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analog8484
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Joined: 11/11/2021
Location: United States
Posts: 230

Posted: 06:26pm 30 Sep 2026

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Godoh said
It growls and varies in sound very unhappily.
When I am charging the car it is also AC coupled to two grid inverters that are helping supply the charge to the car.

The scary sounding growls are likely mainly due to the inverter being unhappy with AC coupled GTI injecting anti-islanding disturbances. I have heard it many times in my testing.

The EV charging probably helped the system from total shutdown as it absorbs at least some of excess power from the GTI backfeed. I have tested turning on large resistive loads with similar effects.

Godoh said

The commercial Latronics inverter doesn't have a problem with it, but the home made 8010 inverter sounds like it may blow up, so i switch over to the latronics inverter whenever charging.

I believe the Latronics inverter is pretty old/obsolete? If so, it's encouraging that an older inverter likely with limited control HW is able to compensate for the non-linear disturbances. It gives me hope that perhaps the control HW horsepower required to compensate for non-linear loads might not be so high?

Godoh
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Joined: 26/09/2020
Location: Australia
Posts: 709

Posted: 09:10pm 30 Sep 2026

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Hi Analog, thanks for the reply.
The 8010 inverter doesn't make the same noises normally when the GTI inverters are back feeding through it. Only when the EV charger is connected.
When charging the EV there is often around 4kw of power or up to 5kw input from the GTI inverters.
Normally the batteries don't charge at more than about 2kw max as the regulators are already doing their job at that power

Latronics inverters are no longer made, the company shut down a couple of years back, the 3kw inverter is about 4 years old now, I have never taken the covers off to see just what is in there, it is a transformer based unit.
buy yes it runs the car charger fine. Doesn't seem to mind the GTI inverters doing their bit and back feeding.
Pete

KeepIS

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Joined: 13/10/2014
Location: Australia
Posts: 2273

Posted: 11:11pm 30 Sep 2026

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There was nothing special about the Latronics I've looked at, I've tested a few and pulled them down for parts. You can't really compare how different inverters sound and imply a better or different control, different toroids, winding, caps, power levels, switching speed, dead time, cabling, chokes, etc, etc.

With ZERO control feedback the waveforms are still similar with a stupid Diode control HeatGun load.

If you want to redesign a new Inverter or Control system, then perhaps a new thread would be a good idea, as this Inverter works perfectly and does not have a problem with Half Wave corrupted AC Loads, and has not failed after years of over 35kW Peak DC inputs daily.

NANO:Inverter V 8.4ks - Linux AvrDude GUI script V4.1

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