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12. REVENUES
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
REVENUES

12. REVENUES

 

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

 

 

   For the six months ended June 30, 
   2018   2017 
Product Sales  $3,706,103   $874,819 
Maintenance Fees   3,789    – 
Professional Services   10,575    3,600 
Total Revenues  $3,720,467   $878,419 

 

At June 30, 2018 and December 31, 2017, deferred revenue amounted to $70,724 and $77,514 respectively. At June 30, 2018, the Company has received an initial deposit to plan and manufacture two Solar Tree® units in addition to deposits for multi-year maintenance plans for previously sold products. As of June 30, 2018, deferred revenue associated with product deposits are $26,304 and the delivery of such products are expected within the following six months, while deferred maintenance fees amounted to $44,420 and pertain to services to be provided through the second quarter of 2022.