In Regards to the Purchase Order Amount I found 2 articles within the last year, both having completed a 2.4MW operation.
1. https://www.solarnovus.com/2-4mw-solar-installation-on-the-anaheim-convention-center_N9201.html
This one was 5.4 Million. (Upper Bound)
2. https://www.solarpowerworldonline.com/2017/10/2-4-mw-new-york-solar-array-expected-provide-73-county-offices-energy-needs/
This one was 1 Million (Lower Bound) - however this was through a government grant.
In my own opinion this deal will be around 3 million. But, we will have to wait and see. Not bad for a company with a current market cap of 10 million. All of this is my own personal opinion and not financial advice.