Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2130
| Posted: 04:55am 14 Apr 2025 |
This is running really well and tracking AC kWh meters correctly.
As many have found, the Solar regulators are a big source of Noise on the DC Bus, and last night with no solar and Load power under 520 Watts, the DC wattage on my monitor, minus Idle power and Efficiency loss was tracking AC Wattage perfectly.
The Monitor current sensors match my Clamp meters, I have few, and the DC voltages are accurate to within a 100mv.
These readings are very stable on the Monitor, even with all Solar chargers running, but with the Chargers off, the last digit is stable and I can compare the AC and DC Power readings to within a watt or two.
I have programmed the monitor to allow me to enter two values, 1: Idle power and 2: Expected Conversion loss for DC to AC generation.
The monitor displays % of total Inverter loss and Conversion loss %.
Obviously these two entered values can be changed and Conversion loss is adjusted to change the % of total loss to match the DC and AC accumulated kWh over time.
As expected, efficiency drops as AC power consumption gets closer to Inverter Idle Power.
I'm starting to see the Conversion loss value I entered stabilizing as more hours are accumulated, and it appears that this might give me a good indication of overall efficiency.
My only thought was, the Idle power comprises Inverter electronic loss, which may not change much, and Toriod magnetizing loss, could the Idle Toroid magnetizing loss change with load?
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Edited 2025-04-14 15:17 by KeepIS