[Mc2guy]

The DC charger that came with your Bluetti will charge the unit, but slowly (100W), when the van is on or the DC plug is hot (ACC ON). No other wiring needed.

This will take a long time, however, given the relatively low wattage of the DC charger. You need to divide your Bluetti's Wh capacity/100W to determine how long it will take, plus some efficiency losses in coverting the 12v to the wattage of the battery itself (50V in a Bluetti AC200). The answer is a long time, which is why most use roof-top solar or an inverter wired to the CCP charge points in the van to increase the charging rate.

 

[Mc2guy]

Thanks for the great answer! So I thought the battery would charge via DC from the car. Why would you convert this to AC to charge the battery? The DC input on the Bluetti is also the solar port and I thought that could charge at a much faster rate via solar panels or with the optional AC charger you can get for it. Sorry, this is kind of new to me so I might be asking the wrong questions.

So the charge rate for solar input on the AC200P that I have is up to 700W. I have 400 W of panels currently installed on my roof. This is definitely a faster charging method that the DC plug... also, the vehicle doesn't have to be running to access the power, the sun just has to be shining. The reason some choose to an inverter based charging is that for the AC200P, the wall charger can provide 400W of charging power IN ADDITION to the solar, giving you up to 1100W of charging. The challenge is that you cannot run an inverter that is capable of powering the wall charger off a standard 12V outlet... it must be hard wired into the high-power customer charging points (CCP) that are on the transit. I suggest spending some time reviewing the content on this site regarding inverter installation if you want to go that route... it isn't quite as simple as it sounds, so make sure you are comfortable and educated before proceeding.

For reference, I have both, but only turn on the inverter when I really need to (like a really cloudy day when I've already run the battery down), otherwise, solar is the cheapest and easiest route, other than just plugging into a wall outlet in your driveway (which I've done at times as well).

 

[Mc2guy]

For reasons I won’t get into in detail because I’m typing on a phone; the Bluetti needs solar to be a viable alternative to a piecemeal battery/inverter build out. The parasitic losses from the battery management systems and 50>12 volt converter are material (200Wh/day). It’s a great option for a weekender like me, but if you are running a refrigerator all the time or otherwise need 24/7 12 volt power, solar is absolutely critical to keep the battery charged (unless you drive multiple hours every day).

If you can turn the battery off and leave it off, this is a moot point, but if you want full time 12v power, go solar.

 

[Mc2guy]

If you can send a charge of over 1kW in from the alternator, then the solar shouldn't be an absolute. That ~200Wh would be replaced in less than 15 minutes of idling.

Clearly, I have no dog in this fight... you do you.

Power is power. See how much the losses are and the load / demand and accommodate charging appropriately.

All that said... I realize these things are a bargain compared to assembling one... but there's a reason. They're not a bargain; they're just inferior. Perhaps adequate - and nothing wrong with that for the price. It would cost a bit more and require more effort to assemble a good setup; and these are easy and cheap. You do you!

@chadman, I think you're good if you max the charging with a half-decent inverter connected to CCP2 and the two-AC adapter setup. Couple hundred bucks for a decent PSW inverter (not an assurance of quality, but perhaps more likely to be decent). I use this one: https://amzn.com/B07CKBJ9KP and they make less expensive but also decent ones like this: https://amzn.com/B07SJYR5G7 that should meet your need.

You're a bit OT, and frankly, don't know the entirety of which you are opining... so I'll be polite and say that my dual degrees in electrical engineering and applied thermodynamics and 20 years in the distributed power generation industry disagree with your assessment of the situation. But you do you.