Last edited: March 2019

Buying a Solar Power System in Ghana

Step 1 – Selecting the solar company

There are many companies in Ghana that sell solar power systems, as you can see on this page. When buying a solar power system, the first step is to ensure you are contacting a company which is providing the services you require. On this page, you find the different types of systems.

In case you want SmartSolar to bring you into contact with a suitable supplier, please use this contact form.

Step 2 – Stating your preferences

In order for the solar company to be able to ask you the right questions later, it is important for them to know about your expectations. It would be good to first think about:

  • Performance of the system – When during the day or week do you need power. Do you want power 24/7? In this case, how critical is it that you can always rely on the system (even when there are lots of clouds).
  • Timeline – What is the time frame for installation of the system? Not that, especially for larger systems, often components need to be imported from outside the country.
  • Budget – If you have a set budget, it could be good to share this in advance. This way you make sure the company proposes a system aligned with what you can pay. In case you share your budget, make sure you ask for multiple quotes from different companies.
  • Financing – Some companies provide options to finance your system. They might pay for the system or for the electricity it produces over a set time period. If you are interested in a financed system it would be good to mention this.
  • Time horizon – Do you want a system that lasts for the coming 2, 5 or 15 years?

Step 3 – Data collection

After your preferences have been stated, the solar company should ensure they gather sufficient information and data so they can start the design of a system that meets your requirements. You can help the company with giving them extra information on:

  • Energy usage – For a proper system design the energy usage is the most important figure. The best way to determine energy usage is always to measure it! In case you are grid connected you can use your utility bills. If you are using a diesel generator you can use the meter on the generator or base the energy usage on the diesel consumption. If this is not possible, you can estimate the energy usage by performing a load analysis. In its simplest form, a load analysis multiplies the power rating of each appliance you use and multiplies it with the amount of hours it is used. The sum of all appliances provides you with your daily energy usage.
  • Time of use – Aside from the length of using your appliances, it is usually also relevant to know when you are using the appliances most. If most of your energy consumption occurs during the day you will require a different system compared to usage during nighttime. Furthermore, the seasons influence the system. If you use, for example, more energy during the rainy season you will need a system suited for this.
  • Future plans – Often it is much more expensive to upgrade a system in the future compared to building a slightly larger system from the start. Make sure that the solar company knows about any expansion plans you might have.
  • Location of components – Especially for larger systems the solar company should plan a site visit. During this visit the technician can determine which location or roof is best suited for the solar modules (along with pitch & orientation). Besides this, it also should be determined where the batteries and other equipment will be located in order to make proper estimates with regards to the cable length and diameter.
  • Communication – In order to include remote monitoring, you will either need to provide an internet connection (wifi/LAN) or have a GPRS signal from a telecom operator.
  • Existing infrastructure – Determine the quality of the existing infrastructure, as well as the potential existence of a backup generator. Check if the current wiring can be used for a future system.
  • Maintenance – Are there normally technicians or people around already performing maintenance on other equipment?
  • Location – The solar company will need the exact location of the project in order to match it with local/regional weather and irradiation data.

Step 4 – System design

Based on all the gathered input it is now up to the solar company to come up with a solid system design. The system design also provides the input for the quotation.

A (slightly outdated) overview of the steps taken in designing an off-grid system can be found in this guide from African Energy here.

Step 5 – Comparing quotations

Comparing different quotations can be tricky. Depending on your own level of expertise and the total order value you could consider getting assistance in reviewing the quotations. SmartSolar (contact us) has been reviewing quotations for many years and can provide you with the necessary insight to be able to make an informed decision.

Step 6 – Installation

Normally the solar company will start preparations for the installation after receiving a down payment. Please note that not all materials are stocked by solar companies in Ghana. Especially concerning larger batteries, it can take extra time as they are normally only produced after the order is made.
After installation, ensure that you are given a proper explanation of the whole system and that the relevant people are training in the daily operation and maintenance of the system.

Step 6 – Remote monitoring

For larger systems and for systems which have a critical function it is strongly recommended to ensure that at least the inverter is connected to the internet. This ensures that both you and the solar company which installed the system can regularly check whether the system is behaving according to expectation. If there is no internet, you can often still monitor the system locally by using a monitoring device. With monitoring it is possible to:

  • Remotely identify (and sometimes fix) current or potential issues with the system
  • Plan the use of appliances with the remaining battery capacity
  • Get automatic messages in case your batteries are running low
  • A history of high-quality data to see whether it is necessary to expand the system

Step 7 – Service and maintenance

Lifetime of a solar power system

The lifetime of your solar power system very much depends on the use of the system, the brands used and the settings of the different components. Generally speaking, you should be able to expect the following lifetime if you are using high-quality brands and are performing occasional maintenance:

  • Solar Panels: 25 years, all Tier-1 solar panels are made to last a long time
  • Batteries: 3-8 years for Lead-Acid and 8-15 years for Li-Ion
  • Inverter/charger: 5-10 years
  • Charge Controller: 5-10 years

Service and maintenance of off-grid solar power systems

A solar power system using Gel batteries or Li-Ion batteries does not need much maintenance. It would be good to clean the solar modules once in a while (with a soft cloth and ideally demineralized water). Aside from that, it is advisable to have a solar company come by to check all the connections and check the voltages of the batteries. In case of flooded lead-acid batteries it would be required to perform equalisation charges at regular intervals and to top up the battery water. In case you can not do this yourself, it is good to have the solar company come by at more regular intervals.

In case a generator is integrated into the solar power system, this part of the system would require more maintenance. Aside from the daily checks, it would be required to change the oil and filters at regular intervals (generally every 250-500 running hours).

Service and maintenance of a grid-connected solar power systems

Aside from cleaning the solar modules (in case this is necessary), a grid-connected solar power system without batteries does not require any regular service or maintenance.