IMHO

Like this pump for example:

a Badu TOP S 8 pump, for example, rated at 0.4hp moves 9.1m3/hr and uses 0.3kW of power. This is 15% more flow using 20% less power than other major brand pumps rated at 0.5hp. So you can filter your pool quieter, faster and cheaper. That's good for the environment, good for your neighbours and good for your pocket.

https://www.dolphinpools.co.uk/equipment-and-accessories/pumps-and-filters/pumps

This was the plan:

Im in process of making a terrace/gazebo above my fishpond. On that roof i will install solar panels. I will add more panels if my budget permits. Like @gary i will slowly expand the system untill i have enough to run such a pump. But, when i read that indian story and how much he inevsted its not so huge. So, the planned pool will def come.

Rule of thumb: whatever the spec is on a pump, reality is half once it's used for a pool with filter, pipes, bends, valves etc.

Let's say that pump can move 4,500L/hr once it's all setup. With 4-5 hours harvest time, in which you need to make 2 full turnovers of the pool, it can support:

4,500 *4.5 = 20,250 / 2 = 10,125L pool size (+/- 10%)

So you'll need several of them for your example pool. I can't see how that saves money over just buying one pump with the required flow rate.

@naam,

For me is a small pool 24-36m2, begin from 20cm up to 1.20 (1.50)m deep. Challenge for me would be a solar powered pump that do the job only during peakhours.

Although you sound a bit arrogant @naam, ive learned form you. Danke. Ofcourse thanks also to jingjoe, muhendis, crossy, gary and all others in this thread.

In that case you will need 0.75HP to 1.5HP of pump.

Don't forget that the reason you pump water in a pool is so you can filter it, and filters are not particularly low resistance.

No load voltage measurements for a 12V nominal lead acid are"

100% : 12.7V

90% : 12.5V

80% : 12.42V

70% : 12.32V

60% : 12.2V

50% : 12.06V

40% : 11.9V

30% : 11.75V

20% : 11.58V

10% : 11/31V

In order to calculate the DOD with a load present, you would need to understand the load itself, the internal resistance of the battery, and the resistance of all connectors and cables. Apply some Ohms law and you'd then be able to work it out.

Since the batteries are used every day and usually discharged near 50 percent

how do you calculate the discharge percentage Gary?

is there a given fixed rule like "voltage x = discharge %" or is it calculated / estimated because you know your demand?

The state of charge of lead acid can be determined pretty accurately by it's no-load voltage. Under load it becomes a lot more tricky though.

About lithium vs lead acid. This is a way to do a (price) comparison.

I agree with Gary A - any proper comparison needs to take into account actual DOD's you'd use for each battery cell type.

Here's another one just taking advantage of the difference in photocatalysis of black and white surfaces:

Here's one for @George

Maybe you could scale this up for your pool

For those interested in LifePo cells, make sure you do your research, as you're going to have to give them a nice temperature controlled environment in order to achieve manufacturer claims.

Talking about pumps @naam,

Plan also to make a swimming pool. Just saw this on internet which i like very much.

Im wondering what kind of pump i need to operate such a relatively small pool solar powered.

The target you want to achieve in an outdoor pool is turning over the complete water volume twice per day.

Let's say that pool is 4M wide, 10M long and an average of 1.5M deep - the means there's 60,000L you need to circulate twice per day - so 120,000L in total. Seeing as you want to run the pump on solar energy only, where you have really only 4-5 useful harvesting hours/day, that means you need a pump and filtration system that can move 24,000 - 30,000 litres per hour / 400 - 500 litres per minute.

Seeing as you only really get about half the flow rate that's advertised on the pump, once plumbing, fittings and filter restrictions are factored in I would think 3-4 HP is what you'd need.

ktw.co.th

hardwaremart.net

bhhtrading.co.th

What do you think of this non solar advice??

Non solar advice:

The power outage in my city is lately horrible. Few x per day and yesterday also as from 11 evening till " i dont know" cause i slept at 2 and it was still dark outside.

This morning a friend called and asked for the cheapest way to use a pump like mine with solar in case of power outage. He returned yesterday from a party with his wife and child(student) and they were not able to flush the toilet and not able to shower. They have a 220v (well)pump directly connected to their cranes.

They shower the asian way, also flushing their toilet. Up till now they have i think a 50-60 liter bucket in their bathroom. Each time after shower they fill it again.

