Vince here from Hartford. Working with several Eversource commercial customers and I'm seeing a pattern. Soft start devices on chillers and large RTUs seem to fail more often during extended heat waves. Had three separate clients get hit with demand spikes this summer when their soft starts failed during 95°F+ days. Two were under 5 years old, supposedly 'high quality' units. Is summer heat causing more soft start failures, or am I just seeing coincidence? Anyone else noticing this pattern?
Soft start failures more common in summer heat?
Frank from Cleveland here. FirstEnergy territory sees the same thing. Heat definitely affects electronic components in soft starters. The capacitors and control circuits are rated for specific temperature ranges, usually up to 104°F ambient. But inside an electrical panel in direct sun, temps can hit 130°F+ easy. I've started recommending panel cooling fans for any soft start installation that might see high ambient temps.
Rachel here from Atlanta. Georgia Power customers definitely see more soft start failures in summer. The other issue is utility voltage tends to sag during peak demand periods. Soft starters rely on consistent voltage for proper operation. When voltage drops to 220V or lower on a 240V system, the soft start logic can get confused and either fail to start or bypass entirely. Combined with heat stress, it's a perfect storm for failures.
Juan from New Orleans chiming in. Entergy territory has brutal summer conditions - high heat plus high humidity. I've seen soft start failure rates go up 300% during July-August compared to spring months. The humidity is actually worse than the heat for electronic components. Condensation forms inside panels overnight, then evaporates during the day, creating thermal stress cycles that kill components faster.
Pete from San Jose here. PG&E territory doesn't have the humidity issue, but we definitely see more failures during heat waves. The key is proper installation - soft starters need adequate ventilation and should never be installed in direct sunlight. I've started specifying enclosure cooling systems for any installation where ambient temps might exceed 100°F. Adds cost upfront but prevents expensive demand spikes later.
Susan from Oklahoma City here. OG&E customers see this too. One thing that helps is regular maintenance on soft starters during spring months, before summer heat hits. Clean the contacts, check connections, test the control logic. Most failures we see are actually dirt and corrosion-related, made worse by heat stress. A $200 annual maintenance call can prevent a $5,000 demand spike.