THE BACK-UP SOLUTION
PURE Sine Wave Inverters have very little harmonic distortion, is totally clean power exactly the same as generated by power plants and have no adverse effects on electrical appliances. It will not cause erratic motor behavior or weird sounds from monitors, fluorescent lights, microwaves or fridges. They are generally much more efficient than MODIFIED SINE WAVE inverters thus producing more power for longer. Their only disadvantage is that they are more expensive.
- Never fully discharge the battery. Doing so will drastically shorten its life expectancy. - Optimum battery temperatures should be between 20° and 30° Celsius. - Charge rates are usually at C0.1 meaning that it will take 5 hours to replenish a half drained (50%) 100A battery. - The mid quality Deep Cycle battery in the example below has a 5000 (14 year if discharged every day) cycle design life rated at 10% DoD (Depth Of Discharge). This means that it will last for 5000 charge and discharge cycles only if no more that 10% is discharged from the battery with each cycle. Discharging the same battery to 50% DoD each time yields as little as 1000 cycles. Discharging to 80% DoD (20% remaining) yields as little as 500 cycles and discharging to 100% DoD (0% remaining) yields 300 cycles and my cause the battery to fail outright. life cycles of lower quality batteries in blue below is clearly far less. These batteries are used for UPS and back-Up power systems since they don't discharge every day. Remember that these batteries are rated in charge and discharge cycles not days.
I) Calculate - What you would like to power during outages. Check the appliance's labels for power consumption in Watts (per hour). Add all these together eg. TV (200W), Lights (60W), Computer (300W). 200+60+300 = 560W. (this will be the minimum inverter size). II) Calculate - How long the appliances should be powered for in hours. Lets use 4 hours. III) Multiply the above in step I with the amount in step II then multiply by 2 to ensure that the batteries will not be depleted below the 50% mark. (560W x 4Hours = 2240W) (2240W x 2 = 4480W)
HIGH QUALITY BATTERIES EXPECTED LIFE CYCLES: 2x 100AH/12V (2400W) batteries, load shedding 4 hours 3 times per week = 1 Year (300 cycles) 4x100AH/12V (4800W) batteries, load shedding 4 hours 3 times per week = 3.1 years (500 cycles) 8x 100AH/12V (9600W) batteries, load shedding 4 hours 3 times per week = 15 years (4000 cycles)
2x 100AH/12V (2400W) batteries, load shedding 4 hours 3 times per week = 0.5 Year (100 cycles, may fail sooner) 4x100AH/12V (4800W) batteries, load shedding 4 hours 3 times per week = 1.7 years (270 cycles) 8x 100AH/12V (9600W) batteries, load shedding 4 hours 3 times per week = 6 years (1000 cycles)
1x 1KW PURE SINE WAVE high quality inverter = R10,000 4x 100AH/12V entry to mid quality batteries = R10,000
Installed with single dedicated 3 pin wall outlet - R2650.00 |