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We're currently doing a multitude of edge-case testing for some of these scenarios that people are looking for. We have some videos in the works as well to demonstrate the results of our testing, so stay tuned for that! To answer your questions with what I know, 1. AC Coupling works just fine...

As the title says, the EG4 18kPV is now CEC listed! This is another big step in keeping up with codes. While a fair number of DIYers don't have to worry about super strict regulation, there are plenty of people in the states that do, so we're happy to announce that we're doing our due...

The battery connections are part of a paralleled bus, so you can use one or two cables for each polarity. The choice comes down to the gauge of wire that you're using. The manual recommends 4/0 AWG or larger for a single 10ft run, but I've found that two runs of 2/0 AWG is a bit easier to move...

The EG4 LiFePower4 batteries now have an extended warranty period of 10 years when used with the 18kPV. There are many areas with incentives (or law) that require a 10 year warranty period for equipment. There will be more compliance developments in the near future to help prevent folks from...

I know Eddie answered, but yes it does support 50hz. It will autodetect based on grid frequency. The spec sheet will be modified to clear up confusion!

Those who planned on using the mobile firmware (what is now the "Disabled" setting) still need to contact their distributor for guidance on reinstalling the screw (for warranty purposes and the like). Since the primary use case for this inverter still tends to be in stationary settings, this...

The 2023 code pretty much confirms this since it is reworded to say metal clad/metal raceway/underground don't require Arc fault protection IF not installed in or on buildings or detached structures. Doesn't mean 2020's version can't be interpreted to mean either or by an AHJ or inspector but...

The 18kPV does have the SunSpec transmitter within the unit, so utilizing the RSD or PV Disconnect will open the circuit and reduce the Tigo MLPEs voltage to safe levels. If you use the Tigo Optimizer line, you'd need the TAP/CCA to make use of all the features but the Fire Safety line is plug...

Not sure why the manual wasn't changed to reflect the listing, but I confirmed that the Growatt SC4880 currently available is the MPV version which is 250VDC maximum. I'll see what I can do about getting that fixed.

There wouldn't be any reason for Markus to try leading you astray, we all want your system to work flawlessly at the end of the day. The CTs are labeled as CT1 and CT2 as they input to different pins on the inverter, so it could cause problems if L1 is receiving the data from L2 and vice versa...

I wasn't able to replicate your situation with my setup, so I asked the Signature Solar tech support team to reach out to you for contact so they can look into this. They'll be able to resolve the issues you're facing in a much more timely manner than myself, but we can revisit this thread and...

I would just like to add that you'll see most quality power supply units follow the Industry Standardized Hold-up Time set by Intel for computer systems. While I'm sure this leniency varies by application, if someone's computer can tolerate the 10ms transfer time then I'm sure their fridge and...

The inclusion of a manual transfer switch is helpful in the event that your solar system needs to be worked on (maintenance, expansion, etc.) but you don't want to lose power to the main load panel since you can just bypass the ESS with grid power. It's not a necessity, but that extra...

You don't need anything between your solar and the 18kPV's MPPTs to work, just as long as your PV strings are series'd to a high enough voltage to start the MPPT. Depending on where your panels are mounted, you may need MLPEs for 690.12 compliance but that's where the transmitter can help make...

Since the inverter is designed for off-grid usage, most people won't have utility as a hookup anyways so the AC input's default setting isn't particularly telling. To my understanding, the only difference between Appliance and UPS modes are the transfer times (20ms vs 10ms) and the acceptable...

I would definitely recommend reaching out to SS's technical support staff to resolve the issues you're experiencing. That behavior is definitely peculiar, but it isn't something I've experienced or heard about at any length so I wouldn't be a good judge...

The relays built into the 18kPV is the Churod Char-112A200. They have a make/break of 50A, but can carry 200A and have a max break of 220A.

The secondary inverter needs to be in "AGM" mode on the battery setting to properly coordinate with the master inverter for communication, even if you're using lithium batteries. Try that first, and see if it helps! I don't know off the top of my head whether or not the display should still read...

They do not come with any means to satisfy ground fault protection built in. I didn't copy word for word, but yes that is a new term. I may have worded that a little poorly actually, because "detached structures, whose sole purpose is to support/contain PV equipment" is exempt like ground...

It should accomplish the same goal, but whether or not it's allowed is likely up to your local AHJ. Interlocks are a pretty common way to implement a transfer from what I've seen. Not sure how easy/hard that is to get through an inspection though.

The 20ms transfer time is the typical (could be lower) time in appliance mode on the 6500EX. There is a typical 10ms transfer time when the inverter's setting 03 is in UPS mode. This is the norm for most systems, as anything requiring a lower transfer time is generally higher grade electronic...

What BTU mini split are you considering? If you're wanting to use EG4's 12kBTU hybrid, it'll need a 120v input from AC (Inverter/Grid/Generator) and/or 90-380V of DC (Solar). You can use a 48v, 24v or 12v battery, it just needs to be whatever matches the inverter that you choose to go with. The...

I believe they will work as optimizers out of the box, but the CCA/TAP are required for monitoring and RSD function. They may work off SunSpec protocol if they don't have the CCA/TAP but I couldn't find anything about it after a quick glance on the datasheet. Yes, but the PV line to the...

If you're using the 6500EX inverter it won't be able to fit 2 AWG wire into the MPPT terminals, but also it shouldn't need wire that large for a solar array since arrays generally have pretty low amperage. Additionally, there can be conflicts if the array's strings are combined and split to...

I'd have to check about adding SunSpec verbiage in since it is implied but not explicitly stated outside of just saying "built-in RSD transmitter". I don't think the 18kPV's manual is the place to add comments on how the Tigo systems are supposed to be configured though, otherwise it could...

Ah, that model is one of the two AC-only mini splits from EG4, not sure if the Mr. Cool would have a DC connector either. The only way to power that split would be from the output of an inverter or grid, whichever you're using as the primary AC source. You could still power it via solar using an...

Since you mentioned that you have a NG bond (and it sounds like it is from grid source), you may want to change setting 34 to enable so that you have you ac-in and ac-out neutrals connected. It is a bit safer, and has alleviated some problems that pop up like extra loud transformer buzzing. Good...

I'm not super familiar with the ins and outs of SolarEdge power optimizers, but from what I've heard there are a number of them that only work properly with SE inverters and require an additional device to be unlocked for use with non-SE inverters. If that's the case, you won't be able to wire...