China). My neighbor has the 6kW version, and he uses it to start his 700' deep well pump... 4000W continuous with a surge around 15,000W.

krfish said:

if I put something bigger on it, like my air compressor the pulls 1400 Watts, it simply wont run it.

Click to expand...

Can you elaborate on “it simply won’t run it”?

Does the compressor just not run or does the inverter cut out (and alarm and show error code or ?)

@sunshine_eggo Not enough coffee, yes I did mean inductive. Oddly enough, the furnace fan starts and runs with no problem, I just can't get the furnace to ignite. The link you provided is the inverter that you are using?

@MisterSandals: The compressor tries to run, but just moves slowly. It never gets "up to speed" and the inverter's output volt meter drops to like 89 Volts.

​

krfish said:

I purchased a 3000 Watt WZRELB inverter and it runs my lower wattage appliances without issue. However --- if I put something bigger on it, like my air compressor the pulls 1400 Watts, it simply wont run it.

For context: I have two Amperetime 200ah lithium 12V batteries running in parallel to the inverter with 4/0 (4 aught) wire as the supply. That should be delivering all the current the inverter needs.

Anyone else have troubles with these inverters delivering the advertised watts?

Click to expand...

I have the same inverter and it will start my 10 amp shop vac without issue, but only if my 4 100ah batteries are at full charge. I never tried my air compressor as I don't plan on running it off the inverter. If the batteries are slightly discharged it will kick off on low voltage at the inverter. My 4000 watt AIMS inverter would start those things with ease because it's low frequency and can surge to 12000 watts for a short time. I use it to run my submersible well pump in emergencies.

krfish said:

@sunshine_eggo Not enough coffee, yes I did mean inductive. Oddly enough, the furnace fan starts and runs with no problem, I just can't get the furnace to ignite. The link you provided is the inverter that you are using?

Click to expand...

I am not using that inverter. My neighbor is using the 6000W version of the same brand of inverter (24V). I am confident that the inverter I linked with its 9000W surge capability can power the loads you've described.

krfish said:

@sunshine_eggo The link you provided is the inverter that you are using?

Click to expand...

Oddly enough I have both inverters in 48V 3kW configuration.

The WZRELB HF choked on a 12,000 pound boat lift with dual 120V AC motors. It would sometimes work if I stagger started the motors but fell on its face most times.

The Sigineer LF runs it fine, even if I start the motors simultaneously.

WZRELB surge time is rated in milliseconds.

Sigineer can do 9kW surge for 20 seconds.