Nuno Donato

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since Sep 18, 2013
Portugal
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Recent posts by Nuno Donato

frank li wrote:Make sure protective earth is terminated with all equipment on one end and the ground electrode(s) on the other like a tail poked in the ground and it will be safe as can be so long as it has ground fault protection.



Yeah I have a big rod where the ground wire connects to, on the other end of the wire it connects to a bus bar on my switchboard, where all other ground wires (coming from sockets and etc) will connect to.
1 week ago

frank li wrote:I get it now. All should be fine. Just make sure you land the terminals with the right conductors indicated in the manual. Its like split phase no neutral. Except the ground. The ground is neutral. Do not short your inverter.



So if I understood your reply correctly, there's nothing I should be doing differently and these readings are ok?
1 week ago

frank li wrote:Is it that your lines are split between services? Ther is something im not getting. I am unfamiliar with european electrical. Still.

Do you have 2 conductors and a ground?



I dont have any "services", its fully offgrid

AC output from the inverter is Line+Neutral.
1 week ago

frank li wrote:What inverter do you have in place? With some inverters you will have an odd response.



It's an Axpert 5kva. Not sure if I should bond ground and neutral too... the manual doesnt say anything about grounding :/
1 week ago

frank li wrote:You can get that anywhere the line is loaded. If you open a switch or breaker feeding that line, there should be nobody home.



but shouldnt hot to ground be the same (or nearly) as hot to neutral?
1 week ago

frank li wrote:When wiring, it is best practice and should be s.o.p., all grounding landed first, especially before introducing live conductors.



Hi Frank, thanks for the comments, much appreciated.

So I decided to bury only 1 rod for now, near the inverter, and test the system.

The output of the inverter, between live and neutral is 230V. But, oddly enough, when I measure between live and ground OR neutral and ground, I get a reading of approximately 110V!!

Any ideas what could be causing this? Or what kind of tests/checks I can do to diagnose the problem?
1 week ago
Hi folks!

I just finished plugging in my panels to the inverter and now taking care of grounding and connecting AC to the house.

I got 3 grounding rods and was planning to place them as in the picture:


Does this sound a good idea or am I making some big mistake? I read somewhere that having multiple ground rods can actually be harmful, but in my case, they are all connected so it should act as just one, right?

Reason for this? Just playing safe and trying to get the best ground possible.

Thanks in advance for any tips/advice!

PS - this is a simplified drawing, obviously there are switchboards, fuses, batteries and all of that :)
1 week ago

S Bengi wrote:8*12v*260AHr=25kWHr.
With a daily production of 8kWHr.
That's 4X, your setup is looking nice.



I wanted to be on the safe side, since we will depend on electricity for so many things!!
Now I just want to get all this stuff wired up without blowing up anything :D
2 months ago
Actually I do have 48V on both sides.
I have 8 12v batteries, so my plan is to create 2 banks of 48V (4 in series), and then connect them in parallel

they are rated 260Ah (C100)
2 months ago

Mark Tudor wrote:Maybe things have changed since I saw it, but seeing that wiring diagram for the batteries reminded me of a recommendation to wire up the batteries so that each battery sends/receives the same voltage/current, so each battery is used evenly. Is that actually a thing?



I saw that a few days ago and it made a lot of sense, the guy made some tests and got very different results.
But I guess its more relevant when you have a lot of parallel wiring, as that is when the current matters
2 months ago