My AGMs cost UK13 (about $23) each, off eBay: but even if they'd been new, they'd still have cost a lot less than a 100,000 gallon water tower.
They also weigh about 40kg each, instead of the 40-odd tons that your water tower is going to weigh when it's full.
I suspect your water tower weighs and costs about a thousand times as much as my batteries.[ Parent ]
100,000 gallons raised an average of 75 ft is:
100,000 * 8.3 lbs * 32 ft/s^2 * 75 ft = 1,992,000,000 lb*ft^2/s^2 = 23.3 kWh
That's equivalent to about 17 220 Ah, 6 volt batteries, which, new, are anywhere from $75-$100 each. Assuming you only discharge them halfway, that makes 35 batteries, which is like $2600, not including shipping.
Your point is still valid but, at the same time, for some people it may really be easier or more beneficial to build a storage tank on top of a hill than to purchase batteries.[ Parent ]
