[LHill]

Hi All


http://www.machinemart.co.uk/shop/product/details/051012600

I intend to power it from a 12v leisure battery with an inverter, so I can produce water on-site without an electricity source.

[Lee GLS]

The pump would work with the hf5, but not through an inverter with a battery,

[Spruce]

Do you actually need the booster pump in the first place?

Firstly you need a bigger inverter as the booster pump draws 600w and you need a bit of lea way. I found this on the web which will help you decide whether you can get this too work or not.

Note: Figures in brackets are for 24V systems.

 

Q.

How much current is drawn from the 12V (or 24V) battery when running an inverter?

 

A.

The simple answer is- divide the load watts by 10 (20). E.g. For a load of 300 Watts,

the current drawn from the battery would be:

300 ÷ 10 = 30 Amps (300 ÷ 20 = 15 Amps)

 

NOTES:

• It is the actual load watts, not the inverter rating that counts. So a 1500W

inverter with a 500 Watt load would be 50 (25) Amps, not 150 (75) Amps.

The same inverter with a 1200 Watt load would draw 120 (60) Amps.

 

• For a quick idea of how long a battery will last without the alternator running,

think of the load watts in terms of headlight watts-

How long will my battery last with an inverter load of 1000 Watts?- About

as long as having 10 x 100W driving lights on.- You know a normal car

battery wont last long even with just 2 x 55W headlights and 4 x 5W

park/tail lights- 130W total.

 

• For a more accurate calculation of battery current: Divide load watts by actual

battery voltage, this will be in the range 12-14V (24-28V). Then to allow for

inverter efficiency, typically 85%, divide the figure by 0.85. Thus:

For a 300W load at 12V….300 ÷ 12 ÷ 0.85 = 29.4 Amps.

For a 300W load at 14V….300 ÷ 14 ÷ 0.85 = 25.2 Amps.

You can see the simple divide by 10 gives an easy “worst case” guide.

(Similarly:

For a 300W load at 24V….300 ÷ 24 ÷ 0.85 = 14.7 Amps.

For a 300W load at 28V….300 ÷ 28 ÷ 0.85 = 12.6 Amps.

You can see the simple divide by 20 gives an easy “worst case” guide.)


Now looking at this I would say you won't be able to do this.  An 85amph leisure battery would be flat in just over an hour but that's not considering what the discharge heat would do.

Spruce

[Spruce]

The pump would work with the hf5, but not through an inverter with a battery,

Hi Lee
You got there before me. So basically no is the answer. Better a 230v petrol generator, but this begs the answer to 2 further questions.
How would he shut the generator off when the tank is full, and secondly, what sort of unneccessary attention will an unattended running generator bring among some low life who happened to be snooping about the area?

So my original question - does he need a booster pump or can he make do with a less efficient R/O?

Spruce

[LHill]

I was hoping to do something like this

http://www.youtube.com/watch?v=OulhNYUk0Ec&feature=channel_video_title

I really need to be able to fill 250L tank in 30mins or less.

Do you think this would be possible with about 40-50psi tap? and hf5 4040 without a pump?

[Lee GLS]

I was hoping to do something like this

http://www.youtube.com/watch?v=OulhNYUk0Ec&feature=channel_video_title

I really need to be able to fill 250L tank in 30mins or less.

Do you think this would be possible with about 40-50psi tap? and hf5 4040 without a pump?

No, my 4040 with 80psi tap pressure used to make 125 an hour unpumpped.

[Mist A Bit]

I was hoping to do something like this

http://www.youtube.com/watch?v=OulhNYUk0Ec&feature=channel_video_title

I really need to be able to fill 250L tank in 30mins or less.

Do you think this would be possible with about 40-50psi tap? and hf5 4040 without a pump?

if you get a static sysytem in your garden and make the water at home you could then just transfer to van in 5 mins

[LHill]

Thats what i've been doing, but problem is I live in a tower block and have a 250L tank in my kitchen and have been hanging a hose out of a 3rd floor flat to my van. It's not exactly ideal but I have got to make a living. Problem is now I've got quite a bit of work I'm doing it almost every night and the other residents are wondering what I'm doing.. I don't like to draw attention to myself (not around here anyway).

So I've spoke to a couple of friends who will let me use their outside tap, problem is I dont want to be sitting around for two hours while it fills.

I do have a few big jobs where I use 2000-2500L and can use their taps. So the new system I bought will come in handy for those.

I'm wondering now if I buy a 2nd hf5 4040 I can fill it in 30-60mins?

[Mist A Bit]

it will never fill that quick, best bet is find a friend who might let you have a 1000ltr ibc tank in their garden. i have a 1000ltr tank at my mums and another at my house. if you could by or set up something like the ionics quatro which they say is pure water on demand( providing thier is a mains tap where your working). personly i just have a small ro that is constantly running at home