I have been in contact with Simon on a number of occasion and he...

I have been in contact with Simon on a number of occasion and he is good a replying have patience
and he will get back to you . best of luck in trying to buy battery's from Redflow I have been trying for 5 years finally gave up and installed gel . Would have like to have installed the salt water battery's but at the time they looked as though they were going bust.(They have been brought out and are now good)
Try this site http://batterytestcentre.com.au it a good site to get all of the option together. The Redflow Z cell doesn't look good but I believe  its more of a problem with the way it is being tested rather than the Z cell itself , that actually applies to a number of the battery's on test .You can see to ones that are having no problem at all. One of the problems you are going to have is Redflow has only one success story published that's Bosco in South Africa. There is one other that I know off but the success has not been published. So in my case I had one success and one total failure to compare. And the fail was in my backyard and in the configuration I wanted to use. Redflow didn't assist the installer (he pulled out )and that left me without my main man . The salt water battery is a dumb battery and require nothing more that a volt meter to monitor although you can still do all of the fancy thing with your Inverter. Just a tip take Simons advise on inverters he knows them inside out.