9 hours ago, YellowTapemeasure said:

Nothing could be further from the truth. The Sunsynk Hybrid Parity (Super) Inverter can and does supply excess PV power to loads before the grid, up to the provided CT coil.

 

 

Hi YellowTapeMeasure

I'm wanting to understand this more in depth and this picture pretty much sums it up.

Where can I get more info? I'm hungry lion for knowledge!

36 minutes ago, jacquesretief said:

Hi YellowTapeMeasure

I'm wanting to understand this more in depth and this picture pretty much sums it up.

Where can I get more info? I'm hungry lion for knowledge!

Manuals for all products can be found here.

Sunsynk also released two training manuals in January 2021, one is more generic, and the other more product specific. I can't find updated versions on the Sunsynk site, but my copies are here.

 

On 2021/11/20 at 6:29 PM, Beat said:

Besides what Coulomb mentioned, if only one of the panels becomes faulty, the whole array in series will have no output.

If a panel went completely open circuit, yes. But there are diodes to prevent the voltage across the panel going negative (usually 3 diodes, across each third), so that generally one panel going out won't cut the whole string. The exception is where light or the total number of panels is marginal, such that all panels are required to produce any output at all.

On 2021/11/23 at 2:28 AM, Coulomb said:

If a panel went completely open circuit, yes. But there are diodes to prevent the voltage across the panel going negative (usually 3 diodes, across each third), so that generally one panel going out won't cut the whole string. The exception is where light or the total number of panels is marginal, such that all panels are required to produce any output at all.

Thank you Coulomb, I'm learning every day. That diode protection certainly works well if there is only one such string. I'm questioning myself, if there are two or more strings in parallel, the string with a faulty panel will have less output voltage than the other(s). That would result in significantly less output power - wouldn't it? And as less sun power is converted to electricity the panels would heat up faster than the others thus reduce output voltage even more.

15 hours ago, Beat said:

if there are two or more strings in parallel, the string with a faulty panel will have less output voltage than the other(s). That would result in significantly less output power - wouldn't it?

Yes, significantly less power from that string. The shorter the string, the larger the effect.

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And as less sun power is converted to electricity the panels would heat up faster than the others thus reduce output voltage even more.

True, but that would be a minor effect, only a few percent. a 20% efficient panel is absorbing as heat 80% of the sun's energy already. If one third of a panel was shaded and produced zero output, that would mean that the panel absorbed 87% instead of 80%, a ratio of 1.09. Also, the zero-output third would not conduct its heat very well to the other thirds, losing a lot of heat to the surrounding air before it could heat up the active cells.