Inverter capacitors can still hold a dangerous charge after the AC and DC sources have been disconnected, so touching internal parts can cause a life-threatening electric shock. PV modules in sunlight charge the inverter's DC bus capacitors, and that charge stays in the capacitors after the PV input is switched off. The danger applies to string inverters, central and battery inverters, and the manufacturers put warning labels on the equipment. The main control is a discharge wait after all sources are disconnected and before the cover is removed. This is 5 minutes for several string inverters and Yaskawa-Solectria equipment, and 15 minutes for the Sunny Island. Some older CPS central inverters need 60 minutes after all inputs are cut off, or a successful De-energy command, before maintenance. On FIMER inverters, check the regulatory label for the discharge time and wait until the internal capacitors have discharged.
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subclass_ofc1 drafted · lead Electric shock
Capacitors in inverters can still hold a shock hazard after every supply source has been disconnected.
sec=h21 h=65305ae518d2sec=h23 h=94ac31790aeasec=h88 h=478038ee477dtbl=8.r3 h=f02f0ce7d1accontrolled_byc2 drafted · lead Capacitor discharge wait proposed
Yaskawa-Solectria says to wait at least 5 minutes after removing all AC and DC sources before working on its equipment.
sec=h23 h=94ac31790aeasec=h23 h=94ac31790aeasec=h96 h=2e637a310625c3 drafted · lead Capacitor discharge wait proposed
Scope: products CPS SCH350KTL-DO/US-800
Keep the cover on until 5 minutes after all supply sources are disconnected.
sec=h21 h=65305ae518d2c4 drafted · lead Capacitor discharge wait proposed
Scope: products Huawei SUN2000-25KTL-US / SUN2000-30KTL-US
A delay-discharge label calls for a 5-minute wait after disconnecting all power before removing the cover.
tbl=8.r3 h=f02f0ce7d1acc5 drafted · lead Capacitor discharge wait proposed
Scope: products Sunny Island 4548-US / 6048-US
Wait 15 minutes before opening the unit so its capacitors can discharge.
sec=h88 h=478038ee477dc6 verified · fact Capacitor discharge wait proposed
Scope: products FIMER PVS-60-TL-US string inverter, UNO-DM-6.0-TL-PLUS-US string inverter, FIMER PVS-166/175-TL-US string inverter, UNO-DM-3.3/3.8/4.6/5.0-TL-PLUS-US string inverter
Wait until the internal capacitors have discharged. The regulatory label gives the discharge time.
sec=8 h=a2de404e05ecsec=h200 h=a2de404e05ecsec=10 h=518b45241c37sec=h206 h=a2de404e05ecsec=8.2.4.8 h=5add25577173verified by: review-workflowverified on: 2026-10-24
c7 verified · fact Observe equipment safety labels proposed
Scope: products FIMER PVS-60-TL-US string inverter, UNO-DM-6.0-TL-PLUS-US string inverter, FIMER PVS-166/175-TL-US string inverter, UNO-DM-3.3/3.8/4.6/5.0-TL-PLUS-US string inverter
The regulatory label shows how long the stored energy takes to discharge.
sec=8 h=a2de404e05ecsec=h200 h=a2de404e05ecsec=10 h=518b45241c37sec=h206 h=a2de404e05ecsec=8.2.4.8 h=5add25577173verified by: review-workflowverified on: 2026-10-24review note: support check: partial - Passages say regulatory label indicates discharge time, but don't frame it as a general observe-safety-labels control; core is present.
has_hazard c5has_hazard c5