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13. REVENUES (Details Narrative) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Deferred revenue	$ 220,602	$ 77,514
Product Deposits [Member]
Deferred revenue	174,836
Maintenance Fees [Member]
Deferred revenue	$ 45,766

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=evsi_ProductDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=evsi_MaintenanceFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: