Formula To Determine System Size For Solar Panels

To figure out what size solar panel batteries charge controller and inverter you need follow the simple steps below.

Formula to determine system size for solar panels.

A solar array is producing 1 kw and charging a battery bank of 24v. The formula is simple. For total load of 500 w with operational time 24 h per day calculator gives size of invertor about 555 kw. You ll need 6 2 kw dc according to the formula.

That is the total energy you will need. Take the power produced by the solar panels and divide by the voltage of the batteries. 1000 wh 5 2000 wh. Calculate how much energy is needed.

50 5 depth of discharge remember the less discharge the longer the batteries last but the more cost 5. How to choose the right solar inverter size for your solar power system. Plug the answer from the previous step into the following calculation which accounts for standard energy losses of solar pv systems kw x 1 3 increase size of pv system by 30 kw actual size of pv system you need e g. 1 day autonomy just an example 3.

Find your minimum string size. Renewable energy installers recommend sizing your system for twice the true amp hours determined in step 2 above. You calculate how many solar panels you may need by dividing the maximum hourly solar energy system output by the wattage output of one single panel. 3 x 1 3 3 9in this example you would need a 3 9 kw solar pv system to satisfy your home s energy needs.

First we want to calculate the minimum number of panels we should put in a string. Sizing a solar inverter is an important part of any solar installation big or small. 1000 wh x 1 1000 wh replace 1 with days autonomy for your own calculations 4. 1000 wh needed for 1 day 2.

The controller size is then 1000 24 41 67 amps. 270v 39 28v 6 87. For that take the low end of the mpp range in this case 270v and divide by the vmp of the panel 39 28. This will double our estimated amp hour needs and ensure we stay below 50 dod.

2 amp hour requirements from step 2 in our example system from step 2 the battery bank should be 12 v and 168 ah 2 84 ah. 33 kwh 6 1 sun hours x 1 15 efficiency factor 6 2 kw dc solar system size required using the example above with a 6 2 kw dc system you can multiply this number by 1 000 to confirm that you need 6 200 watts of solar panels. I tried to use this calculator for sizing solar panels in hybrid system for micro gsm bts but size of invertor is too big for total load of 500 w. 100 watts x 10 hours 1 000 watt hours.