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New 10kw NHX AIO From Watts247

CuriousJohn said:
Self Consumption mode will offset any loads that the CT's detect. So for instance you put your CT's in your main panel, with the arrow's facing the grid. The inverter will offset those loads. It will push power out on the grid input to zero out those loads, varying the output up and down as needed.

Here's the picture from the manual to how you pick that behavior.

View attachment 206751

Other manufacturers use Zero Sell or Zero Export, but Zero Export here has a different meaning. For the NHX, Zeo Export means you can't export to the grid input at all.
Click to expand...
On Zero Export and a large inductive load shuts off, is there any export? That was one of the problems when the 18Kpv was released, it would export a small amount to grid.
 
Zwy said:
On Zero Export and a large inductive load shuts off, is there any export? That was one of the problems when the 18Kpv was released, it would export a small amount to grid.
Click to expand...
I have not done the fine testing to see if there are short bursts of export. I'm sure there is, as if you think about it - any system that measures and then responds is going to have some finite amount of lag. Unless you maintain a large buffer of input power from the grid as Victron does, it will be impossible to guarantee no export at all.

For me - I plan using this on a subpanel, so if a little gets pushed backwards into the rest of my house, it is not a big deal. I'm essentially maintaining a buffer of input power by virtue of using this on a subpanel.

Long term - I don't want ANY export either. If I were to use this on my main panel, I would probably set up a small load - perhaps 100-500 watts that are in place up-stream from the CT's. That would be my buffer. I would probably also use a current activated switch to shut down the grid connection to the NHX if any reverse flow was detected.

The nice thing about this inverter - for me, is that it is big enough that I can power a lot of loads on the output, and I don't HAVE to use the export feature if I don't want to. It's appealing to use it, because I don't have to do a lot of rewiring and shifting things around.
 
Zwy said:
On Zero Export and a large inductive load shuts off, is there any export? That was one of the problems when the 18Kpv was released, it would export a small amount to grid.
Click to expand...
Yes, there will be export.

Look at these graphs. You will see that even with fast zero export turned on, there is some slight backfeed going back to the grid. It's unavoidable.

Thread '18kpv inconsistent solar unless in off-grid mode' https://diysolarforum.com/threads/18kpv-inconsistent-solar-unless-in-off-grid-mode.81682/
 
Zwy said:
On Zero Export and a large inductive load shuts off, is there any export? That was one of the problems when the 18Kpv was released, it would export a small amount to grid.
Click to expand...
That was early firmware, it was fixed a while back.
 
CuriousJohn said:
I have not done the fine testing to see if there are short bursts of export. I'm sure there is, as if you think about it - any system that measures and then responds is going to have some finite amount of lag. Unless you maintain a large buffer of input power from the grid as Victron does, it will be impossible to guarantee no export at all.

For me - I plan using this on a subpanel, so if a little gets pushed backwards into the rest of my house, it is not a big deal. I'm essentially maintaining a buffer of input power by virtue of using this on a subpanel.

Long term - I don't want ANY export either. If I were to use this on my main panel, I would probably set up a small load - perhaps 100-500 watts that are in place up-stream from the CT's. That would be my buffer. I would probably also use a current activated switch to shut down the grid connection to the NHX if any reverse flow was detected.

The nice thing about this inverter - for me, is that it is big enough that I can power a lot of loads on the output, and I don't HAVE to use the export feature if I don't want to. It's appealing to use it, because I don't have to do a lot of rewiring and shifting things around.
Click to expand...
I do plan on installing a transfer switch on the outside of the building as the buried cable wouldn't be long enough. I guess I won't be able to utilize grid assist under large surge loads. Whatever I install will be a pair of inverters so it probably won't matter.
 
1201 said:
is it possible to have it work only on voltages and not SOC?
Click to expand...
Doesn't look like it. It has a disconnect voltage that you define in the battery setup, and you of course set up charging voltages. But the on grid and off grid EOD settings are percents, not voltages. Its not like the 6000XP that lets you tell it whether you want to use voltage or SOC.
 
