Charging AC200Max with DIY external batteries through the PV input.

Is anyone experiencing the same issues that this other Youtuber is having?
Youtube channel -Sid Jones - Random Stuff (he has tried MANY different ways to make his Bluetti charge via external batteries)

He (and lots of other people on the web) are experiencing LOTS of issues with charging their Bluetti through the PV port while using their own standalone batteries.

Have any of you you experienced anything similar with your AC200Max?
As far as I can tell they’re all using the older Bluetti AC200 models and I’m wondering if the problems with static voltages (that’s what they’re all presuming is the problem with the built in MPPT) are resolved with the newer units.

Also can we get an official acknowledgement from someone at Bluetti as to why this may be occurring?

What would cause this?
The specifications give a voltage range, why should any stable DC input within that tolerance not be able to be used as an input?

EDIT:

I’m also now reading through this forum and there quite a few people with problems with the MPPT who are legitimately using solar inputs as well.

I just received my AC200Max today and I’m very excited to use it, but I really do hope that these problems are solved and they aren’t still here from the earlier AC200 models.

Hello,
I have two AC200max, I do not use external batteries to recharge the AC200max via the DC/solar input, but I use an AC/DC 12V power supply to boost the recharge of the AC200max via the DC input and I have never had problem of power drop after a certain time. Note: you must follow the manual which explains that you must set the DC input to “others" (and not to “PV”), I guess it’s to disable MPPT.

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