=== Notes from an interim correspondent, on a 5 KVA unit === * The inverter menu has 4 voltage measurement readings. But the inverter hardware only has 3 voltage sensors. And only 3 voltage sensor correction calibration settings. The 4th voltage reading is just the difference between two of the voltage sensor readings. "Vac L2" reading is just the "Vac L" reading minus the "Vac L1" reading. This is why it is very important to calibrate the voltage sensors. * The "Vdc Correct P3014" setting calibrates the DC voltage input sensor. Use an accurate DC voltmeter (such as a calibrated digital oscilloscope with a differential probe and a DC RMS voltage math function) to measure the actual DC input voltage from the Prius. Adjust the inverter "Vdc Correct P3014" setting so that the inverter's "Vdc" sensor reading matches the portable voltmeter's actual reading. Raising the setting 4 numbers raises the inverter's sensor reading about 1 volt DC. * The "Vac L Correct P3017" setting calibrates the "Vac L" voltage sensor reading in the inverter's menu. This voltage will be about 240Vac. Use an accurate AC voltmeter (such as a calibrated digital oscilloscope with a differential probe and a AC RMS voltage math function) to measure the actual AC voltage between the two lines of the inverter output. Adjust the "Vac L Correct P3017" setting so that the "Vac L" reading in the inverter menu shows exactly the same reading as the calibrated oscilloscope reading. (Lowering the setting 5 numbers lowers the reading about 1 volt AC) * The "Vac L1 Correct P3016" calibrates the "Vac L1" voltage reading in the inverter menu. This voltage should be approximately 120 Vac. Use an oscilloscope to measure the L1 actual output voltage. Adjust the "Vac L1 Correct P3016" setting so that the "Vac L1" reading matches the oscilloscope measurement. (Note: the line "L1" in the inverter menu is the wire terminal "AC2" printed on the back of the inverter. And vice versa) * Measure "Vac L2" output with an oscilloscope. Compare to the inverter menu "Vac L2" reading. If "Vac L" and "Vac L1" are calibrated right, then "Vac L2" should be accurate and should match "Vac L1" and the sum of "Vac L1" and "Vac L2" should equal "Vac L". (Note: the line "L2" in the inverter menu is the wire terminal "AC1" printed on the back of the inverter. And vice versa) * L1 and L2 should be approximately 120Vac. L should be approximately 240vac. But more specifically, all the inverter menu voltage readings should exactly match the corresponding oscilloscope actual measurements. * "Vdc Over Vol P3003 2600" setting apparently defines the emergency shutoff voltage if for some reason the Prius decides to have too high of a voltage output. This setting is in 1/10ths of a volt. 2600 means 260.0 Vdc over voltage limit. This setting does not need to change. * "Vdc Lack Vol P3005 1880" setting apparently defines the under voltage emergency shutoff voltage in 1/10s of volts. 1880 probably means 188.0 Vdc. (Since the Prius is always on when the inverter is running, the Prius battery does not really need under voltage protection. So, to prevent the inverter from shutting off, it might be safe to consider lowering this setting to its lowest possible setting: 1841) * "Vdc Lack Resume P3006 2120" might be the DC input voltage needed to restart the inverter after an under-voltage fault shuts off the inverter). If so, 2120 might mean 212.0 Vdc. * "Iac L1 Correct P3019 1024" & "Iac N Correct P3018 1024" probably calibrates the inverter's current amp readings on L1 and L respectively. But I did not confirm this. These settings probably need to be used to calibrate the inverter menu amp readings to actual VacRMS measurements of the load measured with an oscilloscope. (Notice that there is no L2 current calibration. Probably this means that L2 amps is only the mathematical subtraction of L amps and L1 amps. L2 current reading accuracy is dependent on L and L1 both being calibrated accurately. ===