Soft Starter for power tools failed driving water pump

摘要

I recently finished building the Jaycar Soft Starter for Power Tools kit, KC5511, based on the SILICON CHIP article in the July 2012 issue. The unit worked OK for a couple of days but now seems to have failed. Opening up the box reveals that the NTC thermistors have fallen apart. I have two 150W solar panels feeding into an MPPT Solar Charge Controller and then into a 150Ah ACM Deep Cycle Battery which powers a 2000W inverter.