Centralized 90 P.E. wastewater treatment plant for a remote safari camp in the Okavango Delta


This centralized system caters for a camp of 28 guests, 12 members of management and 35 staff members. The reticulation of waste from guest units, the camp kitchen and laundry and the staff village is achieved through septic tanks and pump tanks at these areas.

The main treatment plant consists of two 5000L final holding tanks in series followed by three ECOROCK-5000 units in parallel, allowing up to 15000L of water to be treated on a daily basis. Final effluent is treated by an inline chlorinator and sprayed into a set of sprinklers.

This treatment plant requires only 250W (to power the final submersible pump) and uses  less than 1kWh/24 hours.



We’re busy commissioning this new solar system for a safari camp in the Okavango Delta. The system will soon be fully operation when the camp opens, but for now the construction team is utilizing the power and we’re using this as a test run to see how the system performs.

All in all, this system will save the company hundred of thousands of Pula in fuel bills. The system will produce enough to handle the daily needs of the camp with a battery capacity to allow a full day of use on limited solar input. There is an automated 80kVA generator on standby for the rainy season (November to March).


Lithium ion upgrade


We recently upgraded the battery bank at Sango Camp in Khwai. We used a 16kWh 52V (310Ah) Blue Nova lithium ion battery to replace a 900Ah lead acid battery bank. So far, the change has been dramatic, with the batteries getting to a 100% SOC on a daily basis despite cloudy weather – mainly due to the efficiency (96%) of the lithium ion system compared to 70% of a lead acid battery.

New lithium ion battery installation

Lithium ion battery

16kWh Lithium ion battery

Just completed our first lithium ion battery installation! Quick, simple and space-saving!!

This 16kWh battery replaced a large bank of 12V lead acid batteries. 

Call us on 6864450 or email enquiries@the-solar-zone.co.bw to order yours!

Checkout our battery page for more info on what these batteries can offer!

Lithium ion (LiFePO4) batteries now available

BN range

Lithium Iron Phosphate (LiFePO4) battery technology offers a variety of advantages over Valve Regulated Lead Acid (VRLA) batteries:

  • Depth of discharge (DOD): LiFePO4 typically up to 90% vs 40% for VRLA
  • Physical size: more than three times smaller
  • Weight: more than four times lighter
  • Transport costs: more than three times lower
  • Cycle life: typically 4000 cycles (90% DOD) vs 1200 cycles (40% DOD)


  • 96% turnaround efficiency at C10
  • Fully rechargeable in 2 hours
  • Complete discharge in 1 hour
  • Energy density > 10kg/kWh
  • Operates beween -20°C and 65°C


  • Safety record of over 15 years
  • No gassing – no ventilation required
  • Non-toxic / ROHS compliant
  • 100% recyclable


  • 10 year product warranty
  • Can deliver more than 7000 cycles
  • Designed for 20 year service life
  • Automatically shuts down during fault conditions


  • Less than P2.50 / kWh  / cycle delivered
  • Zero maintenance costs
  • Efficient recharge saves more than 50% on generator runtime

Available for 12V, 24V and 48V systems from 1kWh to 260kWh!

Contact us on 6864450 or enquiries@the-solar-zone.co.bw to size your new or replacement battery bank.

Check out our website (www.the-solar-zone.co.bw) for more information.


Lithium ion – portable power

We have just received the first of a new range of lithium ion batteries. Because of their huge energy density, they now offer portable power in the smaller battery range.

Pocket rocketIMG_0048

This 13V battery only weighs 13kg and packs in the same amount of energy as a 200Ah (yes, all 65kg’s of it).

It’s portable, has easy screw-on terminals on top and even comes with a built-in volt meter!

As it is a lithium ion battery, you can use all 1000Wh, unlike lead acid which you should only use 30% ideally. Most importantly, it can be cycled 5000 times (at 80% depth of discharge or 4000 times 90%) compared to 1200 cycles of lead acid batteries of this size.

It also charges quicker – with a maximum charging current of 100A, means it can be fully charged in less than 2 hours!

Call us to pick up or order yours today!

The rest of the range includes batteries for 12V, 24V and 48V systems from 77Ah (1000Wh in the 12V system) to 1250Ah on the 48V for a massive 65kWh of usage power! At this level they are no longer portable but are 5 times lighter than a lead acid option and take up about 4 times less space.

Keep watching for more details on the rest of the range.

Remote monitoring

We’ve recently installed a Victron Colour Control (CCGX) unit for the solar system at our shop.

This amazing system is now logging all the data from the inverter, solar panels and batteries to the free Victron Remote Management (VRM) portal and allows us to monitor the state of the entire system.