The Hioki FT4310 Bypass Diode Tester allows you to detect for open faults even when the sun is out without covering the panels. Also test for short-circuit faults and cell string losses. Traditionally, bypass diodes can only be inspected for good working condition at night or when power is not being generated by the solar panels in order to verify that any applied current is guided past the solar cells. With the FT4310, you can detect for open faults even when the sun is out without covering the panels. Testing can also be performed at night.

Test for bypass diode open faults and other malfunctions using the strings in junction boxes, eliminating the need to climb onto the roof and dramatically improving work efficiency.

Save time by simultaneously measure all electrical parameters. Simply set the rotary knob to "BPD TEST" and press the "Measure" button to measure and display all parameters necessary for fault identification (open-circuit voltage, short-circuit current, and bypass route resistance). Measurement takes 2 sec. or less per string!

Measured values held on the display are sent immediately to a smartphone or tablet via Bluetooth wireless technology. Save date in CSV or PDF format. Eliminate the need to take notes - particularly useful at sites with a large number of test points.