1. TYPICAL DROPDOWN OFF-GRID SITE
(Kalahari Projects)
These sites could expand to several solar structure modules and several containers.
Dimensioning very much depends on:
* The load requirement
* The battery autonomy required
* Whether grid, wind turbines or generators are available
* Sufficient space is available
* Customer budget
2. TYPICAL DROPDOWN OFF-GRID SITE
For single container sites, the container is normally partitioned in 3 parts:
1. Equipment room
2. Battery room
3. Generator room
20ft or 40ft shipping containers are cladded with polystyrene and Chromadeck or Stainless steel depending on customer
requirement.
Outer Wall thicknesses are normally 80mm.
Inner wall thicknesses are normally 50mm.
3. TYPICAL DROPDOWN OFF-GRID SITE OR OFFICE
For single container sites, the container is normally partitioned in 3 parts:
1. Equipment room
2. Battery room
3. Generator room
The drawings below shows the 40ft container version.
Sometimes additional containers with battery banks are added for larger sites / offices.
4. TYPICAL DROPDOWN OFF-GRID BTS OR TRANSMISSION SITE
Foundations for Towers and Monopoles can be
1. Above ground concrete blocks
2. Under ground Grillage foundations
3. Underground casted foundations
5. TYPICAL DROPDOWN OFF-GRID BTS OR TRANSMISSION SITE
For rural applications and small sites – small to large cabinets are sometimes required:
6. TYPICAL GENERATOR ONLY SITE
Co-located BTS site with 16kW average customer load.
3 x 4kW average per phase Generator optimised system with SMC batteries are combined an run of a 65KVA Generator to
allow for rapid charging.
Since these batteries are 10 000 cycle batteries, with a very high charge acceptance rate, they are partially charged 3 times
per day for approximately 2.5hrs per cycle.
During this time the site runs directly from the generator and the batteries are charged off-line at a rate of approximately 30%
of their full capacity.
Every 40th cycle, a full top of charge is done to reset the SOC calculators.
7. MOBILE APPLICATIONS
1. Transmission site trailer – towed by Land Cruiser or similar
2. Full capacity BTS site with Transmission and 35m mast – towed by a large truck.
9. SITE BUILT WITHOUT ANY USE OF CONCRETE
Site is built on a steel frame and levelled with jacks.
Rocks are used as ballast and to fill up inside the fenced area.
SITE
