Posts: 96Registered Users ✭✭✭
Hi everyone.

I have a good understanding of electricity basics, especially with DC current. I built a few simple circuit boards in college. Since AC current can be much more complex, I've been trying to learn more about inductive and capacitative loads, impedance, waveform, etc.

I've been reading articles like this one, posted by @mcgivor in another post: http://www.electronics-tutorials.ws/accircuits/power-in-ac-circuits.html

When power is consumed and returned in inductive and capacitative loads, how does an inverter handle this "returned power" with respect to the DC side?

For example, let's say a capacitor draws 100w between 0 - 90 degrees then returns 100w between 90 - 180 degrees of the sine wave. The "real power" consumed would be zero, no net change. In the case of an off-grid system, is the inverter pulling the 100w then returning it to the battery? I'm eliminating the inverter tare load and efficiency for simplicity.
Current test system: 4-100w Renogy panels mono/poly, 1 string of 4 panels in series - 24v 100Ah AGM Battleborn LiFePO4 batteries - Morningstar MPPT40 CC - 1500W Samlex PSW inverter

• Posts: 2,837Registered Users ✭✭✭✭✭
My (limited) understanding is the "real power" of zero is useful work. In a real circuit the inverter still has to create the current, with associated losses, so less than 100% is returned to the battery.
Off-grid.
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
• Posts: 7,899Solar Expert ✭✭✭✭