Bypass Diode Checker can detect open fault of bypass diode in PV module.
It is a small and low-cost product which is focused on simple operation and night-time measurement.
It can be used on-site at night-time so that it makes any interference with power generation amount.
Moreover, it can measure via the output terminal of PV string in a junction box, so it does not require a work on a high place like a roof.
It enhances a maintenance efficiency and safety.
When partial power reduction
occurs, a bypass diode works.
(It is mainly occurred by shadow)
In the fault case, the reverse voltage which is happened in a shadowed cell causes overheat or burnout.
Bypass circuit is safety function like airbag and seat belt in automobile.
This is an important function, but it cannot be checked by a general power monitoring.
This bypass diode checker is a PV module maintenance equipment can be used in junction box.