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Ginlong Solis: What is "Low ripple control technology to improve battery life"?

cj0

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Joined
May 29, 2024
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52
Location
NL
Some (Ginlong) Solis "Technical brochures" mention the residential energy storage products, with these models:
  • S5-EH1P(3-6)K-L
  • S6-EH1P(3-6)K-L-EU
  • RHI-3P(5-10)K-HVES-5G
  • S6-EH3P(5-10)K-H-EU
  • RAI-3K-48ES-5G
  • S5-EH1P(3-6)K-L-UN

Under heading "safe and reliable" there is a bullet named:
Low ripple control technology to improve battery life

I know that Victron inverters do ripple monitoring on the DC bus, and shuts off the inverter after 3 seconds of too high ripple voltages. I have tried to ask Solisinverters Europe. They react very defense and don't answer the question.

What could be meant with this marketing lingo "low ripple control technology", and how could/would that work?

Or are just a bunch of extra high capacitance values capacitors connected to the DC bus?
(Victron community forum states that the Multiplus II has 3.9mF of Chinese Sancon capacitance on the DC bus.)

Anyone ever measured the capacitance on the DC-bus of a low voltage battery Ginlong Solis inverter?
 
Or... just some meaningless marketing drivel.
I'd only call an AC component on the battery connection an issue if it caused a zero-current crossing.
 
Finally I received an answer from Ginlong Solis for what "low ripple control technology" does.

The Ginlong Solis "low ripple control technology" applies to AC to DC buck conversion (battery charging from grid). The duty cycle of that buck converter is inverted with the frequency of grid (50±2Hz). As a result the output of the buck conversion is closer to DC, than it would be without.

In short: more bucking when the ac waveform is high and less buck conversion when low.

How would the competitors do AC-to-DC buck conversion?
 
Doesn't make sense to me. I would have expected the AC to be rectified and smoothed before the buck conversion of voltage. But I'm no expert on analogue electronics!
 
I can tell you that ripple caused by buck conversion for my Victron Quattros when they charging the battery is of much less concern than boost conversion when they are inverting. If they had some magic trick for reducing ripple when inverting, I'd be paying more attention.

I don't think they've done anything special here.
 

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