Exhibit 99.4

Joint Filing Agreement

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all other Reporting Persons (as such term is defined in the Schedule 13D/A referred to below) on behalf of each of them of a statement on Schedule 13D/A (including amendments thereto) with respect to the common stock, par value $0.01 per share of EnSync, Inc. (formerly known as ZBB Energy Corporation), a Wisconsin corporation, and that this Agreement may be included as an Exhibit to such joint filing. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

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Signature Page

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of June 22, 2016.

SPI Energy Co., Ltd.	By:	/s/ Tairan Guo
	Name:	Tairan Guo
	Title:	Interim Chief Financial Officer
SPI Solar, Inc.	By:	/s/ Tairan Guo
	Name:	Tairan Guo
	Title:	Director