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EEVblog 1499 - EcoFlow Delta Pro 3.6kWh Portable Battery TEARDOWN!

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mikeselectricstuff:
As a comparison. the Bluetti AC500 switches to inverter in one half-cycle ( 10mS), and back with no obvious glitch at all - it re-syncs to the mains before switching back
https://youtu.be/RuEO17uvI8M?t=1954

Billy Tree:
My objection is characterizing a specification stated up front as some kind of design flaw.
And your 3 refrigerators is not a typical use case, neither is your issue for any other user on the groups - and there have certainly been complaints.
Are they commercial refrigerators or just typical capacity household units?

EEVblog:

--- Quote from: Billy Tree on October 19, 2022, 08:53:26 am ---My objection is characterizing a specification stated up front as some kind of design flaw.
--- End quote ---

It literally is a design flaw  |O
Which is why it's mentioned in the manual, so people are aware of the flaw, but I didn't see that before I did the video, which is why titles the video "RTFM Dummy"
You are just being pedantically annoying now.


--- Quote ---And your 3 refrigerators is not a typical use case, neither is your issue for any other user on the groups - and there have certainly been complaints.
Are they commercial refrigerators or just typical capacity household units?
--- End quote ---

Just normal household fridges.
It's not the three fridges that is the issue, it's at least one of them that is disturbed by the brief interruption, but not always, it depends on what cycle it's on I suspect.
I will not discuss this further with you.

EEVblog:
FYI, someone in the Youtube comments pointed me to fridge brownout protectors.
https://www.amazon.com/Exceline-Voltage-Electronic-Protector-Refrigerators/dp/B07Z5BH691
Silicon chip even did a project:
https://www.altronics.com.au/p/k6049-240v-mains-brownout-protector-kit/
And they don't seem to be a thing in Australia? I can't find one with an Australian plug :-//

They detect the brownout and add a several minute delay for the fridges to lose pressure before connecting the mains.

I'm not aware of a DIN rail mount version though? A simple DIN timer may not dectect the brownout.
EDIT: Found one: https://d347awuzx0kdse.cloudfront.net/nawcontrols/product-download/17udt0.pdf

electr_peter:
So theory that fridges are very fussy about brown-outs is confirmed. Probably because compressor has to overcome internal pressure "step", otherwise it stalls and loses momentum (and can't start again properly).

DC-DC converters, MCUs, FPGAs also may go crazy during brown-outs (via different mechanism, of course).

I see future video about this topic ;)

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