5kva MPII ground relay test failure during LS, not when syncing

He’s unit is May 2019. So it’s older then. I sometimes forget the info is actually in the manual… :slight_smile:

So back to, connect 2 wires inside the inverter:
Wire 1: AC_out1 N
Wire 2: AC_out1 E
Both are then connected to a circuit breaker.

Baby steps … sorry if that is annoying, but trust me, I’m gatvol of freaking sparks and smoke.

EDIT: And as I have learned, one person’s interpretation of words is another person f…up.

This one posted earlier. It lists the hardware and explains how the test is done. While islanded it continuously tests that it is closed. Before reconnecting to the grid, it tests that it’s open. The test is always done (regardless of the grid code). There is an NZ/Australia code for common-neutral installs that bypasses it, but of course that would not be legal.

Two wires. One connected to the AC-out neutral. The second to the AC-out earth (or any other earth, but this one should be closest I would expect. Connect them to a suitable switch. If you are like me, you have some breakers lying around. Just let the thing dangle out the bottom of the inverter.

Keep kids away, neutral is technically a current carrying conductor.

Then, first turn off the breaker on the input side, then close the TN bond you created (ie switch that dangling switch/breaker on). See if the error still occurs.

Switching back to grid is the reverse. First open the TN bond, then close the input side breaker.

If you forget to switch your danlgy switch and the bond remains, then the relay test will fail, but this time with “Error: PE2 Closed”, the reverse of what you’ve got now.

1 Like

Did read that, being a newbie with this.

It connects perfectly with the grid each and every time.
Yet it has an Error: PE2 open … when the grid is off.

Fixed my post … I will do this.

Just need a wee bit of time to build up the courage, as the house must go off, my Wife is in meetings the WHOLE day, and UPS’s not there to run loads for long periods, as there is no changeover switch at the moment.

Still at the problem …

Had many many flawless LS events, all not 8/10. It is so stable that I was told this morning that it is not the inverter.

So, being in the 8-10h30am time slot, I promptly switched off the DB.

Tadaaa …
image

Now in a 12pm LS slot, will see how it goes.

Did find this interesting, but have no idea what I’m looking for.

Waiting on some feedback in the meantime.
Also maybe found a MLT, to get as a backup.
Also, once the inverter is ruled out as not the problem, to redo the DB, testing every single circuit, and the earth.
… and check the solar array wiring.
… and add the 2nd MPPT’s surge arrestor.
… and install protection in the DB to keep Eskom far far away when there is LS.
… and some changeovers to switch geysers over to Critical loads DB, manually, if there is spare solar.
… and put a new changeover in, the faulty one that was removed.

In for a penny, in for a pound.

New one …

12pm LS, worked perfectly, till I switched on the kettle.
10:07 was me, 12:17 official LS, and at 13:39 the kettle was switched on during LS.
image

EDIT:
Switched off all the breakers, still LS, and tried the kettle again.
Worked.

Got an MPII 5kva inverter to test, compliments of Victron.

Now to do the change … with no changeover in place yet. :thinking:

Gonna be a mission, timing would be rather important. But I’m SO looking forward to eliminating the inverter’s relays, or not.

1 Like

Impeccable timing, not only the inverter, we have 8am LS again too.

image

DB off after the first error.
Panels off after the 2nd … my last test for that, running as a standard UPS basically.

Sourcing a Hager SF263 63a 2P Changeover, thanks for the idea @plonkster , then I can swap the inverter, and start with the 8 am LS schedule test first.

All the wiring is already there along with the wall braket and a 2h window with no power. Sounds like you don’t have to wait for the change over switch to make the swop. Quick 30min downtime to loose all the screws and wires and fasten then again on the swopped unit.

His wife works from home. And from experience I can tell you there is no such thing as a “quick” half-hour. I think that’s the reason for the hesitance.

(It has however also been said that sometimes it is easier to obtain forgiveness than permission, so that’s another way).

My advice was to spend a little to get the changeover replaced (that should take a day or two to source at most), and it is something that needs to be fixed anyway. Even if a DB-redo is on the cards, you’re still going to reuse the changeover… at most you’ll spend an extra R300 on a small 4-way DB box for the interim installation… which is about what we spend on milk in a week :slight_smile:

1 Like

Hahahahah!! that siemens coffee machine isn’t lite on milk, and coffee beans :rofl: :stuck_out_tongue: We standing over 500 cups already and 5 descaling and you know when I got that machine.