Only for emergency i said to him that he can start his motorbyke or car and connect a dc 12v pump like mine the battery

connect a permanent cigarette plug/socket under the seat of your motorbyke to the battery (fuse it) and make the connection to the dc pump. Also you can connect some 12v lamps with it. Your motorbyke is your genset. But it cost you a bit fuel.

I also advised him to think about a watertank placed above the highest crane big enough for e.g. 2 days water supply.

The solution to this one is cheap and very simple: a bigger bucket.

The process is 100 percent clean as its only byproducts are oxygen gas and water, the company said.

a bit sad to read that from an "EcoWatch" journalist because oxygen is not a byproduct but the other active fuel ingredient which produces energy when combined with hydrogen.

the byproduct is H²O (water) in Thailand called "naam".

.... which quite ironically, you don't drink

There is no automatic warning to tell you to change the filters however the vertical filter hidden behind the pressure tank has a glass cover through which you can see how muddy the element looks and judge for yourself when to change them.

That will be the first filter in the set - usually ceramic. When it gets fouled, you clean it, not replace

After about 4 cleans, it's time to replace..

I know that the real ah is not 80000. Ive seen reviews on boring youtube. No more than 30.000mah.

Keep going down... no way it's 30Ah. No way.

Ladies & gentlemen & @naam

Hehehe joking @naam.

I needed a new handphone powerbank and thought why using only for underway??

Just for fun i ordered online and

Today received:

80.000 mAh powerbank

Usb to usb connector with 4sockets and switches

Tv receiver to connect to any monitor or laptop

Usb led lamp with cable 5 watt

Usb table reading lamp with 27 leds

Mpg player

Usb fan and tablet i already had.

So my future desk will be usb powered, thats 4.5-5+volt except for my laptop.

When im using my laptop in the evening i want also follow the news on tv. For a better quality screen i perhaps later will buy a car monitor

This powerbank i ofcourse charge with solar panel.

What you want more? Low power consumption gadgets incl tv for at your desk. And if im underway i carry my 80000mAh samsung UPS with me....or is it a powerbank...hehehehePS_20160317124041.jpg

Let me guarantee you right now, there's no way that thing in the picture is a 296Wh battery bank (3.7v x 80,000mAh).

"Reverse Osmosis" is nothing more than a posh name for a filter and UV system which will clean and/or kill all unwanted substances in your water.

You mean it's got nothing to do with reverse pressurising an osmotic membrane?

Unless there is a bit of poetic license floating about I would say No. There are three filter elements in mine and they all have different grades of filtering material two of them rattle and the third is some sort of compressed paper element through which passes the water. Let us know if I'm missing something.

The regular 3-stage drinking water filters you see around Thailand are not reverse osmosis systems - the standard recipe is a sediment cartridge (usually ceramic), then into a carbon cartridge, then into a resin cartridge. Beyond 3 stages, they normally add a post carbon filter (or two) and/or a UV irradiation lamp.

There are actual RO filters available, but as Naam notes, you need a stage after them to add back in essential minerals.

It all depends on how good, or bad, your supply water is. If it's colorless and odorless, a 5-stage filter (with one post carbon + UV irradiation) produces pretty good drinking water. If your supply is particularly nasty, it's best to consult with an expert though.

I am not a fan of RO systems.

A while back a car AC system was discussed for a home. I believe it was Naam who mentioned it. I am very interested to try to set this up but i have one question, regarding the 12v motor which would drive the compressor by belt.

Wouldn't a 12v motor be too weak for this? I imagine a big start current which would require thick wire in the motor. Or was the motor maybe 24v or 48v? Can anyone give some advice here what kind of dc motor to use?

Forget volts - talk in HP or watts.

My kid has a radio controlled car with a DC brushless motor that makes 8HP from an 11.1V LiPo battery, for example

According to this guy he runs his pool pump during the day with his 4 x pv panels.

What i dont understand is why he needs some inverters????

https://m.youtube.com/watch?v=REJSPQDJibc

Because he's running a 110V AC pump

I'd like to see a demo of startup - running is easy

The biggest problems with PV powered pool pumps are:

1. How to start the pump

2. How to pump enough water while the sun shines for normal usage

3. How to pump when you have a night time pool party

4. How to pump it 24/7 when overcoming sanitation problems

you overlooked Joe's "multiplied by say 10" because he plans an array of small pumps.

