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Actually, there is arcing! You need precise relay timing to hit the AC zero-crossing. Occurred with stacked Schneider XW inverters in the past, that's why they developed and recommend the BSC 2200 MID panel with a 200A MID relay for stacking inverters. We would need PV control logic with AC...

Outback inverters like Skybox and Radian have been long-time favorites for reliable AC coupling. Are there successful AC-coupled systems with IQ8's and Outback hybrid inverters? Since you have the IQ7's you may have an older version firmware in the IQ gateway. IQ8's require an IQ gateway...

I thought so too. But when the grid-tied ESS inverter with full PV production and no load other than backfeed into the grid suddenly gets disconnected from the grid, the PV current needs a place to go. Inverter raises the frequency, beyond 62.5 Hz and the IQ8's shut down for the rest of the day...

Your right on, if you need a 12 kW backup inverter like Sola-Ark (up to 15 kW), Lux Power or EG4-18kvp and if your grid and backup lines are close to the main panel, this will be sufficient. You have losses for grid-tied operation in the lines from the main panel to the inverter back into the...

Anywhere from $800 (Fox ESS), $1600 for Franklin aGate, $2000 for Enphase IQ System controller to $3200 (Schneider SE BCS). But here is the catch: you cannot mix and match MID panels! You need to buy the whole package. Would like to see a generic MID panel with open MID and PCS control standards.

Good feedback: Enphase is in control of the profile for IQ inverters, not Schneider. I do not think it is Schneider's responsibility to find a grid profile that works with Enphase. In my view, it should work with all profiles utilities allow in a specific regions. All they need to do is pass...

We are all trying to AC couple IQ7's and IQ8's directly with Schneider XW Pro's. XW8' can be AC coupled (no FV, VV, VVar power curtailment) with FranklinWH and with SolArk by using a PV disconnect relay, the built-in PV relay in the FranklinWH aGate or the Gen relay in the Sol-Ark 15k. The...

Some XW Pro's are fairly quiet except for the 60 Hz hum under full load, others are very noisy with annoying high-pitch frequencies. You can check for loose sheet metal parts that separate the different component sections. Have one XW Pro I'm trying to calm down, have 2 XW's that are fairly...

Yes! That's why I won't consider the Schneider BCS, you can do this with an external contactor. But it is recommended for stacking more than 2 XW Pro's, otherwise you'll have relay arcing and stucked MID relays. The 200A rated relays in Sol-Ark and Lux Power are rated for 200A carry, not...

FWIW, had email exchange with SunGoldPower about a year ago on the advertised AC coupling feature for the UL 1741 IP6048 6kW inverter. They told me that they are not using any active power curtailment like FW, VV or VVar when in off-grid mode. The inverter has a combined generator/AC load port...

goldserve: #192 is about AC coupling of IQ8's with Schneider XW 6848 inverters or non-Enphase MID controllers/inverters in general, and the use of an additional PV disconnect relay. 1) EMI or other PLC device Interference with Enphase PLC have long been known and have been successfully...

Sunny Island: That would be a great test, having an inverter where the FW shift up ramp can be specified, especially the end point and a ramp slope or gradient over time.

You have a nice setup with the wireway! Very professional! I have just started to add a wireway above and below my panels in the mechanical room. I was close to selecting Enphase as a backup solution and retire my two 12 year old XW's, setup as a UPS. After I went through all the Enphase...

Exactly! The XW-Pro has a built-in auxiliary output port that can be triggered by a battery voltage at a defined level. This is exactly the approach that works in Franklin WH, EP Cube and other inverters. When Sol-Ark AC generator is tied to SOC, the relay will open and disconnect the PV array...

Enphase just came out with their new IQ system controller 3 and the 5P battery. No more Zigbee and 250' feet max CAN bus wiring. But incompatible with all prior gen 1 and gen 2 IQ system controllers and batteries. Enphase will have a USB to CAN bus adapter for the IQ gateways by end of this...

Solar Enthusiast: Submitting a micro-inverter or hybrid inverter to UL testing with a specific firmware version required to pass testing for a specific standard is one thing, deploying a different firmware version in a region that does not require it is something else. Schneider, Outback and all...

You are absolutely right!

Interesting list and interesting snapshot why the specific Tripower SMA inverter was rejected. There are inverters that are SB compliant but do not support SA. Are they acceptable? All Y's in the compliance columns would be a safe bet for an inverter and a Y in the battery column would be best...

You're correct, but wouldn't the breaker open first or would the SSR fail first if sized correctly? How about zero-cross SSR's? SSR Protection We do not need the switching speed of a UPS for the PV backup, so simple relays would work. For daily operations in an off-grid scenario, individual PV...

I don't know any successful IQ8 AC coupling with FW power curtailment. IQ 8's can be AC coupled with FW off, constant 60 Hz, and using the generator relay for PV on/off. But then you loose the generator port for additional gas powered backup. I know an installer in Canada who got IQ8's to work...

Would like to do this, but there are no controls in InsightLocal and XW-Pro firmware to do this, or I don't know where to find them. IQ7's are much faster than IQ8's responding with a ramp down to a raise in frequency.

Why am I here? I want stackable inverters capable of AC coupling hat can be stacked for a whole house 200A full backup system. I would neither design nor build a single 400A backup system from stacked inverters that have 50A make/break rated relays, others on this thread were asking if it would...

Enphase Support: Enphase support is great! They replaced every micro inverter in the past that failed - over 50% !! - with a better compatible one. You can submit a ticket and get an answer on most questions in a day or so. Or you can get phone support directly. The courses are not bad, not...

Every home is different and the priorities for backup-loads and non-backup loads are different. If the main panel is good, you're right. An MPU upgrade is expensive. The IQ system controller has no pre-MID feed-through for non-backup loads - unlike Powerwall or FranklinWH - so all your loads...

This why I'm still with Enphase and their micro-inverters. The have replaced every failed one in the past 12 years, and I had lots of them fail. Heat is the biggest enemy for the capacitor electrolyte. Doing it differently with new IQ8+': use them at reduced power, 250W to see if they last longer.

Found this in an earlier document on AC coupling with XW inverters: "Some legacy implementations of antiislanding protection on PV inverters use a grid impedance check as a mechanism to detect a failed grid. Battery inverters typically have higher output impedance compared to the grid, and this...

Interesting question and helpful link. Enphase: When I connect 2-3 IQ8+'s to an XW-Pro, they start producing power in off-grid mode after 5 minutes. When I connect a live array of 14 IQ8+'s they never start producing, independent of the PV power available. There is no measurable frequency shift...

Changing profiles is something only the installer should be allowed to do in a controlled setup. Allowing it from the installer website could make it vulnerable to attacks or hacking. Put in a ticket to Enphase support and ask them for IQ8 AC coupling support or names of profiles that work with...

Would like to know how Lux Power or EG4-18kvp can be AC coupled with IQ8's and handle on-grid to off-grid transition. - FW enabled or disabled ? - connected to generator input or load side ? - wait for full PV production, switch all loads off and see how fast the IQ8's can be shut down without...

The IQ gateway has no batteries and lasts only 1/2 sec when power is turned off or drops below 60V AC, but it could possibly detect a power fault even if it stays on. The IQ gateway is the only "port" that can communicate via PLC with the IQ 8's. Here is something you could try: - Disconnect...