second-hand batteries in stand-alone system

[StanFitz]

Hi everyone,
I've been browsing the forum a while before posting this query. There's a lot of technical jargon between you guys so I hope you can tone it down a bit if you reply to my query.
I live in Cyprus and have bought some PV equipment from Italy and have an electrical guy putting it together for me. My system will be a stand-alone system because I am miles from the grid. He is not keen to do what I am about to ask but I need other opinions before dismissing the idea.
My kit consists of 15 X 175w panels, 10 x 12v (5x24v) batteries, charge controllers and an inverter.I have been offered another ten USED batteries to use with my system. My guy does'nt like the idea of using new and old batteries. My inverter has two inlets for DC current, maybe one for panels and batteries and another for a wind turbine. How would it be if the used batteries were a completely different battery bank (although charged with the same solar panels) and fed into the second DC inlet ?
The new batteries have two terminals each, pretty straight forward, but the used batteries have eight terminals - 4 poss. 4 neg. The Spec label on the used battery tells me :- CL1000(2v1000ah), Valve regulated rechargeable battery, Constant voltage charge, cycle use 2.40v-2.45v, standby use 2.25v-2.30v, Initial current less then 200A, Center Power Tech Co.Ltd. Can anyone tell me what I have and are they any good to me ?
Thanks in anticipation, Stan Fitz.

 

[Worcester]

@StanFitz

Inverters usually have very specific charateristics depeding upon wether they are converting wind, sun (PV) or batteries, the two inputs are usually expected to be from the same type of power source. I may be wrong, however I am not sure you could mix it that way - SMA for example do a 'Sunny Boy' and Windy Boy' and a Sunny Island for the different power sources that you've mentioned, from what I remember the Sunny Island acts as a charge controller and inverter for the batteries depending upon the availability of powere frome other sources (wind and sun) at any particular moment in time.

 

[MarkieSparkie]

Hi Stanfitz, it sounds like your 'old batteries' are actually individual 2V cells. You would need 6 of these connected in series to make a 12V battery, however as you only have 4 of these (an 8v battery) they are not a lot of use to you at present. If you could obtain 2 more of a similar capacity (1000Ah) you would be able to make a very useful 12V battery. Assuming the actual capacity and internal resistance of these individual cells where measured and found to be within the manufacturer specification, then I see no reason why the two battery banks could not be used together, but it might require some electronic switching to control and protect each bank.

 

[StanFitz]

GOSH!!! you guys browse late into the night! thankyou Worcester and Markie Sparkie for the immediate interest
If the inverter is a big issue here, I can tell you that it is a Victron Multiplus 24v 5000w which I am hoping to connect an old 4 kw deisel generator to.
StanFitz.