Whether a single office, residential, sectional title, or a large factory, PV Consult advise clients to make an informed decision on the type & size of system to meet their needs.
- kWp / kWh Size Analysis
- Off Grid Solar
- Extended Load Shedding
- Upgrades to Solar
Download Our Latest Load Shedding Brochure
Stand-alone OFF GRID
HYBRID Inverter Size & Type
3 2 4 Battery Size in kWp / kWh
Integration with Solar
Stand-alone OFF GRID
How loadshedding works
Solutions come in different configurations according to each client’s requirements. Ranging from a basic stand – alone UPS, to a fully integrated battery or Gen Set solution.
It is critical to distinguish between “Emergency Items” such as LED Lights / PC’s, Printers and heavy consumption items, such as Air Conditioners, Ovens, Geysers, Pool Pumps and Heavy Machinery. The key is to reduce the load profile to essentials only. We consult on your load profile and specify the emergency circuits and how best to integrate a UPS / Load Shedder within the budget
- In certain instances new wiring (reticulation) is advised
Off Grid / Hybrid Integrated system.
Upgrade of kWP (Peak) / More Items Upgrade kWh Battery / Extended Load Shedding
kWp (Kilowatt PeaK )
kWh (Kilowatt Hours
Centralised vs Decentralised
DB (Distribution Board
This means wiring / distribution of electricity
UPS (Uninterruptible Power Supply)
Grid Tied (Inverter)
Off Grid ( Inverter)
Gen Set (Generator)
Means a diesel engine combined with an electric generator
LV / HV
Low voltage batteries for normal residential use, high Voltage batteries used for high peak items e.g a lift or motor.
Basic stand-alone UPS can be integrated with DB
Single inverter battery box integrated to DB typically 5-10 kWp, 5-10 kWh
Duel inverter battery box integrated to DB, typically 10-20 kWp, 10-20kWh
Key benefits Hybrid vs Off Grid Configuration.
These are available as either single or 3 phase and are best suited when integrating with solar. Typically twice the cost of grid-tied
When not using the battery for loadshedding the batteries can be cycled at specific times and the power is then input into the system, hence saving on purchase kWh from the municipality.
It is possible to integrate Gen Set with a Grid Tied system and this can assist with reducing the Gen Set speed and save fuel.
During day time load shedding, the solar panels, will power the batteries and inverters.
Commercial and Section Title – Considerations
A battery solution is unlikely to be effective
A GEN SET with integrated solar is the most widely chosen configuration.
A battery solution for the office and emergency lighting only is advised.
Office Blocks/Business Parks Options Include:
A central battery / Gen Set attached to the ENTIRE DB and all users have FULL access.
As above but a selected number of circuits are installed.
This could be OFF-GRID or HYBRID at extra cost
Recommended decentralised option include:
A decentralised approach with each user securing their own standalone (OFF-GRID / UPS ) system according to their needs.
Certain sections could be upgraded to HYBRID if roof available.
Key Inverter Options.
Battery and Inverter (Combined)
Battery and inverter size is considered a two fold decision.
The amount of output (Peak) that is required to operate the consumption profile at any one point in time from all the items that may be operational.
The total draw of all items combined over a period of time (measured in kWh) killowat hours, that you need the items to opertate. Typically, under stage 2-4 loadshedding then a 2-2,5 hour battery time has been considered sufficient.
Lithium-ion battery backup systems, these start at 1000Wh or 1kWh. Come with 10 year 6 000/10 000 Cycle warranty.
Unlike lead-acid and gel variants, lithium ion batteries have a significantly greater depth of discharge and logevity without risking a loss of battery capacity.
Reticulation to rewire only essential / emergency circuits to the loadshedder
To be confirmed after the technical site visit.
Clients should be aware that reticulation can be an extra charge, if required.
Typical Electricity Usage Per Appliance Per Hour
When using your battery it is advisable to determine which appliances are most required, to give you the maximum amount of power during load shedding. Appliances such as air – conditioners / heaters and pool pumps ideally should not be run during load shedding.
*All Proposed Labour / Installation Costs Are Estimated And Subject to a Final Site Visit*
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