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Forum Index : Solar : 6v trojan t105
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| trout Newbie  Joined: 29/11/2014 Location: AustraliaPosts: 24 |
Hi there pete im goin to go 6 volt mate trojan t105 flooded 225ah can get them fof around $220 each .im thinking of getting 8 in totall, at the moment I have one 12v battery so how do i conect 8 batteries up to my pl60 contoller Cheers |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
225AH for around $220 is the going price these days. You could probably get them a bit cheaper for a quantity of 8. My battery bank consists of 8 230AH batteries and I paid $1600 for them about 3 years ago. They weren't Trojan, but a reasonable quality golf cart deep cycle battery. Are you running a 12v system? If so, you would connect 8 in a series parallel configuration. 2 batteries paired off in series will give you 12v, and 4 pairs are wired in parallel. If you dont know how to connect the positive and negative terminals to get a series parallel 12v battery bank using 8 6v batteries, then you shouldn't be dabbling with this sort of thing sorry. Wiring up and maintaining a battery bank requires a certain level of knowledge, if you get it wrong it will cost you money in damaged batteries and possible injury. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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Downwind Guru  Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Like this if using 8 X 6V cells. 
Pete. Sometimes it just works |
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| davef Guru Joined: 14/05/2006 Location: New ZealandPosts: 499 |
Three other considerations: - if you need 12V at 880ah (4 * 220ah) then you should be considering going to 24 or even 48Volts - you should consider NOT paralleling battery strings - make sure you properly fuse this setup, you are talking about a lot of energy To balance the discharge and charging currents in parallel strings properly gets complicated. |
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powerednut Senior Member  Joined: 09/12/2009 Location: AustraliaPosts: 221 |
I've always been puzzled by the advice to not parallel battery strings. It doesn't make any sense to me. Can you elaborate Dave? |
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| gww1 Regular Member  Joined: 14/06/2013 Location: United StatesPosts: 63 |
Because it is hard to get the batteries to charge and discharge equally unless you wiring is exact making the resistance exact to all points. You end up undercharging some batteries or over charging others. http://www.smartgauge.co.uk/batt_con.html Sorry I still didn't figure out the posting of a link. It was explained to me but now I have to go back and read it. gww |
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| gww1 Regular Member Joined: 14/06/2013 Location: United StatesPosts: 63 |
wiring diagram |
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| powerednut Senior Member Joined: 09/12/2009 Location: AustraliaPosts: 221 |
hmm.. yeah, okay. I'm pretty sure you'll get more variance between the batteries internal resistance than the difference in wiring would make, but I note all of those batteries are wired in parallel. Surely pay attention to decent wiring would be better advice than don't wire in parallel? |
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| trout Newbie Joined: 29/11/2014 Location: AustraliaPosts: 24 |
Cheers guys I have a sparky mate comin to sort it out |
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| trout Newbie Joined: 29/11/2014 Location: AustraliaPosts: 24 |
Nice pic pete thanks for ya help |
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| davef Guru Joined: 14/05/2006 Location: New ZealandPosts: 499 |
Thanks gww1, that was the site I was thinking of and could not find the link to. I said to consider not doing it. Trying to wire up 4 parallel strings ... well that would require some serious thought. Good luck |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Dave, Your point taken, but is it a big issue with flooded cells i think not. Gell cells may be? but flooded cells are more forgiving, so what, if you boil off a little water from some cells in overcharging to bring others up to equal charge, it just means closer battery maintenance required to top the levels up. We dont all have the budget to live in a ideal world, so we make substitutes to best suit our budget. As pointed out previous the quality of connecting cables are a great importance. Pete Sometimes it just works |
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| gww1 Regular Member Joined: 14/06/2013 Location: United StatesPosts: 63 |
