What is the difference between a Pure Sine-wave Inverter a Modified Sine-wave Inverter?
The output voltage of a pure sine-wave inverter is continuously and smoothly changing between a minimum and maximum value with a single instance at which it reaches 0v during each half cycle.
Conversely a modified sine-wave output voltage jumps almost instantaneously between the minimum and maximum value and rests for a short period at 0v
Power supplied as a pure sine wave form is very similar to the power supplied by the electricity supply company, Eskom in our case.
Which Should I Use?
Because there are far fewer harmonics with a sine wave power supply compared to a square wave power supply, equipment typically runs cooler, quieter and more efficiently.This is not always noticeable with lighting with LED lighting for example but can be noticed with certain fluorescent lights.
These harmonics also tend to cause interference with TV pictures for example.
Anything with motors such as washing machines, fridges, pumps and fans etc. are often noticeably noisy when running on square wave of modified sine wave inverters.
If you want to be assured of complete flexibility with what you can run on your backup systems, a Pure Sine wave inverter would be the best choice. If you just want some Light and the TV during Load Shedding a Modified inverter is quite adequate.
Which devices are not suitable for use on a Modified Sine-wave Inverter?
Some other examples of devices that may not work properly with modified sine wave inverters include but are not limited to the following:
| Battery Chargers |
| Ceiling fans with Speed Control |
| Certain RF intercom devices |
| Clock radios, alarm clocks, or devices with built in clocks. |
| Electric Razors |
| Fluorescent lights |
| Laser printers |
| Light dimmers |
| Photocopier |
| Sewing machines with microprocessor speed controls |
| Some types of Alarm sensors |
Complex Friendly Load Shedding Solutions
No Diesel No Noise
Back-up System 1
Lights* LED TV and DSTV decoder for up to 4 Hours during load shedding
1 x 1000W Modified Sine Wav
e Inverter
3 x 100Ah Batteries
1 x Battery Charger
1 x Connection to House DB board for automatic cut over**.
* up to a maximum of 100W (i.e. 5 X CFL)
** subject to site inspection
Guide Line Price R21, 500.00 Incl. VAT & Installation
Contact me to arrange a site Inspection.
Back-up System 2
Lights* LED TV, DSTV decoder and Fridge, for up to 4 Hours during Load shedding.
1 x 1500W Pure Sinewave Inverter
4 x 100Ah Batteries
1 x Battery Charger
1 x Connection to House DB Board for automatic cut over**
* up to a maximum of 100W (i.e. 5 X CFL)
** subject to site inspection
Guide Line Price R35, 500.00 Incl. VAT & Installation
Contact me to arrange a site Inspection.
