[spark1]

sealed lead acid batteries ie leisure batteries , i,ve managed to revitalise a couple of mine by removing the top cover and refilling with distilled water , if the water is not covering the plates they won,t work correctly , worth a try guys regards alan

Why not use deionized water 

Same thing, just a different way of producing it. I'm sure that on the parts per billion scale you can measure the difference, but ppm it should be the same.

Just thought it would be easier to tack it from a huge tank in the back of a van :

[scud]

  I use a battery from an HGV, I only charge it once a fortnight and never had it go flat on me, been going strong over a year now - and it was a second hand one from the scrappy.

  Only down side is they are a bit big and VERY heavy, but mine goes under the passenger seat of the van.

[Moderator David@stives]

Squeeky

That isnt true , why dont you just try it , i swear you will never go back, works for me on 3 vans, some days we dont go as far as 500yds, even park up for 4 hours at a time with 2 pumps running constantly.

TRY IT  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Dave

To clarify this Dave, your using the Van battery for starting and powering your wfp system? Do you have any wiring diagrams?

Yes thats right , you dont need a digram , just wire positive to positive and neg to neg

[NWH]

Transporters would be good for doing this as they have heavy duty batterys,you might have trouble doing this on sn old dog of a van though with a dodgy alternator etc,on a newish van i couldn`t see any problems unless your unlucky and have a faulty battery.

[ftp]

Concept 2o run everything from the van battery but reckon on changing it after eighteen months i was told.

[Rogue Trader]

I have had this setup since my system was installed last december and all was well till it went flat yesterday. I was only 5 mins walk away from home so didnt matter. Went and bought a new one ..... however this battery was a few years old anyway before it had a pump wired into it , i will definately continue using this method because as long as you have a spare battery in van it is by far the simplest with no split relay installation or nightly charging routine.