We hear a lot of complaints from DIY Solar Enthusiast about incorrect readings on their Harbor Freight charge controllers.....better known on our forum as the PDU. The "Power Distribution Unit".
But complain no more, forum Bill K. shows us [see photo] how you can take the cover off that unit and where you can adjust the cal pot.
See you on the forum!
Everything You Need to Produce Your Own Solar Energy.....Check Out New World Solar Power!