Programming VSP, GPM and cost per month... Check my numbers please

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I

iamomeed

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Feb 6, 2017
51
houston, TX
I installed a new vsp 3 weeks ago and last week a flow vis flow meter.

I read on another thread to keep the GPM between 30 and 50 for effective skimming. The default settings had it at 65gpm on the high and around 15 on the low preprogrammed schedule

So my pool is 13000 gallon and I'm going for 1 turn a day.

So 2650 rpms gets 895watts... Costing $4.84 per month at 9cent/kw
47gpm for 2 hrs=5640 gallons . I need 2 hrs on high for the Booster pump to run the vacuum.

1900 rpms@372 watts.... Costing $4.02 per month
31 gpmx 4 hr=7449 gallons
Total 13080 gallons per day costing $8.86/month

My old 2hp single speed I was running for 8 hrs at 3450 rpms.
Costing me about $33 a month.

I never calculated gpm on the old unit. I was just told to run 8 hrs. So I never really tweeked it properly.

What do you think
 
GPM is not needed. Run the pump long enough and at as high a speed as necessary for what you want to do.

Skimming takes fairly minimal flow rates.

Most pumps can be run for 4 hours or even less per day. Depends on how you chlorinate. SWCG can dictate how long to run the pump to generate chlorine. If adding liquid chlorine, takes less than an hour to distribute it within your pool.

See Pool School - Determine Pump Run Time
 
mknauss said:
GPM is not needed. Run the pump long enough and at as high a speed as necessary for what you want to do.

Skimming takes fairly minimal flow rates.

Most pumps can be run for 4 hours or even less per day. Depends on how you chlorinate. SWCG can dictate how long to run the pump to generate chlorine. If adding liquid chlorine, takes less than an hour to distribute it within your pool.

See Pool School - Determine Pump Run Time
Click to expand...
Thank you. I'll check it out but The link you posted was for chemicals....
 
I doubt you need to run the pump on high to satisfy the booster pump. They don't actually push a bunch of water, they just push it at high pressure. You can always just try it and see what happens.

On your calculations, it seems fine, though I think the energy use of your old pump is optimistic. Most 2hp motors I've seen use 10-11 amps @ 230v, which @ $.09/kwh is $50-55/mth. You're underestimating your savings.
 
I,

I used to have three programs for running my SWCG and Skimming... 1200 rpm, 1500 rpm and 2000 rpm...

I found that there was almost no difference in how well the skimmers worked between the three speeds...

I now only use 1200 rpm, because anything less than that will not ensure that my SWCG's flow switch will turn on..

There is no magic number that fits every pool.. you have to just experiment and find what works best for you.

Just keep in mind that the idea that you have to have x turnovers a day is just an old myth and not really needed...

I personally love my VS pump and I suspect you will also...

Thanks for posting,

Jim R.
 
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