Timeline for 12 VDC to 380 VAC for 1 kW, 3-phase motor
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 22, 2022 at 10:08 | comment | added | PStechPaul | It is an old 480V 5 kW (8 HP) VFD that I bought for about $60, and the inverters were only about $30 each. Used 480V VFDs can be purchased pretty cheap on eBay, as most hobbyists and DIY freaks don't have 480V available. These VFDs are not really designed for single phase, as the capacitors are insufficient, but using DC from an inverter, using a high frequency switching supply, means the capacitors can be smaller | |
| Nov 22, 2022 at 10:00 | comment | added | Criticizing Israel not allowed | so I think you meant to apply to the VFD's DC link. This is liable to blow up a VFD designed for half that voltage. Of course modifying two inverters and a VFD voids the warranty on all 3. | |
| Nov 22, 2022 at 9:57 | comment | added | PStechPaul | I did connect the DC outputs together with a resistor (12 ohm 5W IIRC) to limit surge current, and I connected them after they were powered up by using a switch. The only current surge will be from the charged capacitors in the inverters, into the uncharged capacitors in the VFD. Each inverter still has its usual 320 VDC and only the VFD will see 640V. | |
| Nov 22, 2022 at 9:38 | comment | added | Criticizing Israel not allowed | surely wiring inverters in a way that gives double voltage is liable to just blow them up | |
| Nov 22, 2022 at 6:11 | history | answered | PStechPaul | CC BY-SA 4.0 |