He can do the math I'm sure - I've even given him some pool dimensions to multiply

Some filter design considerations needed with all your clever minds.

easiest solution would be washable filter bags

Do filters operate under pressure Naam? if not; could all the pumps feed into one manifold then into just one washable gravity-fed filter bag you suggest?

Individual pump outputs should be able to be visibly monitored, given appropriate manifold design.

I have no idea of volumes of water turnover but is 67 litres/ minute multiplied by say 10 feasibly enough for what size pool?

Naam some answers have come thanks by my looking carefully at your recent posts and has given me fresh hope that we will have a solar powered smaller pool after all. (with these modern pumps available that is).

67L/min = 4,020L/hr

If this was an outdoor pool (2 turnovers/day), powered by PV only (4 reliable harvesting hours/day) the pool could only be up to 8,000L small. e.g. even if just only 1M deep, it could be no bigger than 2M x 4M

In short, there's just no way you're doing even a modest sized pool without big wattage pumps.

How does 22litres per minute at 55w max sound?

sounds very efficient!

A typical 550W AC induction pump (0.75HP) does around 230L/min label rating - actual in service is more around 100-120L/min.

So, 22L/min @ 55W sounds about right.

But at an actual ~10L/min once it has plumbing and filter on it, and powered with just 4 hours of PV it's only circulating a 2,400L pool water tank ... 1,200L if you want to turn over the water twice every 24 hours (as is highly recommended for an outdoor pool).

i.e. not suitable for an actual pool. Not even one of those inflatable kids pools.

Some filter design considerations needed with all your clever minds.

easiest solution would be washable filter bags

Do filters operate under pressure Naam? if not; could all the pumps feed into one manifold then into just one washable gravity-fed filter bag you suggest?

Individual pump outputs should be able to be visibly monitored, given appropriate manifold design.

I have no idea of volumes of water turnover but is 67 litres/ minute multiplied by say 10 feasibly enough for what size pool?

Naam some answers have come thanks by my looking carefully at your recent posts and has given me fresh hope that we will have a solar powered smaller pool after all. (with these modern pumps available that is).

Are we talking about pool filters still?

As sand filters get bigger, they actually get harder to push water through - as cartridges get bigger, they are easier to push water through. I have both types - when fully cleaned the sand filter has a static pressure of 5 PSI, the cartridge filter <1 PSI.

i do not detest solar power but i am a poor man who can't even afford a photovoltaic system that can supply power or starting amps to 10% of the electric gadgets in my home and garden.

You made me curieus @naam. What kind of electric gadgets? Is it possible to posts some picts.

For a swimmig pool is this a solution:

That is a DC pump with speed controller - which is one way I mentioned it could be possible earlier in this thread

The question is: does it have enough flow rate for your pool? Based on what I can see that pump is probably 0.5HP - as an educated guess, I'd say enough for maybe 10,000L pool (that's a very, very small pool) if running just 4 hours/day on PV.

Generally speaking for a relatively idle, domestic pool you want to turn over the whole pool volume at least once per day (ideally, twice). If you have 4 hours (+/-) of usable sunshine, that's a about double flow rate than what's normally specified, as most standard mains powered systems are designed for ~8 hours runtime.

At times when your pool sees high swimmer loads you'll want an even higher turnover rate to keep the water clean. My pool has an additional pump and filter I turn on at these times that then gives me a ~3 hour combined total turnover rate - and from time to time, I absolutely need that kind of flow rate to keep the water clean.

Note: Whatever flow rate your pump advertises, halve it to get reality - once pipes, and an already partially contaminated filter are factored in, that's about all you can rely on it doing.

Back to solar. There is a company in holland who make this kind of solar rooftiles and they are bussy. Here in indonesia is also such a factory but the quality is still not so good. If its the same quality as in NL i will sure order these and replace (part of) my roof. Very good idea.

There a few companies now marketing solar roadways too

http://www.solarroadways.com/Product/Features

19 aircons and 7 water pumps.

Aircons i can imagine if you have many rooms. But, 7 waterpumps??????

Do you have a guesthouse??

I shall look up a quotation from a solar company for a house of a fam member of mine in jakarta who has 9 bedrooms and 12 aircons. If ill find it i will post it here.

I have 7 water pumps also:

1 Main house

1 Guest house

1 Auxiliary (for tank-tank filtration)

1 Ground pump

3 Pool pumps

I only have 9 aircons though