I have an AC180 and a cable connecting the cigarette DC port of the Bluetti to a 12V battery to charge it. I used it like that for weeks with an AGM battery outputting 120W. It seemed normal.
Then I got a lithium EcoWorthy 100Ah battery with Bluetooth. Same exact setup and cable. At times I get no DC output from Bluetti to this battery, at times 15W, at times 40W maximum. I noticed if the EcoWorthy is very low, like say 15% Bluetti can output some 40W, but when EcoWorthy is like 40% it stops charging it…
I do not understand. Where can the issue be? Any help please? Thanks!