Salvo wrote:
Nice demos! I still think your battery is shot. How much solar do you have? What happens when voltage gets to 14.7 or 14.8V? Does the controller immediately drop down to a lower voltage? The fact that voltage can quickly change indicates the battery has high resistance.
I'm not sure what's going on in the first video. Why is the voltage all of a sudden taking off? Did the inverter disconnect the load first? Or is there an increase in charging current?
The second video makes more sense. The inverter load is removed and the voltage takes off.
Looks like the software displays charging current. Can you connect something like two 20W loads to the inverter (perhaps two 20W lights)? Toggle one of the loads on/off and measure battery voltage. The charging current should remain constant. The battery voltage should jump with each toggle. We should be able to determine the battery resistance with this test.
Sal
I have 280 watts solar with 12V panels. The exact thing is happening in the first clip as the second clip, the laptop is just being charged via the large inverter instead of the smaller one. It is just as you described, voltage spike from removing the load from the inverter. I guess I was zoomed in to far to see that. The current stays constant during the spikes from what I remember.
