MrTony32: HOW TO KNOW THE CAPACITY OF INVERTER/UPS TO CARRY YOUR LOAD To do that you will need to know first the total load in your house. Supposed you have: 1. TV 50"....60w 2. Decoder ...25w 3.fan 62".....80w 4. 10 lights each 25w.x10=250w
Total power ...415w What is the capacity of ups/inverter to carry the load (415w)
We divide the the power load (415w) by one of the standardd power factor (0.8, 0.7,0.6) That will give us ...415/0.7 =519va
Therefore we will need 600va or 650va inverter/ups to carry the load.
Note that It is recommended to chose inverter/ ups bigger than the one we need.
HOW TO CALCULATE BATTERY BACKUP TIME. supposed we have 2 batteries of 200ah/12v and a total load 415w. How many hours will the battery last?
Firstly multiply the battery voltage by the amp hour. 200ah x 12v =2400wh x2 =4800wh Divide by the load ..4800wh/415w =11hrs.5min
Our backup time will 11hrs.5min but due to the battery can not drop to 0% to prolong the battery lifesspan we will maintain the battery DOD to 50% that will give us 6hrs.
HOE TO CALCULATE INVERTER /UPS CHARGING CURRENT.
Firstly find out the inverter vdc(voltage direct current) which is usually ranges from 12vdc-180vdc above
If my inverter/ ups is a 12v ( that is for one 12v battery) the charging current will be 10% of the battery ah. That is 10/100 =0.1 0.1x 200 = 20a.. Therefore a 12v inverter of any given capacity charging 200ah battery has about 20a charging current.
HOW TO CALCULATE CHARGING TIME that will be battery ah divide by charging current.
200ah/20a = 10hrs
HOW TO CALCULATE NO OF SOLAR PANEL FOR YOUR BATTERY suppose you have one 200ah/12v battery and u need solar to charge in the absent of power supply. It is simple. First know your battery charging current as calculated above 200ah battery charging current is 20a and the battery is 12v.
Power is v x a i.e 12 x 20 =240w
We need 240w solar panel to charge our battery Note it is recommended we use panel bigger than the one we need in this case we will need 480w panel for proper charging .
Tonyteque services ltd ...the service you can trust
Our services include installation, sales and maintenance of all kinds of 1 inverter 2 solar panel 3 cctv 4 electrical