CuriousJohn said:
Doesn't look like it. It has a disconnect voltage that you define in the battery setup, and you of course set up charging voltages. But the on grid and off grid EOD settings are percents, not voltages. Its not like the 6000XP that lets you tell it whether you want to use voltage or SOC.
Click to expand...
Thanks for that info 😢
 
So a question I have is whether the NHX will communicate with the 4 EG4 Lifepower4 batteries I have. Mine are the simple version with no display. Mine have never had the firmware updated to properly communicate. I'm assuming I may have to do that firmware update. Question is whether they will communicate with the NHX?
@Watts247 - Ian Roux - would you mind answering that?
 
CuriousJohn said:
Doesn't look like it. It has a disconnect voltage that you define in the battery setup, and you of course set up charging voltages. But the on grid and off grid EOD settings are percents, not voltages. Its not like the 6000XP that lets you tell it whether you want to use voltage or SOC.
Click to expand...
This is a no go for me. If export from battery/pv to offset loads cannot be adjusted with battery voltages, this inverter is just about useless for my wants.
 
Kornbread said:
This is a no go for me. If export from battery/pv to offset loads cannot be adjusted with battery voltages, this inverter is just about useless for my wants.
Click to expand...
maybe if the battery type is set to lead acid then it should allow voltage based control? @CuriousJohn
 
CuriousJohn said:
So a question I have is whether the NHX will communicate with the 4 EG4 Lifepower4 batteries I have. Mine are the simple version with no display. Mine have never had the firmware updated to properly communicate. I'm assuming I may have to do that firmware update. Question is whether they will communicate with the NHX?
@Watts247 - Ian Roux - would you mind answering that?
Click to expand...


The inveter uses Pylontech protocol. The lifepower4 batteries dont use that. But the lifepower battery hub does have that option. I just couldn’t get it to work in RS485. I didn’t fiddle with it long though.

So you may have some luck with the hub.
 
Gavin Stone said:
The inveter uses Pylontech protocol. The lifepower4 batteries dont use that. But the lifepower battery hub does have that option. I just couldn’t get it to work in RS485. I didn’t fiddle with it long though.

So you may have some luck with the hub.
Click to expand...
That is good to know. I'm certainly willing to buy the hub for what is it - $108 I think? That's worth it to have $5500 worth of batteries communicate with pretty much any inverter.
 
CuriousJohn said:
That is good to know. I'm certainly willing to buy the hub for what is it - $108 I think? That's worth it to have $5500 worth of batteries communicate with pretty much any inverter.
Click to expand...


Yeah they have a lot of different protocols on that hub. Plus it is great to keep an eye on your pack with. You can see all the cells in each battery.
 
Ian's response when asked if the nhx could talk to a jk bms, " ... 3) as long as JK can talk Pylontech protocol canbus should be fine. ... ".

Might that hub work with multiple jk bms?
 
Zwy said:
I do plan on installing a transfer switch on the outside of the building as the buried cable wouldn't be long enough. I guess I won't be able to utilize grid assist under large surge loads. Whatever I install will be a pair of inverters so it probably won't matter.
Click to expand...
Transfer switch IMNSHO is the *ONLY* way to go. In a perfect world I would have the meter feed a small panel with a 100-150A breaker to the backup side of a transfer switch, my stuff to the primary side. Feed the ATS to the panel. I make sure my output is sufficient to meet demand period, then the middle finger to all the interconnect instanity.
 
Not sure if it is being talked about elsewhere on the site - but the Vestwoods 8k at signature solar is obviously a 2nd try at selling the megarevo. Looks like they at least tweaked it to work with EG4 batteries in the firmware. I'd say its a safe bet that it is the same as Watts24's NHX 8k, but with the battery fix. Perhaps other tweaks too.
 
CuriousJohn said:
Not sure if it is being talked about elsewhere on the site - but the Vestwoods 8k at signature solar is obviously a 2nd try at selling the megarevo. Looks like they at least tweaked it to work with EG4 batteries in the firmware. I'd say its a safe bet that it is the same as Watts24's NHX 8k, but with the battery fix. Perhaps other tweaks too.
Click to expand...


The NHX is the newer generation of megarevo inverters. So it’ll have differences. The LCD display would be a large one
 
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