POW-RELAB 10KU-SPLIT Low Frequency Inverter

[Mav986]

Was looking at this AIO inverter, but I'm not sure this is a true US spec Split Phase (L1/L2/N) inverter. Can I feed a 100A 120/240V sub panel?
I was interested in this inverter because I need a 60-150V MPPT since my 4 PV arrays are often shaded and I configured them in 3s/4P now.

For a low frequency 10kW AIO inverter at a price point of ~ $1,000, it seems like a good deal.

 

[rodrick]

The max on 240 volt would be 41.5 amps or 83 amps on 120 volt or somewhere between those figures if running both voltages

 

[CaliSunHarvester]

The description 220V AC between N and L1 is not what I expected.
Not sure if this integrates easily into a standard US residential power setup.
They usually have 220V L1-L2.

The description how to get 110V is also not clear to me, which likely is my problem (not knowledgeable), not the document's problem.

It's also unusual to write 220V in a U.S. context. I usually see 240V.

 

[CaliSunHarvester]

If you are looking at this model, the pictures indicate single phase. But it's a low frequency inverter!

(The manual page shows "RELAB 10KU" like in your document and thread title.)

10KW 220V 48V Low Frequency Solar Inverter

48v low frequency inverter with 120a mppt solar charge controller integrated. Realize AC 220v and DC 48V bidirectional conversion.

powmr.com

 

[rodrick]

The description how to get 110V is also not clear to me, which likely is my problem (not knowledgeable), not the document's problem.

The description shows L1 and L2 which makes you think it’s US plus 60Hz but they’re documenting is lacking clarity

 

[CaliSunHarvester]

The description shows L1 and L2 which makes you think it’s US plus 60Hz but they’re documenting is lacking clarity

I am thinking the price is so good because it's for Europe or Asian countries that have 220V single phase. I have noticed before that they are quite a bit cheaper, supposedly because it's a bigger market compared to U.S. alone.

 

[rodrick]

I am thinking the price is so good because it's for Europe or Asian countries that have 220V single phase. I have noticed before that they are quite a bit cheaper, supposedly because it's a bigger market compared to U.S. alone.

What’s got me wondering is it shows 110 volt not 120 but is it just poor documentation or some weird unit for some foreign country that uses 110 volt ?

 

[Mattb4]

I am thinking the price is so good because it's for Europe or Asian countries that have 220V single phase. I have noticed before that they are quite a bit cheaper, supposedly because it's a bigger market compared to U.S. alone.

There was a discussion about this AIO a few months back and the confusion about whether it is capable of US split phase was not only from a user standpoint but a engineer that a member contacted over at PowMr also did not fully understand. LF style inverters use a large transformer on the output. If you wire across the entire transformer you get 220vAC. If you wire to a midpoint and an end you get 110vAC. Being Euro/Asia centric the designers called one end of the transformer L1, the midpoint L2 and the other end N.

Thus L1- L2=110vAC
L2 - N=110vAC single phase
L1 - N=220vAC single phase Euro standard

Now can it be relabeled such that you consider L2 as N and N as L2 to produce US standard?
L1 - N=110vAC
N - L2=110vAC
L1 - L2=220vAC

Possibly but a question comes up about if the transformer output is wired such that one transformer end is internally bonded to case ground. I would not think so but hopefully someone that bought the AIO can chime in and tell us if they managed to make it work properly split phase.

 

[Mav986]

I think the other issue is that the AC feed in is 120V. So that will create an imbalanced load on the main service panel.

 

[SparkyJJO]

It is cheap because it is weird.