Solar array installed along a long-span roof by Prenniex

Power systems · Solar and storage · Electrical installation

Power that holds when the grid doesn't.

Prenniex designs, supplies, installs and maintains solar and inverter systems for homes, businesses and institutions across Nigeria — sized to a load we have actually measured, and installed by our own crews.

Get a free quote See system sizes

Free site visit and written quotation 100+ installations completed Lagos · Ibadan · Akure · Ado-Ekiti

15 yrsIn solar and power engineering

100+Installations completed

103.5 MWpSolar capacity delivered

83 MWhStorage capacity delivered

Capacity delivered includes four UN-sponsored solar farm projects on which our engineers worked as contributing engineers. How to read these figures.

What we do

Solar, storage, and the electrical work that carries it.

Most installers stop at the inverter. We do the distribution, the protection and the switching as well, because that is where a system either lasts or starts giving trouble in the second year.

Solar hybrid systems

PV array, hybrid inverter and automatic switching between solar, battery, grid and generator. From a single home up to a multi-floor building.

Battery storage

Lithium and tubular banks, new installations and retrofits onto inverters that are still sound. Sized against your evening load, not the brochure.

Electrical installation

Distribution boards, DC and AC protection, surge devices, changeover, load separation, cabling and earthing — done by us, not subcontracted.

Security and automation

CCTV, access control, intercom and automated gates, on supply that is backed up and protected so the system does not go down with the light.

Energy audit and survey

We measure what your building actually draws, hour by hour, before anyone quotes a system size. It is the step most often skipped.

Maintenance and support

Servicing, array cleaning, battery health checks, settings review and fault attendance — for our installations and for systems we inherit.

Solar street lighting

All-in-one and pole-mounted street lights for estate roads, compounds, car parks and perimeters. No cabling back to a board, nothing added to your load.

Solar water pumping

Borehole and surface pumps running off their own array, filling the tank by day. Most installations need no battery at all.

All services in detail

Who we work with

The same method, at every scale.

A three-bedroom flat and a nine-storey office building are the same problem at different sizes: find out what the load really is, size for it honestly, and install it so it can be maintained.

Homes and estates

Whole-house and essential-load systems, and estate-wide standards.

Offices and commercial

Shops, branches, offices and multi-tenant buildings.

Industrial

Factories, workshops and warehouses with heavy motive load.

Rooftop array on an institutional building

Institutions

Schools, clinics, places of worship and public buildings.

Multi-inverter installation in a corporate building

Corporate buildings

Multi-storey installations, floor by floor, in occupied premises.

What we install for each

System sizes

Where most people start.

These are the configurations we install most often. Every one is confirmed against your own load before it is quoted — the sizes below are a starting point for the conversation, not a menu.

2.5 kVA Flat or small home

Inverter: 2.5 kVA pure sine wave
Storage: 2 × 200 Ah tubular
Array: 6 × 300 W

Typically runsLights, fans, TV, decoder, laptops, phone charging and a small fridge.

3.5 kVA Family home

Inverter: 3.5 kVA hybrid
Storage: 5 kWh lithium
Array: 8 × 320 W

Typically runsEverything above plus a full-size fridge-freezer, pumping set, and a bedroom air conditioner for part of the night.

5–10 kW Large home, shop or office

Inverter: 5–10 kW hybrid
Storage: 10–20 kWh lithium
Array: 10–20 modules

Typically runsMultiple air conditioners, a small server or POS setup, office equipment, freezers and borehole pumps.

15 kW + Building or multi-floor

Inverter: 15 kW units, paralleled
Storage: 20 kWh and upward per unit
Array: Roof, ground or canopy

Typically runsWhole floors or wings, with each floor able to operate independently of the others.

Full sizing guide

How we work

Five steps, and you can stop after any of them.

Enquiry and site visit

You tell us the building and what troubles you. We come and look. No charge, no obligation.

Load assessment

We list what has to run, for how long, and measure or log where it matters. This decides everything downstream.

