Marc Christian's posts

Posted by Marc Christian on Nov 18, 2014 07:42 pm

#1 - Renewable Energy > Technical Discussion: Solar Water Pumping > Re: Battery bank for swimming pool

Thank you.

The reason why my calculation was w/o inverter is that in Spain they avoid using those and simply add an oscillator.
So I did the calculations to check where the benefit could be in doing so. Other than the % loss because of the inverter I do not see an immediate advantage indeed.

A good day to you,

Posted by Marc Christian on Nov 13, 2014 09:41 pm

#2 - Renewable Energy > Technical Discussion: Solar Water Pumping > Battery bank for swimming pool

Is this calculation right?

i have a pool with a 1hp pump - or 743W, say 750W

Following the method on this site:

- pump only: 750W, working 10H full time: 7500 Wh/day
- 2 days back up: 15000 W
- Depth of Discharge: 40%: 15,000 Wh/40% = 37500 Wh
- Temperature factor: 1 37500Wh
- System Voltage: 24V deep cycle batteries >> 37500AVh/24V = 1563 Ah (top up to 16750 Ah for calc)

say w/o inverter, just an oscillator, 24V and 250Ah batteries:

250 Ah: 1750Ah/ 250Ah = 5 such batteries in parallel
24 V: 220V / 24 = 10 strings in serials

That is 50 batteries for a 750W pump? My calculation must be wrong somewhere.

And how to calculate the bank if an inverter is to be used?

Thanks
Marc C

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