i currently have ac200max and a B230 unit in my car with a 1000w inverter, with 2 x charging bricks, each brick inputting 476w into each unit
I want to simulate 900w solar power into my ac200max, if i need to upgrade to a 2000w inverter or add another 1000w inverter (which i already have) i will do,
it seems a waste to use the cigarette lighter 100 or so watts, when the bluetti can take 900watts, there must be a unit out there to do this when driving,
If you can find a 12V to 60V or 72V DC-DC converter to convert your car’s 12V directly from the alternator (not from the ciggie lighter socket), to 72V, you can achieve 900W at 12.5A. Problem is, I have not seen one that converts up to 72V. Highest I have seen is 12V to 48V 10A.
I have 700W max from 12V, this is taken from a post I left on fast car charging, but it’s not getting a lot of attention but folks are very interested in this. Fast Car Charging
This is a 12V-48V DC-Dc which is capable of 20A but limited by the AC200Max to 15A at 48V
Details below
In my case it’s from a 12V 560Ah Battery bank on my RV, but this is relevant to vehicles too, probably more so, I’m going to do the same in my car so when I leave the RV I’m topping up the AC200MAX when touring.
Setup in the RV is a bit simpler. I’ve measured the idle current of the WG-12S4820M DC-DC and it’s not worth any complex isolating, less than 1w.
This is all mounted externally.
Protected the battery with a waterproof 100A CB.
WG-12S4820M is IP67 waterproof and aircooled, it’s mounted externally too.
48V lines are protected with a simple 20A midi fuse.
I’ve tested it in use with the AC200 Max running my RV aircon, about a 1.3KW load starting from full with a 700w input from the WG-12S4820M DC-DC.
I can get about 5 hours of Aircon, when it stabilises the temperature and starts to draw less.
WG-12S4820M DC-DC draws approx 58A at 12.8V, and gets warm to hot.
It can definitely handle the load and stay passively air cooled in 100f/36c degree heat
AC200Max takes 14.75A consistently, with the WG-12S4820M DC-DC at 48.05V
Cabling is important, bluetti pv cabling gives quite the loss around 11W, and cables run warm, but not hot when using the solar connectors as an interface, I’ve got an aviation connector coming to make my own cable to get those losses down.
2AWG is around 4w loss.
Self usage on the WG-12S4820M is around 25w.
Total conversion power cost around 40W, AC200Max says 707w in, Battery BMS says 755w out, so more or less correlates, and I cant measure battery internal losses.
I’m very pleased with the setup, recharging the AC200MAX from 0 takes about a 3rd of my RV battery.
Links for the DC-DC below.
12v-48V DC-DC 20A
Hi RangeyRover, that sounds like the solution i need, does the 12V-48V DC-Dc need to be adjusted down to 15amps or does the AC200max do this automatically ??
i also had a thought about adding a parallel xt60 lead, so that the cigarette lighter could also add another 100watts at the same time ??
i found this below as well, that looks like it could do the 900w
https://www.aliexpress.com/item/1005004953801968.html?spm=a2g0o.home.0.0.650c76dbCcI1Ax&mp=1
whats your views on that ??
hi ive just realised the item in the link i posted is a charger
