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Since my inverter is not an EG4, I am not counting on battery comms to work, or to be reliable enough to depend on for RSD. If the inverter has failed, you still want the battery to turn off under RSD. If you depend on battery comms, then you depend on the inverter in the path. This would be...

MOSFETs are usually not the CAUSE of failure, just the victims of it. You can replace them all, and the drivers, and the root issue might remain to bite you again. For example, MOSFET gate drives often have zener diode protection and if that zener is faulty, everything may seem to work fine...

Can you give the NEC code reference number for this requirement? Then a common neutral point violates this requirement. At the common neutral point, neutral currents will combine but the line1 and line2 wires won't. So the current doesn't travel together any more. The neutral wire from the...

Very helpful. There is another device on the panels that stays energized when receiving a signal. RSD stops that signal, a timeout occurs, the connection is opened at the array. The array wiring is still hot, but not the feed from it to the inverter. I was previously unaware of this...

Which ones represent suggestions you personally made to EG4? I'm trying to verify this claim that you, personally, have caused firmware updates to occur on the EG4 equipment. If the claimed benefit of EG4 is that an individual can suggest changes that get incorporated, that's a nice feature...

People casually refer to wall wart DC power supplies as "transformers". Just wanted to be sure that confusion didn't occur. The trim signal had to be AC to work. Mike C.

Well, it happened again. Almost exactly 192 hours since the last time, the inverter shut down the backup panel. The backup panel went dark for about 30 seconds, then came back. Last time, a battery comm error was reported, but this time no error was logged by Solarman. I'll have to check the...

I presume you mean watts. 1.8 KWH per day when operating on battery based on the above numbers. Mike C.

Can the clamp meter give you the AC current out GRID and LOAD connections? The power has to be going SOMEWHERE so it is flowing out the AC connections or is becoming waste heat, but 600 watts waste heat would be a huge problem. Mike C.

Uh, you sure about the specs on this? Consider the energy density: 750 KWH per 3000 lbs is 0.25 KWH per lbs. The EG4 indoor wall mount battery: 14.3 KWH per 282 lbs is 0.05 KWH per lbs. Your flooded lead acid battery is *** 5 times *** the energy density of an LFP pack? Bogometer went off...

Your sure this only goes to 52.5 volts? That is 2.19 volts/cell for lead acid which isn't nearly high enough to charge a 48 volt lead acid battery. You need around 56.4 volts (2.35 volts/cell) for that to work, which makes a 16S LFP pack just about right. Have you run the generator and seen...

I'm a solar rookie (but a highly experienced electrical engineer). I've designed (not installed) a system for my parents home in Sarasota, FL based on the EG4 18KPV unit and would like to tap into the combined experience and wisdom of the group to review it for function and regulatory issues...

Does this mean no agreement with the utility, that is no permission to back feed the grid? What systems call "zero export"? If so, there are some subtle complexities with that. It turns out the inverters can react to load changes fast enough to absolutely assure not back feeding occurs. This...

I wonder about that, too. I think this is a gray area which no one should ask about lest we get more rules and limitations. It is pretty clear that if units are locked to the version of software they certified with, we'd have a lot of bugs that wouldn't get fixed. Mike C.

Are you saying the 18KPV won't pass battery data to the app if the battery brand is not EG4 also? You put a brand filter on the data? Not sure this is compelling since the Ruixu don't have some display with firmware you interact with. One hopes the firmware inside them rarely needs updating...

And they don't work that well, especially in the cold. PV panels heating water electrically will work better, IMO. Is the strategy to store heat during a sunny day to melt snow on a cloudy one? Or do you only intend to melt snow when sunny? In my mind, what you want is a large insulated...

There isn't that much LFP capacity between 55.5 and 56.2 volts, maybe like 3% or so. So if you adjust it to 55.5 volts (to give you some margin and drift tolerance), then it should charge your batteries pretty well. Not going to max voltage can also make your cells last a bit longer. That...