domain Should I renew Solarmobi.com

[Bonsu]

I am seriously considering if I should these 2 names and would like to seek honest opinions as I have done outbound on both names with no reply. Should I renew Solarmobi.com and BiogasEnergy.org?
Thanks

 

[Bonsu]

any reply please

 

[EZPZYO]

Please what is the general value of a 3 letter hyphenated name assuming it's a-b-c.com and another format is a 4 letter hyphenated name cv-cv.com if other extensions are taken and some are developed sites.

Thanks

Historic sales
L-L-L.com
CV-CV.com