MPP lvx6048. High or low frequency

[ericfx1984]

@Will Prowse posted a video a while back... He did a review on the LVX 6048

Other than the high idle consumption he seemed to give it pretty high marks and he reported that it was a low frequency inverter

However I'm confused because a lot of people are now suggesting that it is in fact a high frequency inverter

So what's the truth? The internal construction certainly looks like a low frequency inverter... And the grand scheme of things if it is in fact a high frequency inverter then the price tag is pretty darn high all things considered

 

[Will Prowse]

Yeah it's more of a hf with a transformer. Somewhat of a hybrid. Performance is similar to LF inverter for inductive loads. You can start some pretty big well pumps with this unit. If you don't have large inductive loads, stick with another one. It's a pain to mount due to it's weight.

 

[iamrich]

I have two of them. They are high frequency with a big transformer. I haven't been able to throw anything at either of them yet that they couldn't run (1.5, 2.5 ton AC, microwave, vacuum, shop vac, griddle, coffee maker, etc.).

Downside is they are noisy, very noisy. I have them in an insulated mechanical room, and I can hear them through the walls at idle. The transformers hum and when the power demand picks up (or you dump a ton of solar into them) the fans spin up and sound like a jet trying to take off. I would not put these in a house or RV (or anywhere you are going to live) because of the noise. I have only been using mine for six months, and they have been rock solid, but I will eventually cycle them out to the garage in favor of something quieter.

 

[Badgerz]

Its high frequency, i checked with MPP solar. they say "it was tested to 2X with resistive loads in a lab but do not recommend going over 6K" see my other post regarding this unit. BTW i have 2 of them.

 

[ericfx1984]

Yeah it's more of a hf with a transformer. Somewhat of a hybrid. Performance is that ig a LF inverter for inductive loads. You can start some pretty big well pumps with this unit. If you don't have large inductive loads, stick with another one. It's a pain to mount due to it's weight.

Well... I already bought it... Maybe I'll just run more crucial loads on it and run a few cheapy hf units for this like minisplits

This is for a 100% off grid cabin... I bought it as it could start heavy loads... But now I doubt I'll have big starting loads in the house...

 

[Will Prowse]

Well... I already bought it... Maybe I'll just run more crucial loads on it and run a few cheapy hf units for this like minisplits

This is for a 100% off grid cabin... I bought it as it could start heavy loads... But now I doubt I'll have big starting loads in the house...

What is your biggest load

 

[ericfx1984]

What is your biggest load

Maybe a 24000 BTU minisplit or a clothes dryer(though not at the same time)

Everything else is some laptops, a small TV, hifi stereo... Ham radio gear, lights and other miscellaneous stuff...

We've been getting by in a very energy and efficient RV with just 3,000 Watts and we've never tapped that so I don't imagine an extremely well insulated house that's built specifically for this will really need much more power than that

 

[AntronX]

Its basically a high voltage 400Vdc to 240Vac inverter with auto transformer built in for split phase. I think its a misnomer to call it a high frequency inverter and the type with 27V to 120/240 step up transformer (like Schenider XW6848) a low frequency inverter. Both topologies use high PWM switching frequency to form sine waveform and 50/60hz commutation on the other half of H-bridge for polarity switching. I think more accurate name is high or low voltage inverter.

 

[ericfx1984]

Its basically a high voltage 400Vdc to 240Vac inverter with auto transformer built in for split phase. I think its a misnomer to call it a high frequency inverter and the type with 27V to 120/240 step up transformer (like Schenider XW6848) a low frequency inverter. Both topologies use high PWM switching frequency to form sine waveform and 50/60hz commutation on the other half of H-bridge for polarity switching. I think more accurate name is high or low voltage inverter.

400vdc?

 

[AntronX]

400vdc?

48Vdc > 400Vdc > 240Vac or DC-DC-AC. Topology of "high frequency" inverter.
48Vdc > 27Vac > 120/240Vac or DC-AC-AC as in "low frequency" inverter.
PWM switching frequency is about the same in both types, around 16 - 23kHz.

 

[ericfx1984]

48Vdc > 400Vdc > 240Vac or DC-DC-AC. Topology of "high frequency" inverter.
48Vdc > 27Vac > 120/240Vac or DC-AC-AC as in "low frequency" inverter.
PWM switching frequency is about the same in both types, around 16 - 23kHz.

I'm following you now

 

[moorsb]

I own 5 LVX6048 in an offgrid application running mini splits, and have had No luck getting them to work in parallel mode for more than 24hrs before I get a fault. Does anyone have them running dependably in parallel mode. I have 2 locations that I have tried running in pairs but both location are not solid so I have split the load and run them in stand alone mode, which seems to work. I question the application of running the max number as they are very battery voltage sensitive and if not all reading the same battery voltage it will fault. Anyone have them running in parallel?
I set one unit as a charger and turn off the inverter pushing 100 amps to the battery bank and the other to run loads and drop it's charger level to 20amps that seems to work as I have enough solar PV to do both and by 1 pm my batteries are fully charged ready to run my 3 mini splits all night

 

[copec]

48Vdc > 400Vdc > 240Vac or DC-DC-AC. Topology of "high frequency" inverter.
48Vdc > 27Vac > 120/240Vac or DC-AC-AC as in "low frequency" inverter.
PWM switching frequency is about the same in both types, around 16 - 23kHz.

I was searching for something else, but I wanted to add that low frequency or high frequency is to be understood as the frequency of the waveform being used in the power transformers (or inductors) and not the PWM frequency used to create the waveform.

Further, I would qualify a “low frequency inverter” in the colloquial sense as one that uses line frequency with a single stage H-bridge from the battery bus so there isn’t an intermediate stage that limits the surge.

 

[moorsb]

Yeah it's more of a hf with a transformer. Somewhat of a hybrid. Performance is similar to LF inverter for inductive loads. You can start some pretty big well pumps with this unit. If you don't have large inductive loads, stick with another one. It's a pain to mount due to it's weight.

I took the transformer out to mount them reinstalled it. Four nuts and three wires to remove