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Check out my latest findings. I'm getting closer to the PLC communication problems. AC Coupling a singe IQ8+ with Schneider XW Pro

Not sure what you are implying. Existing AC coupled inverters behind the MID relay are grand-fathered in and can stay and don't need to be compliant with new rules. New AC coupled inverters installed at the time of the MID device installation or afterwards need to comply with the POCO...

The reason is the total inverter output power in backup mode. The max inverter limit - 3.84 * 4 = 15.4 kw for 4 Enphase 10 T units - determines the max breaker size for a single load, NEC rules for backup systems. A lot of Enphase users trip up on this limitation. You do have similar limitations...

Off-Grid Testing with Grid Profile: IEEE 1547 2018 for IQ8's Changed grid profile back to IEEE 1547 2018. Array of 14 IQ8's starting after 4 minutes to perform anti-islanding checking, consuming about 0.6 W total, quite different from the Outback Radian profile. Then they come online but produce...

Correct, there are no rules and regulations how the off-grid inverter has to perform in an off-grid micro-grid config. I do not know any ESS inverter that has a configurable off-grid AC coupling profile, separate from the grid-tied profile. Too complicated, why detect the change in frequency if...

Case (1): No loads and Case(2): 1.2 kW resistive load, no difference in AC coupling. Enough battery charging reserve (80% SOC) to prevent any type of power curtailment, frequency constant at 60 Hz. Trying to develop a good incremental test plan, that's why this setup is a totally separate system...

https://diysolarforum.com/members/imanidiotpleasebepatient.72060/: Right On! Enphase is a supporter of the SunSpec alliance, but not a single Enphase product has been certified! Just marketing hype and locking in a customer to Enphase only backup. Just started testing Hoymiles HMS-2000...

One more subtle way for Enphase to sell more batteries. You cought it, many will miss it and buy another 3T. Cheers!

Newer airplanes all "fly-by-wire" with lots of redundancy. However, a few went down!

Have access to a Powerwall 2 gateway (MID panel) and it does not have a PV relay! FranklinWH has a PV relay and does not perform any other UL 1741 SA type controls in backup mode, works with IQ8 inverters! Just started testing a Hoymiles HMS-2000 micro-inverter which has direct open-standard...

Yes it is expensive, if you buy it from Enphase who sources a custom 64A filter from Astrodyne TDI. It is basically an improved $100 60A filter made for Enphase. A 60A single stage PLC Astrodyne directional filter costs about $100 and you can get a dual-stage directional 80A Astrodyne filter for...

Occasionally, I have IQ8's not reporting or producing less then neighboring inverters on same model panels with no difference in solar irradiance. Sometimes, the reduction in production corrects itself after 2-3 days, sometimes I remove the inverter, take it offline, test it and re-install it...

Sorry, it's a typo, SolaX is correct and you have the right link. I was surprised to learn that QCELLS Q.Home OEM's the Q.HOME CORE H3S/H7S ESS from SolaX. Looks like there will be a few more SolaX ESS systems in the US, like Emporia Energy SolaX.

wheisenburg: Yes, you would need to move the IQ gateway power supply, it is also required in Enphase IQ8/IQ system controller 2 installations to maintain power to the gateway if the PV relay opens. If you use a separate IQ gateway breaker on the load bus side, then PLC needs to extend across the...

Correct, HV batteries yield higher efficiency, LV batteries are more safe. That's why Hoymiles has the HV and LV line of inverters, the US split-phase HYS-LV-USG1 is a 48V LV inverter.

Of course, but when there is low solar irradiation and no grid power, you need some other form of backup. And a generator with a 48VDC output has the highest overall efficiency to charge the backup battery, and you do not even need an inverter generator for this.

Great that you could commission this without a cell modem. When you check the Enphase forum, you get contradicting answers on the cell modem requirement. What is the "Envoy" or IQ gateway model number and what firmware version is installed?

When Enphase IQ8s or IQ7's are connected to the IQ system controller and the MID relay is closed, they are directly connected to the grid. They need to be compliant with the grid connect rules IEEE 1547-2018 and IEEE 1547.1-2020 in these states: New York, Pennsylvania (PPL), New England states...

XW Pro 100A? Is this the line diagram for the setup of your system? Is it a full off-grid system or will there be a grid connect? If it is fully off-grid, there is no need for the MID disconnect, all DER power can be connected to the IQ controller internal 200A bus bar, up to 200A * 1.2 = 240A...

Performed a test with a 12 IQ8+ sub-array and grid profile "IEEE 1547 2018" late Wednesday with only 80W of solar. AC coupling started, but I noticed the often reported flicker - small variations in XW voltage - where the XW-Pro oscillates between charging and idle. There wasn't enough PV power...

You're correct, When there is no load on the backup load side, all PV power generated needs to have a sink for the current. The PV size cannot exceed the max charging power. Although some inverters suggest a PV ratio of >1 to 1, it's best practice to limit PV power to the max charge power or...

Single module Hoymiles micro-inverter HMS-2000 (4 MPPT 2000W) is working AC coupled with Schneider XW+ 5548. Will present results later and am working on ModBus direct power control. Hoymiles is committed to open standards and listed in SunSpec registry. HMS-2000 is UL 1741 SB certified and SB...

FW, VF and VV does not require PLC at all! Otherwise it would not be allowed by utilities. UL 1741 SA is done passively by the microinverter to monitor grid voltage, amperage, phase and impedance to adjust power production and provide reliable anti-islanding. Enphase uses PLC carrier...

Just finished my 1st round of testing AC coupling of a single IQ8+ with Schneider XW Pro 6848, see testing with XW + inverter, no difference. Testing XW + Inverter and AC coupling - IQ gateway is not required - i.e. powered off - for the IQ8+ to lock on to the grid or micro-off-grid to produce...

Part #2: IQ8+ AC Coupled to XW Pro 6848: Schneider XW Pro 6848: Firmware 2.04.00bn29 IQ Gateway: Software 7.3.120 IQ8+: (4 total) Firmware 521-00005-r05-v02.48.01 Grid Profile: IEEE 1547-2015 (Colorado default) PV Amp...

If the system is primarily grid-tied, efficiency is not important because the backup inverter is idle. If TOU management is required, only a small amount of energy is diverted via the backup inverter for a few hours per day. If the grid is down, it's only for a few hours up to a few days. If...

I looked at the pdf document and I have documents for top-of-the-line 200A make/break MID relays! It has a max switching current of 220A, but no documentation how many switching cycles at 220A! There is no 220A rated make or break current for the contacts! Look at the contact rating: 50A make...

Just finished 1st round of testing AC coupling of a single IQ8+ inverter with Schneider XW Pro 6848. Works just fine! XW Pro 6848 - AC coupled with singe IQ8+

Let's look at it from a different angle: XW Pro is rated at 6.8 kW. One battery pack could be 2 kWh but could sink 200A, or another battery pack could be 20 kWh but sink only 50A. Let's assume for now, that the battery pack is sized above the XW Pro max charge rating of 140A, a typical battery...

Grounding/Safety First for Linemen 1st pic shows what protects linemen in an islanding scenario. Does this mean you can inject whatever your inverter can produce into an island?