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13. REVENUES
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
REVENUES
13. REVENUES

  

For each of the identified periods, revenues can be categorized into the following:

 

    For the nine months ended September 30,  
    2018     2017  
Product Sales   $ 4,642,428     $ 1,094,898  
Maintenance Fees     5,682       5,220  
Professional Services     10,575       3,825  
Total Revenues   $ 4,658,685     $ 1,103,943  

 

At September 30, 2018 and December 31, 2017, deferred revenue amounted to $220,602 and $77,514 respectively. At September 30, 2018, the Company has received an initial deposit to plan and manufacture two Solar Tree® units, a prepayment for two EVARC units, in addition to deposits for multi-year maintenance plans for previously sold products. As of September 30, 2018, deferred revenue associated with product deposits are $174,836 and the delivery of such products are expected within the following six months, while deferred maintenance fees amounted to $45,766 and pertain to services to be provided through the second quarter of 2022.