Transportable Solar-Electric System for a House or Cabin, Dual-Controller (Off Grid), $7500

This dual controller 2560W system is the same as the single controller 2560W system, with the following additions:

  • One additional professional Maximum Power Point Tracking (MPPT) 150V/60Adc charge controller,
  • An Ethernet hub/switch that networks the two charge controllers to laptop PC.
  • All mounting hardware for this additional equipment.

The picture below shows the two of these charge controllers wired together, with the battery and PV array disconnects and over-current protection devices. Also shown are the Local Area Network (LAN) cables that connect the two controllers to a laptop for monitoring and programming. As before, this is a fully-functional setup but shown here for visibility without equipment covers, conduits, etc, and the final installation needs to be done by the user in accord with all applicable electrical codes.


The difference between this dual-controller true 2560W system and the single-controller 2560W system is that here all the available PV array power is processed all the time (as opposed to just on cloudy days). So, this system is much more efficient in utilizing the whole 2560W PV array.

Here, the PV array is split evenly between the two controllers, with 1280W connected to each controller. Of course, these arrays may be expanded well beyond 1280W, with the additional input power benefits.

Both controllers are programmed to perform synchronized charging of one battery bank. Their outputs are connected in parallel, and to the battery bank. Note that while these controllers are synchronized at their back-ends, their front-ends may be connected to two completely different PV arrays, thus giving the user freedom to choose different solar panel brands, panel Wattages, array orientations, etc (here the two PV arrays are the same, but they don’t have to be).

Both controllers are LAN-networked to a laptop PC using the MODBUS over TCP/IP over Ethernet protocol. This allows the owner to concurrently monitor the performance of these two charge controllers in two separate windows on one laptop screen. A web-browser-based interface used to monitor and program the controllers is also provided, along with remote access over the Internet, and also email alerts.


Copyright © 2013-2017 Jack Borninski. All Rights Reserved.


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