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Conext XW+ charging issue
#1
Hi DIYers,

I have a message into Schneider about this issue, but have yet to receive a response. Wondering if anyone here might have an answer.

I have a 6848 XW+ connected to 14S7P Leaf module battery. I have Grid Support enabled and the Grid Support & Recharge voltage setting at 50 volts so that when battery gets down to that level it's supposed to go into charge mode. Inverter goes into AC Pass Through 0.5 volts above this setting and only a few watts is drawn from battery at this point thus it would take days for it to reach the 50 volt level. I have to manually change the Recharge setting to 50.5 volts to get charge cycle to start. On a seemingly related setting:
 

Grid Voltage Support is nowhere to be found in the manual. Not sure what this is supposed to do. I have tried several other tweaks involving load shed and sell to grid with no resolution. Any ideas on these issues would be appreciated. Thanks
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#2
I have had a few email conversations with Schneider support. It takes a couple days to get the first response. But once the email thread is started, they have always replied without 24 hours. A couple times it was less than 1 hour.


Do you have PV? AC or DC coupled?

Check PLS or peak load shaving.

For grid voltage support, search for the words in a different order. "Grid support volt" shows up on the manual for the XW pro.

On page 77, it also shows that you set grid support voltage above the recharge voltage. And notes that it will add 0.5 volts to your recharge setting for whatever reason...

Have you tried raising your grid support voltage?
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#3
(07-03-2020, 03:33 AM)400bird Wrote: I have had a few email conversations with Schneider support. It takes a couple days to get the first response. But once the email thread is started, they have always replied without 24 hours. A couple times it was less than 1 hour.


Do you have PV? AC or DC coupled?

Check PLS or peak load shaving.

For grid voltage support, search for the words in a different order. "Grid support volt" shows up on the manual for the XW pro.

On page 77, it also shows that you set grid support voltage above the recharge voltage. And notes that it will add 0.5 volts to your recharge setting for whatever reason...

Have you tried raising your grid support voltage?
I'm AC coupled. 8KW into main panel and 2KW into critical load panel. I have tried the load shave settings and setting the above Grid Voltage Support to enable with no difference. I will try setting the Grid Support Voltage a little higher than the Recharge Voltage and see what happens. My manual only has 72 pages. Huh Thanks for the help.
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#4
That's quite to PV system, nice!

Is your Conext between the main and critical loads panel? Using the internal transfer/disconnect switch?

I think you need the "owners guide" it is 148 pages long and goes into more detail about configuration and grid support settings.

This note (page 74) is of interest: "In grid support mode, the Conext XW+ should not draw a large amount
of current from the grid." That sounds to me like the symptom you have now. You want it to charge from the grid? It's not going to. Remember, the XW can't see your main panel or the PV connected to it, so that PV looks like the grid.

With the way I believe you have your system set up, I think all the XW is going to do is shoot for 0 kw passing through the unit. If the 2kw of PV in the critical load panel exceeds the demand from the critical loads panel it should charge. If it has battery capacity available, it will support the loads in your critical loads panel when load exceeds the PV capacity.
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#5
(07-04-2020, 04:48 PM)400bird Wrote: That's quite to PV system, nice!

Is your Conext between the main and critical loads panel? Using the internal transfer/disconnect switch?

I think you need the "owners guide" it is 148 pages long and goes into more detail about configuration and grid support settings.

This note (page 74) is of interest: "In grid support mode, the Conext XW+ should not draw a large amount
of current from the grid." That sounds to me like the symptom you have now. You want it to charge from the grid? It's not going to. Remember, the XW can't see your main panel or the PV connected to it, so that PV looks like the grid.

With the way I believe you have your system set up, I think all the XW is going to do is shoot for 0 kw passing through the unit. If the 2kw of PV in the critical load panel exceeds the demand from the critical loads panel it should charge. If it has battery capacity available, it will support the loads in your critical loads panel when load exceeds the PV capacity.
Yes, @400bird XW+ is between main and critical load. I have the Rev. G hard copy of owners guide and it's broken out into chapters like 1-2, 1-3, etc. Probably 148 pages. However, the Rev. I of owners guide in PDF is only 72 pages. Undecided

I'm charging from grid operating in grid support mode. Doesn't matter where the AC comes from when net metering taken into account. The main south PV array has Enphase M250 microinverters, 32 SW275 panels and is monitored via Enphase's Envoy. While the East/West array has the IQ7 inverters (incompatible with Envoy), 7 SW290 panels. This string AC coupled into critical load panel. IQ7's are better at handling frequency shift power curtailment in the event of an outage. But there's never been an outage here for more than a few seconds in the 7 years we've lived here. So my main purpose is mostly self consumption, running off of battery in the evening. No reason to put XW+ in Sell mode as all the excess PV already goes to grid anyway. I usually make $500+ a year from net metering plus no electric bill. If power outages were an issue, I do have a natural gas powered generator connected to AC2 input. Going to test that out today to see if XW+ likes the power quality. I monitor all this energy flow with Emporia Vue.

