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Thread: Generator Sizing

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    Generator Sizing

    Hello all,

    I'm looking at a SWG rated for 35,000 gal. My pool is an 42'x20' AG Aqua Leader pool. The pool calculator tells me my pool is 25,400 gal. I've read you should over size the SWG for longer service life and shorter run cycles. Given my pool size, will a 35k SWG be adequate to achieve those two goals?
    22,600 Gal, AG, 150 sq ft cartridge filter

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    Mod Squad Jimrahbe's Avatar
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    Re: Generator Sizing

    M,

    Welcome to TFP... A Great resource for all pool owners worried about size...

    We recommend a SWCG that is 2 times the volume of the pool. So, for a 25K pool we would recommend a 50K SWCG..

    As far as I know there are no 50K SWCGs, so that would mean moving up to a 60K model...

    Here is why we recommend always having a larger SWCG than you need... SWCG ratings are based upon running them 24/7, at 100% output. I doubt you really want to run your pump 24/7.

    A 35K rated SWCG will have to run much longer to generate enough chlorine for your pool than a SWCG rated at 60K.

    Thanks,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Re: Generator Sizing

    Thanks Jim!
    22,600 Gal, AG, 150 sq ft cartridge filter

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    Mod Squad jblizzle's Avatar
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    Re: Generator Sizing

    40K cell is about the minimum I would suggest and would likely need to run at 100% for about 11 hours every day.

    If you do not have a VS pump that is going to cost you a lot electricity..
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Generator Sizing

    Mr. Fixer,
    I'm in Florida, my pool is 29,900 (call it 30K) gallons, and is in full sun from morning until late afternoon (when the house starts to shade pool). So my pool size is in the same ballpark as your 25.5K pool. I have the Pentair IC40 rated for 40,000 gal. My CYA is at 80 ppm. Right now my FC daily loss is about 2 ppm, and I need to run my IC40 cell at 100% duty cycle for 9 hours/day (10am-7pm) to keep up and keep FC at 6 ppm. I'm worried that this cell won't have enough capacity once "real" summer hits, I'll just have to run it longer. I wish I had the IC60 cell, but I got what the builder gave me! Luckily I have a VS pump that draws only about 300 Watts at the speed required to run the cell. Good luck!
    Finished in 2017 - 30K Gal, IG, 60' x 11' Rectangular Lap Pool (4' to 6.5' deep) with attached Spillover Spa, Hydrazzo plaster finish. Pentair Equipment: Intelliflo 2 VST 3 HP VS Pump, CCRP200 Cartridge Filter, MasterTemp 400 NG Heater, IC40 SWG, TF-100 with SpeedStir and SampleSizer, K-1766 Salt Test, Dolphin S300i Robot Cleaner, Pool Blaster MAX Li Vacuum.

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    Re: Generator Sizing

    Thanks Jason!

    - - - Updated - - -

    I was looking at that model as well. Thanks for the heads up Mike!
    22,600 Gal, AG, 150 sq ft cartridge filter

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    Re: Generator Sizing

    After physically measuring my pool depth and finding it to be 48" not 54", I recalculated my pool volume to be 22,600. Do you think a 40k SWG would be sufficient given the decreased volume ?
    22,600 Gal, AG, 150 sq ft cartridge filter

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    Mod Squad jblizzle's Avatar
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    Re: Generator Sizing

    That is really only a 10% volume decrease so you would just be able to decrease the run times I reported by about 10%.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    bmoreswim's Avatar
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    Generator Sizing

    In IL, as in MD, 1.5x is fine. The sun isn't as strong and you will not have to run as long as noted above. It is different than lower latitudes.

    I rarely get above 50-60% for 12 hours. Which is only operating it for 1/4 of a day. I could run it at 100% for fewer hours but I like the additional skimming time.

    This is with my 70-80 CYA levels. Absolutely no harm in going bigger though.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
    Coverstar automatic pool cover | StoneMakers concrete retaining wall and decking | Merlin SmartMesh winter safety cover
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