Design and quotation

A configuration sized to that load, and a quotation with every item, quantity and rate shown separately.

Installation

Our own crews. Mounting, cabling, boards, protection and commissioning, with the premises kept usable throughout.

Handover and support

Walk-through, settings explained, warranties passed to you, and someone to call when you need us.

Why Prenniex

Four things that decide whether a system is still good in year five.

We do the electrical work ourselves. Boards, protection, changeover and load separation are not handed to a third party. Most system failures we are called to fix are distribution problems, not inverter problems.
Equipment is chosen for the site. We are not tied to selling one brand. What goes in is what suits the load, the space and the budget in front of us.
Warranties reach you intact. Manufacturer warranties are passed through in your name. We do not sit between you and the manufacturer.
Everything is labelled. Every board and every way is marked, so any competent electrician — not only us — can work on your system afterwards.

More about how we work

Labelled DC and AC distribution boards with surge protection and changeover

Equipment

What we install.

We work with equipment that can be serviced and replaced in Nigeria, and we will tell you plainly when a cheaper component is a false economy and when it is not. Where you have a preference, we will quote it.

Felicity SolarLVTopsunCworthBestcom SolarmacTubular & LiFePO₄ storageMono-crystalline PV

Supply

Buying equipment only.

If you already have an installer, or your own electrician, we will supply the equipment on its own — inverters, batteries, panels, mounting, protection and cabling — with the sizing advice included at no charge.

We would rather you buy the right thing from us than the wrong thing from anyone.

See what we stock

Utility scale

Four UN-sponsored solar farms.

Alongside our own installations, our engineers have served as contributing engineers on four solar farm projects sponsored under United Nations programmes. That is where the bulk of the capacity figures on this site comes from, and it is a different order of work from a building installation — larger arrays, formal design review, and delivery standards set by an international programme.

We state it separately because it should be read separately. The buildings, homes and premises described on this site are jobs we deliver end to end. The farm work is engineering contribution at utility scale, and we are glad to set out our specific role on any of them on request.

How to read our figures

Selected work

Installations, not renderings.

Client names are withheld as a matter of course. References and site visits can be arranged, with the client's consent.

Plant room with six parallel inverters and a hybrid storage unit

Commercial

Multi-inverter plant room

Parallel inverter bank with hybrid storage, dedicated DC and AC boards, and dressed cable routing in a purpose-cleared plant space.

Lagos

Industrial

Long-span roof array

Rail-mounted array across a profile-sheet roof, strung and routed to a ground-level inverter room without disturbing the sheet line.

Nigeria

Wall-mounted lithium storage unit installed beside an inverter

Residential

Lithium storage retrofit

Tubular bank replaced with lithium storage on an existing hybrid inverter, with load separation and new surge protection.

Lagos

See more work

Common questions

Before you call.

How much will my system cost?

It depends entirely on what has to run and for how long, and equipment prices move with the exchange rate. Anyone who quotes you a figure before asking what you want powered is guessing. Tell us the appliances and the hours, and we will give you a written price with every item shown.

Do I have to power the whole house?

No, and usually you should not. Separating essential circuits — lights, fans, fridge, sockets, pumps — from heavy loads like air conditioning and water heaters gives you far more hours of backup for the same money. We do that separation as part of the installation.

Lithium or tubular batteries?

Lithium costs more at the start, lasts several times longer, gives you more usable energy per naira over its life and needs no maintenance. Tubular is cheaper today and still sensible on a tight budget or a small system. We will show you both on the quotation.

What happens on cloudy days and in the rainy season?

Panels still generate in diffuse light, at reduced output. A properly sized hybrid system covers this by charging from the grid or a generator when there is not enough sun, so the batteries stay ready. Rain also washes the array, which helps.

All questions answered

Tell us what you need powered.

A site visit and a written quotation cost you nothing. You will get a real load assessment, a system sized to it, and a price with every item listed — not a lump sum.

Get a free quote Call 0706 079 3977