
AC200L with DIY expansion battery not discharging at low DC power draw.
Hello everyone. I've been using a Bluetti AC200L in my camper van for week long trips and recently we added a DIY expansion golf cart battery. When we have high AC power draw the expansion battery will discharge. But when we only have things like 12V lights and refrigerator running the expansion battery does not discharge. Has anyone done further testing with this kind of set up? 95% of the time we only have a few low power draw DC things running so the expansion battery isnt discharging and I'm worried we spent all that money on a battery that isnt helping our electrical system. All youtube videos I've seen for DIY battery expansion do testing with high AC power draw. Any information is greatly appreciated.
Edit: We have a DC fuse block connected to the AC200L 12v connector. And the expansion battery is connected to the AC200L via the bidirectional power cable that comes with the Bluetti Charger 2