DG Set Capacity Calculation

30-50% more than those all added together?

Why not pose this question directly to the potential suppliers of the gen sets? Our crystal ball is presently in use.

Convert tonns to BTU then convert to KWh, roll it all together and there ya go!

Ask a supplier!!!!!!!!!!! Get a good answer.

Depending on manufacturer, each AC condensing unit will be about 1.5 KW. Thus the total is about 6.5 KW. In addition, for starting you need a reserve of about twice the largest motor; i.e, another 3 KW. This sums to 9.5 KW, which could be rounded to 10.

This estimate can be refined by knowing the exact KW of the ACs, from the manufacturer. If you are contemplating future expansion, you can go larger.

15kw...

42!

Ahh, a futurist, planning for expansion!

As the response given by redfred is The Answer to the Ultimate Question of Life, The Universe, and Everything, I agree, and also suggest 42.

Unless I have misinterpreted your answer, and instead you refer to a '42 Henway. If that is the case, then I would say Six by Nine (which is also 42) is the answer.

^{It's about time for this again, isn' it?}

OK, i'll bite....whats a Henway?

^{_{Preferably a Tandoori chicken}}

"OK, i'll bite....whats a Henway?"

About 3 and a half pounds...

Thanks to kvsridhar for being the straight man!

DG set should be able to take the starting KVA. The starting KVA for lights and fans which will come on immediately will be 2.35KVA at 0.85PF. The split units will come on after a time delay. Assuming that all will time out simultaneously, the starting load could be about 1.5 times the running load. the running load is about 1.8KW for each unit. Thus at 0.85 PF the total staring KVA for the split units will be 9.53KVA. The total starting KVA will be 9.53+2.35=11.88 KVA. The DG sets are sized for .8PF and hence a 10KW set should do, but I will go for another 25% derating and go for a 12.5KW set.

Well, that was amusing; part right but part weird.

Eeenie Meenie Chili Beany the spirits are about to speak....

The SEER rating of your air conditioners is 42.

That is all.

Type of HVAC? Heat pump? Split system? Gas Pack? Is there suplemental electric heat circuitry? If so, the HVAC unit KW usage cannot be based strictly upon the BTU ratings. The current will be significantly higher when the heating elements are in use and you will need to add this load into your calcs. Check the equipment nameplate for the required power consumption rating on each of the units. If you do not physically have the units in your possesssion, contact the manufacturer and get the IOM and technical DATA sheets. Add all of the loads together then add 25% of the total for unexpected condtions such as line voltage drop, mechanical issues, and ambient temperature changes that are out of the equipment design range.