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Old 20-01-2021, 00:36   #31
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Re: Solar Panels and Controllers

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Originally Posted by CaptainRivet View Post
The LG neon 2 bifacial has 390W Front and 120W back, so in total 510W while sunpower only 400W front. On davits the bifacial work well.
LG also has a better low light perfomance and due to the 12 bus bars partial shade on the panel only takes the row down which is shaded, the other rows deliver full power. Additional they deliver on lower sun angles to the panel. I have 2 LGs on my davits and they perform really well.
So i would prefer LG over sun power, max performance per sqm is not all.
Even at 510 W (under optimal conditions, however on the water with all the reflectivity I assume that would be the norm) the difference in size is quite big. But they are cheaper so overall they will be comparable I guess when it comes to value.

There is also a 415W variation of the LG Neon 2 Bifacial in the same size - so this one might be even better? (the difference in price is negligible): https://www.europe-solarstore.com/lg...415n2t-l5.html But then again the LGs are also heavier by 10% (2.5 kg)... So tough to decide

Do you know if there are any other differences?
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Old 20-01-2021, 03:28   #32
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Re: Solar Panels and Controllers

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Originally Posted by CaptainRivet View Post
But they did interfere, i could reproduce it.
It were the integrated solar charger from the silentwind wind gen controller and one victron MPPT 50/100.
Swaping to 2 victron MPPT 50/100 connected via VE-bus and synchronization solved it.
If the controllers are programmed to regulate at 14.6v, it should not be possible, if they are functioning correctly, for the battery voltage to reach 20v as you have reported.

I suspect the Silentwind controller was faulty or has been wired incorrectly, but I have never used this model so perhaps this has a weird software glitch. Wind controllers use dump resistors (generally for the wind regulation only) so their behaviour is fundamentally different to solar controllers. Unlike solar controllers, every manufacturer’s implementation is unique so their behaviour is not always predictable, but if working correctly they should still always cut power at their programmed voltage.

Removing the Silentwind controller and replacing it with a Victron controller has obviously fixed the problem. Linking the Victron controllers is a good policy, and is easy to do with the modern units, but the battery voltage will not rise to very high levels if the controllers are not synchronised. There can be some minor conflicts with multiple controllers where the absorption time is not ideal (usually too long), but these problems do not result in the very high voltages you experienced.

Anyway, the problems you have experienced are not a normal consequence that people using multiple controllers need to be concerned about.
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