Recently I used the VA Tester to monitor battery charging via a solar panel. Here is a picture of the setup.
This setup is with the VA Tester and the Bluetooth Backpack. I am able to monitor the battery from anywhere in the house. The cool thing is I can tell from the graph whether the battery is charging or supplying power.
Here is a picture with the OLED Backpack. You can see that it shows -8mA so the the battery is being charged.