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AC Coupled Battery Storage System

What is AC coupled system ?

AC coupled systems use a Solar Only inverter coupled to Hybrid inverter(s) and batteries.

Although simple to setup we consider it a Wast of an Inverter, and AC coupled Systems are less efficient at charging than a DC coupled systems, that are commonly 97% efficient.

AC systems are said to be very efficient for powering AC loads during the day and are able to be expanded with multiple solar inverters to form a Single phase or Three phase independent micro-power-grids.

However, why would you use a Cave-man Solar inverter, as a single or 3 Hybrid inverter will to a Better job, and Cost Less as you are eliminating the need for a Solar only inverter, and that will provide a Quicker Return-on-Investment (ROI) for all Off-grid or On-Grid systems.

We recommended all batteries be connected to one set of Bus-Bars, as that allows for Equal Charge & Discharge, as the Batteries Management System (BMS) automatically controls the Battery Charging.

Single Phase AC Coupled Inverter Wiring.

 

Three Phase AC Coupled Inverter Wiring.

(Click above images to see Larger images)

Advantages:

  • Slightly higher efficiency when used to power AC appliances during the day, such as air-conditioning, pool pumps, and power tools etc.
  • Most solar inverters have dual MPPT inputs, so multiple solar arrays can be installed at different orientations and Tilt angles.

Disadvantages:

  • Lower conversion efficiency when charging battery system from AC power.
  • AC Inverter are unnecessary, as a Single or 3 Hybrid Inverters provide 3phase power.
  • Generally Higher Installation & Wiring costs as additional Battery inverters needed.
  • Lower Electrical efficiency when switching Charging between AC & DC during the day.
 

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