Pete I agree with you post whole heartedly. It does give one cause to look at the othe alternative though. I ended up with a forktruck battery. I am not sure if the end cost is camparible to lots of golfcart batteries but might be worth looking at. I do know that I am glad that I only have 24 cells to check for sg. That means quite a bit now that I have done it for a while. I also know that I won't be moving my battery due to weight. I am a cheep skate but am also dumb as I have only been doing this for a couple years and mostly know what I think I know from reading. It might be worth looking around and comparing the price point. I do know when I was looking not that long ago that I tried to put battery life in the comparicence and also the cost of all the cableing. If I had a bunch of 2/0 wire and ends just laying around and didn't have to buy it all, I may have went a differrent route. I don't say do what I did, just that it might be worth adding the concerns of parelel bank and what they entail into the equation and doing a bit of research. It may end up being a waste of time, but you might find something that works for you better. In the end what works for you is what is important. When My battery goes bad I will post back whether what I did worked for me. the jury is still out. Good luck gww |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Gww1 A good point you make there on the cables as i just looked up the the cost of reasonable quality 250 amp connectors and the wholesale prices are between $32 and $35 each, now you can make them yourself a bit cheaper if not counting time. On my battery set there is over 100 cables and if I had to make them myself, I would go crazy. Next bank for me will be either 4 x 6 Volt 1500 AH batteries or a NIFE cell pack @ 24 volts 1500 AH depending on how much I can save in the mean time. I have found out that Cheeeep is the most expensive way to do things. All the best Bob Foolin Around |
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| gww1 Regular Member Joined: 14/06/2013 Location: United StatesPosts: 63 |
Bob I did make everything I had to make but even making them was not cheap. Not having to inter connect the batteries was a godsend, Though moving the battery to where it is probly if filmed, could have been used on funniest home vidios. An eight foot trailer, a honda fourwheeler and a kabota tracktor that was way under powered. They weigh a ton and are the smallest 48 volt amp hour batteries that were sold were I bought. I have got some good deals, about 200' 50 amp service wire my uncle got at a garage sale for 15 buck. I wouldn't use alum on batteries but it is fine for running pv. The problim with good deals is they aren't always there when you need them and if you wait on them you never get done. I would take stock on what I had laying around while making decisions though. I will also say it is really nice to only keep track of 24 cells when checking sg. I only spot check a couple cells reagular but there are times when you need to do them all. I can't imagine checking 94 cells and writing down the results. Again I am not being critical cause that was what I intended to do and don't really know why I did this instead. Everybody kept saying forktruck batteries would last 15 years and I thought I would see and these other things just turned out to be a bonus that I hadn't even thought of. gww |
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| gww1 Regular Member Joined: 14/06/2013 Location: United StatesPosts: 63 |
Also, I am not pushing these batteries and only list them for a price point of referance. I am sure there are simular ones where you are. Also they say forktruck has a bigger self discharge and sometimes take longer absorbs and have a bigger volt drop under load. Here goes fork truck batt They seem simularly priced but are much heavier to move. I paid no core charge and those prices were delivered usa. gww PS take this post with a grain of salt, remember, most people defend decisions they have already made cause no one wants to be considered dumb. I don't mind if I am considered dumb if I can learn from it. I also have no other experiance to draw from but these cause this is my first battery and solar and wind. |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Gww1 Prices are much the same here on the fork batteries so that will be the second option if I cannot get a good result with the ones I have now. I have finished cabling now and once I catch up on the mowing I will set up the new inverter and start load testing, the grass is taking first place at the moment because if it gets to big it is a real hassle. I also haven't had a chance to move bank 3 yet so that is another contract for a couple of days. All the best Bob Foolin Around |
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| gww1 Regular Member Joined: 14/06/2013 Location: United StatesPosts: 63 |
Bob I hope you have good luck for a while with your batts. gww |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
My "go to" battery for the last few years has been the BAE Secura Zella series. there was some really good deals around last year for the 660. I suspect that has finished since the drop in the A$. Not really suitable for short term or casual power use, they need to be worked to get good value out of them. I'm confused, no wait... maybe I'm not... |
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