Hi, I recently bought an open box growatt 24v and had plans to put 2 12v batteries in series. I have become too scared to do this as I don't want to damage the BMSs. However, I need to test it. I hooked up AC to it and nothing happened. After reading a bit, I found that there needs to be a battery input. Can I use a battery charger that outputs 24v to simulate a battery? Barring this, I don't have any way of testing it. Kind of a noob! Thanks!