Rapid Shutdown (RSD) on the EG4 18Kpv

FYI I just connected my eg4 18kpv today with 2 arrays of only Tigo TS-4 A-2F and one array of mixed 6 panels running Tigo TS-4-A-2F and 4 running TS -4-A-O AND TO MY SURPRISE the inverter turned on the TS-4-A-2F on without the Tigo RSS Transmitter!! I have now removed the RSS Transmitter and coils and reboxed it for return/resale to whoever and my arrays are
happily pumping out plenty of power without ANY ADDED RSS Transmitter and the RSS button on the side of the 18kpv works
Great! one note i didnt expect was the optimizers to continue to pump out their voltage thru the mixed system of TS-4-A-2F
(the optimizers were in the middle of the string with TS-4-A-2F on each end of the string) so when i measured the string voltage back at the inverter prior to connection i got 3 v , 3 v and 140volts on the last MIXED string!! SUPRISE!! Anyway everything works fine and i have a TAP/CCA on order to satisfy the rapid shutdown
 
FYI I just connected my eg4 18kpv today with 2 arrays of only Tigo TS-4 A-2F and one array of mixed 6 panels running Tigo TS-4-A-2F and 4 running TS -4-A-O AND TO MY SURPRISE the inverter turned on the TS-4-A-2F on without the Tigo RSS Transmitter!! I have now removed the RSS Transmitter and coils and reboxed it for return/resale to whoever and my arrays are
happily pumping out plenty of power without ANY ADDED RSS Transmitter and the RSS button on the side of the 18kpv works
Great! one note i didnt expect was the optimizers to continue to pump out their voltage thru the mixed system of TS-4-A-2F
(the optimizers were in the middle of the string with TS-4-A-2F on each end of the string) so when i measured the string voltage back at the inverter prior to connection i got 3 v , 3 v and 140volts on the last MIXED string!! SUPRISE!! Anyway everything works fine and i have a TAP/CCA on order to satisfy the rapid shutdown
Correct, the 18kpv has the capability out of the box to send the "heartbeat" that the RSS transmitter does. The optimizers will work (as an optimizer only) until connected to a CCA. Once connected to a CCA, they add the RSD functionality. After they've been paired with the CCA, they will not produce power without the CCA/TAP active, because without the signal.. it will assume "RSD" has been activated. That said, the eg4electronics website has an RSD addendum to show you how to wire the CCA into the 18kpv, to eliminate dark start problems. Though, since you have a ton of the "RSS Transmitter" compatible panels, I suspect the dark start problem won't be a problem.
 
Not quite true.

* There is a device that Solar Edge sells that will completely turn off the RSD function of the Solar Edge Optimizers. (I think it is called the Solar Edge Key). However... if you need RSD you will be out of luck.

* Solar edge does sell a controller that works with the optimizer. If you remove power from the controller, the optimizers will initiate a rapid shutdown sequence. The only downside is that the controller requires 120V power supply... so you have to plug it into the output of the 18K to make it all work. (When the 18K does a Rapid shutdown the AC turns off which initiates a rapid shutdown of the optimizers. That works OK but it introduces a greater possibility of a dark start problem. Here is the dark start sequence:

The inverter is powering the load overnight (No Grid power).
The batteries get low enough that the inverter shuts down
The Solar Edge optimizers shut down.
In the morning the panels can't turn on to charge the batteries.

With the Tigo optimizers and associated CCA controller, the CCA can be powered from the +/- 12V power supply the 18Kpv offers. This power supply will remain on till the batteries shut down.... even if the batteries get low enough that the inverter shuts the AC down.
That sounds like a great way to power the Tigo CCA but my 18kpv doesn't put out ANY voltage on the 12+ and 12- lines. Is there something I have to turn on to make this happen?
 
That sounds like a great way to power the Tigo CCA but my 18kpv doesn't put out ANY voltage on the 12+ and 12- lines. Is there something I have to turn on to make this happen?
There is a setting that you need to enable for this to work. I can take a look at your system if you'd like and make sure that RSD has been enabled. Just send me your station name and S/N and I can take a look.
 
There is a setting that you need to enable for this to work. I can take a look at your system if you'd like and make sure that RSD has been enabled. Just send me your station name and S/N and I can take a look.
Many thanks to Jarrett for the timely help , Had to swap a couple of wires around on the main board and power is now present
 
Many thanks to Jarrett for the timely help , Had to swap a couple of wires around on the main board and power is now present
Yeah, we've had a few go out this way.

Luckily, it doesn't damage anything, and it just takes the two pigtail connectors being swapped.

Glad your RSD is working!!
 
Something to consider:

The most likely reason you'd run your batteries down to the point where your inverter were to shutoff, would be due to a grid outage.
If that is the case, the grid isn't going to resolve the "dark start" issue for you, until it returns. Thus, you may still want to consider some "dark start" options that don't involve the grid.

IMO: "dark start" solutions that involve "grid" in the sentence, aren't a solution. chicken and egg scenario.
for dark start, you could add a 12v car battery or other connected to a 120v inverter to supply a 120vac source to the inverter, unless the AC source has to be synch'd to the grid ...that is down???
 
for dark start, you could add a 12v car battery or other connected to a 120v inverter to supply a 120vac source to the inverter, unless the AC source has to be synch'd to the grid ...that is down???
Many inverters won't start from 120v input, they need 240v. specifically offgrid type inverters. (Though, some do, to be fair).
So this *may* work for some inverters. You'd want to test it, however.

But yes, there are a ton of ways to work around the dark start issue. The specific point I was trying to make is.. "dark start" implies there is no grid available. So any "dark start" plan that involves connecting to the grid in some way, isn't actually a dark start plan.

Not sure if I mentioned it in this thread or not, but.. my panels are connected to DC charge controllers. The "rapid shutdown" transmitter is powered from 12-24v dc. so, in my case.. in my case, I can take the transmitter to one of the follwing 12v sources

Primary option: powered by the 12v output of the inverter. If it's still up and running (not really a dark start)
Backups (actual dark start):
#1) Solar powered gate openers (I have 2, each uses 2 12v batteries)
#2) my portable ham radio setup (solar powered, and AGM batteries)
#3) 3 different vehicles with 12v sources

So in my case, I'd take the RSD transmitter, connect it to any of those sources, and the arrays would all wake up and start charging the batteries. When sufficient charge, inverter can start.
 
@FilterGuy

If I use the TS4-A-2F, And install them on the modules per requirements, do I need to do anything else besides place the PV wires into the PV inputs within the EG4 18KPV?
 
@FilterGuy

If I use the TS4-A-2F, And install them on the modules per requirements, do I need to do anything else besides place the PV wires into the PV inputs within the EG4 18KPV?
Nope, the 18Kpv has an internal transmitter that takes care of the rest.

Note: in some jurisdictions, the RSD initiator will need to be 'readily accessible' and that is often not where the inverter is. In this case, you can install an external initiator with wires to the inverter.
 
Back
Top