So I will see later this afternoon if setting Grid Support Volts at 50.1 volts while Recharge is at 50 volts gets the charge cycle going. Thanks again for your help.
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#6
So it turns out XW+ still goes from Grid Support to AC Pass Through 0.5 volts above Recharge Voltage of 50 volts with Grid Support volts set at 50.1. Also my generator test failed as XW+ did not qualify power after 10 minutes of running generator. Voltage and frequency within parameters set. So another issue to figure out down the road.
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#7
When it switches to AC pass through, which way is current flowing? Is the solar on the critical loads panel producing excess current over the load?

I hope Schneider gets back to you soon and can help you out!
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#8
(07-07-2020, 04:40 AM)400bird Wrote: When it switches to AC pass through, which way is current flowing? Is the solar on the critical loads panel producing excess current over the load?

I hope Schneider gets back to you soon and can help you out!
Makes no difference on the current flow. This last cycle it happened at night. No AC from solar. I am changing out my ComBox to a Gateway and then Schneider should be able to log into system remotely to see what's going on. There has to be other people experiencing the same issue.
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#9
I finally got a response from Schneider:

Hello John,

I attach the XW+ users guide where you can see in page 3-26 all the grid support modes and in figure 3-6 how the different features can work.

You have to put Grid support volts always upper than recharge volts (at least 0,5VDC my recomendation test 1 or 2 VDC it has an 2VDC hysteresys as maximum) because this feature prioritize charging batteries from the MPPTs and just in case the AC grid drops or you limit the ACgrid input ( with AC Amps in AC settings) and the loads are bigger than this limit, the DC batterie value will drop until recharge volts. and just only in this case the batteries will do a complete charge cycle. This is because you prioritize PV panels instead of grid .

Depending on your battery capacity and you loads and pv panels but my recommendation is grid support around 50VDC and recharge volts no less than 48-49VDC. But you can play with depending on your needs.

On the web site you can also find some recommended configurations and their explanations too.

https://solar.schneider-electric.com/pro...-inverter/

inside of technical publications : load shedding and enhanced support modes.

Regards
[b]Iván Domínguez | Schneider Electric | Solar Technical Support
[/b]


And my response:

Thanks, Ivan, for your response. My solar is AC coupled. I have 8KW coupled into main panel and 2KW coupled into critical load panel so no MPPT's. I have tried playing around with all the Recharge Voltage and Grid Support settings, load shaving, disconnecting solar, etc. The problem is always the same. Inverter exits Grid Support 1/2 volt above Recharge Voltage setting and goes into AC Pass Through as if it's in Load Shave mode. There's no documentation that I can find about this behavior either in the manual or online FAQ's. If I leave it in AC Pass Through, battery charge remains about 1/2 volt above Recharge Voltage setting basically forever requiring me to manually start charge cycle. It appears there's no combination of settings that will allow inverter to stay in Grid Support mode until battery depleted down to Recharge Voltage setting. And there is no setting for limiting the AC input amps other than in Load Shave mode which is supposed to exit to AC Pass Through 1/2 volt above Recharge setting. For self-consumption on an AC coupled system, it would seem that there should be settings to enable grid support all the way down to Recharge voltage. Thanks.

The bottom line is, I think I'll have to wait for the Gateway to show up and then utilize the CAN bus port to have my Watchmon control when to charge battery.
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#10
Well, that response from Schneider was less helpful. Hopefully they respond quickly. With more info that applies to your actual set up, not DC coupled.

Once you switch to the gateway I believe you could add a RS485 energy meter at the main panel. The Conext (in grid support mode) should then work to keep this meter close to 0kw and charge when excess solar from the main arrays would otherwise go back to the grid.

The energy meter seems more desirable that just recharging from the grid whenever the battery runs low. You won't be paying for the juice to change the battery, the battery would charge from both arrays based on your entire production and energy use.
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