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Great comment, I was not implying that they are able to write software, they don't even know how to document changes. I was just recommending that they should document the firmware changes they get from the BMS OEM. And I spent hours with just a simple tool like the BMS_Tools because it...

Update on AC coupling IQ8's All single IQ8+ inverter testing was done without any PLC communications between the IQ8 and the IQ gateway, it was switched off. Here is a block diagram for the XW+ or XW Pro inverter: Look at the AC EMI filter on the backup load side where the micro-inverters would...

Could be same or newer firmware, Enphase said anything below ...2.61 would not AC couple and changing grid profiles would not make a difference. Enphase needs to increase micro inverter sales and fend off competition by Hoymiles and AP Systems. While successful IQ8 AC coupling may cut into sales...

Another recommendation for micro-grid backup storage: You do not need expensive LIF batteries for backup and you never run into the thermal risks that come with lithium. Lithium is very dangerous metal! It melts at 360 deg F and reacts with water to form semi-toxic LiHO lithium hydroxide and H...

It's all about incremental additional revenue to justify the insane PE of ENPH. Same with the cell modem requirement for commissioning.

Yes! Very exciting. And secure communications. Cautiously hopeful that the use of proprietary and closed protocols will soon come to end! But it all depends who is in control of authentication and who has authority to create the logins! IQ gateway: you need a token assigned by Enphase to...

You're on to an interesting behavior of IQ8 inverters. When I connect 14 IQ8's to XW-Pro off-grid, they start producing with a suitable grid profile but at a reduced rate, less than 50% of PV source. How would they know to produce less? Impedance checking? Hoymiles inverters produce up to PV...

All-in-one: EP Cube, QCELLS's QHome and soon Powerwall 3, Alpha-ESS stackable later this year Whole house backup, AC coupling: stacked Schneider XW Pro, FranklinWH

UL1741 SA is a subset of UL1741 SB. It only affects new installations in states that specifically require it, Hawaii, California, New York and New England states. IEEE 1547-2018 and/or the updated IEEE 1547.1-2020 are the standards. UL 1741xx is not the standard, it is the certification by an...

Just tried to AC couple the 14 IQ8's with AC coupling switched off in the XW-Pro. They still do not start producing power. Will try to test other grid profiles, but Enphase profiles are limited by region and I do no see a profile for "sunnyboy".

Remember this video by Tom Brennan: Sol-Ark Micro Inverters

Great response on the core issues! Here is a link how to perform active power control: OpenDTU-onBattery FOX-ESS offers a 11.4kW hybrid ESS inverter in the US for 2.2k, 13.5k for a 20kW battery plus the 11.4kW inverter plus 200A MID panel (very similar to Franklin WH aGate), and a buy 2 get 1...

CyboEnergy had gridforming micro inverters for several years. But not a combination grid-tied plus micro-grid forming like Enhase.

MID disconnect is required for connecting hybrid backup inverters to the grid. A MID disconnect device implemented as a relay has a fault-tolerance of 1. When it faults (stuck in the closed position) it creates islanding and there should be a 2nd level of protection: the hybrid inverter itself...

wheisenburg: Great setup with wireways! Very professional! You could also monitor the frequency and AC voltage for any signs of FW or VV or VW by the Schneider. You have a stacked dual Schneider XW setup, but I'm not sure the stack can handle more than 30 A max of PV power without significant...

For now, you have a point for choosing IQ7 over IQ8, but there are others on this forum who have problems lately with AC coupling of IQ7's too. It may depend on the firmware loaded. IQ7 and IQ8 inverters are or can be firmware upgraded to be compliant with IEEE 2030.5. These new standards...

No disagreement, just minor differences in interpreting semantics. Here is the misson statement of SunSpec: SunSpec Mission The alliance is supported by membership dues, now at $5k per year. So they cater to their corporate members and not homeowners or DIY installers or small commercial...

A common thread in backup systems which can successfully AC couple with IQ8's is the PV disconnect relay: IQ systems controller 1 (no relay) versus IQ system controller 2 (has 64 A PV relay) FrankinWH aGate (has a 64 A PV relay) CSI EP Cube (has 2 relay-controlled extension ports)...

Hoymiles inverters (HMS-700-2T) AC-couple flawlessly with Schneider XW-Pro inverters. Have a small 7 x 250W-panel off-grid system for the initial testing. Will expand it to 4.5 kW over the weekend and perform more in-depth testing. Finding lots of interesting details and differences between...

The new EG4-18k looks very promising, but we need more testing to see if it can deliver. We need to see if it has similar problems as the SolArk in certain applications: 1. AC coupling is disabled for now in off-grid mode ( according to the manual) this effectively means it is not working...

What would make sense would be an optional off-grid satellite internet connection, decoupled from local regional disasters. But we are not there yet!

The grid disconnect relay in the hybrid grid-tied inverter can ark if the inverters are stacked and the stacked power (either grid or backup) exceeds the break/carry current of the relay in a single inverter. Parallel stacked relays are limited by the break/make/carry limits of a single relay...

AC Coupling Testing: The XW 6848 can inject up to 140 A into the battery. With an approximate 5:1 DC/AC ratio, that gives us a max AC of about 28 A. Any PV AC current higher than that is not possible with no backup loads. In reality, depending on the battery config and SOC it will be a lot less...

User access: Enphase IQ gateway no! European users are demanding it! Modicon now Schneider SE developed ModBus in 1979. Schneider XW Inverters: Yes via open ModBus and proprietary XANBUS Hoymiles DTU-Pro S: Yes via ModBus RTU and/or DRM (RS 485) for Australia/New Zealand, required for grid...

Most EV's don't have the V2L inverter, Tesla EV's don't have it, and on newer EV's it is an option only available on the higher end trims. There is also a 3.6KW limit. There are some workarounds available EV Extend.

I am a certified FranklinWH system designer and installer, but only to fully understand what these systems can do. They have IQ8 installations and AC coupling is a must. But they do not use frequency-watt shifting, only PV hard on/off. I think they need to do this so they can use the main...

Excellent customer service by Hoymiles. Let us know how it will work when voltage drops that low.

zanydroid: Glad you are mentioning Growatt, MPP. There are quite a few other backup/hybrid inverters available. But only a few can do FW power curtailment well, Sol-Ark is one of them. The AGM batteries come from different vendors and you have to follow the data spec sheet for DoD. They cannot...

You really know the issues! VV would be better called VvAr or VW like you said. Non-Intrusive passive grid control needs to be replaced with intrusive active control, especially if we get more DER micro-generators and EV's. It's coming with UL1741SB and controls like IEEE 1815 DNP3 IEEE...

An IQ combiner panel is not required, but a non-Enphase AC combiner panel must be able to mechanically lock down the feedback PV breakers. IQ Combiner Panel Differences Here is an interesting option that gives you both: DIN breaker panel with an integrated LoTo switch! AC Combiner with LoTo...