Not if you make the milk drinks, that I can attest to. We mostly drink straight coffee with a little milk (no sugar), and we’re at over 8000 cups. Here’s a picture from earlier…

Remember to clean the brewing unit at least twice month. It cakes up something terrible, especially when using supermarket beans. We’ve since switched to a local shop here called “Central Ground”. Much much better coffee…

Ditto.

I plan for the worst … anything else is a bonus … what is going through my mind too:
Slow is fast, and fast is slow.
Measure twice, cut once.
One is none and two is one

… wife has gone down thrice this morning, the first time she has “felt” my stress. She moved her office, no UPS on that Critical Loads plug.

So I rather not ask for forgiveness … clinging by my fingernails to life.:slight_smile:

Just send her on a 1 hour shopping run. It sounds like you need a new change over switch. Who does not like shopping for electronics :rofl:

The thought has crossed my mind, more than once. :rofl:

Yes, ons het seker oor 100 koppies met melk gedoen, toe trek ons daai perde kar se brieke vas want toe gaan ons deur melk. Ek self soos jy, bietjie melk en geen suiker.

Ek maak daai brewing unit gereeld skoon nogals. Ek gebruik die “Espresso Machine Cleaning Powder” wat ek vir my espresso machine gebruik om die “back flush” te doen en n kwas in die wasbak. Dit werk nogals goed. Nou die dag toe ek die cleaning setting moet doen, toe sit ek van daai in langs die kant in. Was verbaas wat als toe daar uit kom toe toe hy als deur die pype spoel binne die unit. Het die week sommer n houer met 100 descaling tablets ge order want ons het vinnig deur 500ml EcoDecalk gegaan. Ek koop my koffie bone by Peacock se fabriek om die draai van my werk en by Gourmet coffee roasters. Sal by Central Ground gaan loer.

MMMMaaaaaar wag, Ek derail nou hier. TTT is going to eat coffee beans after this.

1 Like

you will be surprise, his wife usually go do the electrical parts shopping for him :slight_smile: Legend!!!

30min “they” said … it is easy “they” said … yea right.

The first stumbling block, yeah one “sees” but does not “see”. The inverter was mounted first, right, and THEN the AC wires were connected, neat, short, and very tight inside some cool trunking. There is no way to take that inverter off, without a lot of work. So that took a good 40min to disentangle it all, just to get the unit off the wall.

10min, the new unit was connected, UPS only.

And THEN the drama sommer starts good.

The second problem, ok, let’s program the inverter. Nope, the internet is down. Ok, I’ll get to that, I’ve got this, look for the MK3. 15min more.

Keep in mind, people are circling like vultures, when is the power back … we need to work/study … when!? Vicious stares I tell ya.

Dont’s ask for permission “they” said. I did not … I was scared for my life.

Then the third problem hits … found the MK3, but where the f…k is the USB cable, WHO. TOOK. THE. USB. CABLE!!! a very dangerous voice shouted in the dark … the vultures dispersed like mist from the sun. I felt safe again. So that took another 15-30min to find one that works.

So nearly 4 hours later, the inverter is connected, ready to test 8am LS, and the internet works again…

If I find the “they” who said 30min tops … :slight_smile:

Re. the internet, thank snot for Hyper-V backups, had to restore the Firewall Virtual PC, after spending 30min on WA with Afrihost to check the router is connected and seen on their side. Need 20min to have it off for the cache to clear or some such, hence the 30min.

FWIW, Afrihost support on WA, their patience, just sommer damn great man! Respect to those guys.

My luck, Murphy and his Brother Uncle Bob, just sat there drinking a cold one. What will go wrong, shall go wrong, that is the law for TTT.

I got the Hager SF263 | 63A 2P CHANGEOVER SWITCH | B - Power and distribution : Modular Isolators/Contactors/Relays | ElectroMechanica.

Did not have the guts to install it … nope, not doing that.

What sparkie says is connected, and what I see is connected, best they come and do it.