Installation Guide

Classic owner’s manual Rev I 2193
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Uploading New Firmware to the Classic
The Classic has the ability to have its firmware updated with a standard USB cable and a Windows based
PC. The USB cable is Standard to Mini B. Please see
www.midnitesolar.com and click on the Software tab
for the firmware and instructions. Due to the various different Windows configurations we will not go into
detail in the Classic Manual. The Firmware upgrade is fail safe so if the wrong code is installed the Classic
simply says ―Wrong code‖ prompting you to load the correct code. Also if the upload is interrupted for
whatever reason simply start over.
WARNING!The Classic's USB port is NOT isolated from battery negative. This is typically only an issue on
positive ground systems or systems with a tripped ground fault protection device. Care must be taken that a
computer connected to the Classic's USB port is either isolated from ground and the Classic's negative or
that the computer's USB negative is common with the Classic's negative and ground.
WARNING! You cannot turn a Classic 150 into a Classic 200 for example using new software, the internal
components are also different.
Figure 23
Prepare Classic charge controller for update.
1. Go to your electrical panel and identify the input and output breakers for the Classic. Turn them off. Wait 3
minutes for the Classic to de-energize.