Battery Wiring

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Re: Battery Wiring

Postby Privatteer » Wed Nov 04, 2015 9:28 pm

Gordon-Loomberah wrote:Those cables are all going to get rather warm, melty even...

Agreed. Probably just adequate from bar to charge controller but from bar to battery I would be looking at something in the 150mm2 range for 6000w.
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Re: Battery Wiring

Postby davidg » Wed Nov 04, 2015 11:06 pm

Privatteer wrote:I would be looking at something in the 150mm2 range for 6000w.

For a short distance (battery to inverter) say less than 5m, 70mm2 is OK or if you really want 95mm2.
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Re: Battery Wiring

Postby new to solar power » Thu Nov 05, 2015 7:28 am

I have an idea for someone on this forum. Many of you have a wealth of knowledge,experience and the required qualifications, to provide, for a small fee, a set of guidelines, as to the requirements to put together an efficient and inexpensive solar system.

There are lots people out there that just want guidance on how to get their project up and running like Harry 201.

Many of us have a dream of being off grid, but have relatively small budgets, and only a little understanding with regard to getting compatable parts.
If someone could put a package of requirements together using cheaper components that do the job fine from places like eBay etc, would be a big help. This could save wasted money from buying the wrong parts that just don't work properly and the bonus is getting a system that is safer to use. The safety factor is extremely important in DIY solar systems.
Just thought I would throw this idea in to see if it is worth talking about.
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Re: Battery Wiring

Postby harry201 » Thu Nov 05, 2015 7:50 am

Thanks Alex,
We totally agree with you, 1 of the experts ask how much I had to spend 25k. he said when I had 40k come back to him.
We would have more money to spend if we weren't sold wrong batteries from these so call experts.

The wire from battery to bus bar is 70mm2 double insul. The orange cable (16mm2) double insul. has been in use over 9 months and has NOT got hot or warm.
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Re: Battery Wiring

Postby Gordon-Loomberah » Thu Nov 05, 2015 9:28 am

You are talking about potentially putting 198A solar + say 60A wind charging current into the battery- 70mm^2 cable will get quite warm.

The 16mm^2 between regulators and batteries - it is probably enough for short distances if the current is evenly spread out over a number of regulators. How many regulators will you be using, and what are the specs on them?
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Re: Battery Wiring

Postby tom rickard » Thu Nov 05, 2015 12:24 pm

Experts are all well and good, but like you say, some of us have less than $25k to set up an off-grid system that will enable typical family electricity usage.

The good news is that it can be done, and if you search through this forum in various different areas you will find the complete details on the various components that can be used. It would be ideal to compile a thread with all the components required, but you will most likely end up with endless disagreements on the suitability of various components.
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Re: Battery Wiring

Postby Whitespeed » Fri Nov 06, 2015 9:07 am

new to solar power wrote:I have an idea for someone on this forum. Many of you have a wealth of knowledge,experience and the required qualifications, to provide, for a small fee, a set of guidelines, as to the requirements to put together an efficient and inexpensive solar system.

There are lots people out there that just want guidance on how to get their project up and running like Harry 201

If someone could put a package of requirements together using cheaper components that do the job fine from places like eBay etc, would be a big help. The safety factor is extremely important in DIY solar systems.
Alex


I think this is a great idea, however a lot of responsibility on decisions made has to be up to the DIYer, a set of requirements is one thing, however some basic electrical knowledge has to be gained from research first before guidelines are usefull.

Some are still using car battery's, alligator clips, speaker wire, car auto fuses and home wiring TPS "for the real heavy stuff" These are the ones that need some research before being given guidelines.

Most DIY people have a reasonable idea on what should be connected together. These people would realy benifit from a diagram with a cable sizing chart, fusing type and sizing formula and a guide on where they are necessary. A lot of DIY mistakes are not deliberate, they are a result of "not knowing what they don't know"

These forums are a wonderful resource, but you have to know the right question to ask to get the right answer and even then you may never get the question answered.

In the end It is nice, and the right thing to do, for professionals to actively discourage DIY DC electrical (There is never a place for AC DIY) however those that want to DIY will do it anyway.

In this case the pro's can either leave them to it, or offer some correctly indemnified advice to help keep them safe.
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Re: Battery Wiring

Postby jules » Fri Nov 06, 2015 10:26 am

It makes sense for offgrid people to have a good working knowledge of their systems partly to get the best out of them and equally because you'd punch yourself in the head if you had to call a sparky out from town an hour or more away, to fix something that just required a screw to be tightened up.

Many manufacturers, like Selectronic and Plasmatronics provide great manuals with their products, which provide more than enough information in the form of diagrams, schematics and charts. What can help a lot is to have clear photos of the nerve centre of systems showing how the wiring and layout of Solar regulators, fuses, shunts, inverters etc. Harry's photo was worth a thousand words and it would be very handy for other DIYers to be able to examine shots of an "ideal" set up to bring some of the dry schematics to life.

I think there could be a difficulty with this:

I have an idea for someone on this forum. Many of you have a wealth of knowledge,experience and the required qualifications, to provide, for a small fee, a set of guidelines, as to the requirements to put together an efficient and inexpensive solar system.


.... in that if someone took a fee for giving advice they might then have some responsibility if the system went horribly wrong.

One way or another I reckon this forum and particularly its qualified experts, sort out all manner of problems by the process of back and forth exchanges.

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Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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Re: Battery Wiring

Postby Cherokee Solar » Wed Nov 11, 2015 7:08 am

harry201 wrote:We live in country Vic, where we rely on our self's .


Hi Harry201,

Same here mate! ;)

You can can purchase larger diameter heavy duty copper cable (which you seriously need) from Cables Plus in North Melbourne. They sell large diameter twin core (black / red or either black / blue). Whilst you are at it, they also sell the lugs (which are the metal connector thingees) of various diameters for the cables.

If you need help with the cable sizing, can you tell us what sort of inverter you are connecting up to those batteries?

Cheers

Chris
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Re: Battery Wiring

Postby harry201 » Mon Dec 07, 2015 7:38 am

Hi all,
Thanks for the constructive advise, I have now changed battery/inverter wire to 95mm2(000).

Now moving onto my next delammer.
As stated earlier we are putting a 6kw system up(24 x 250w/24v/8.6a panels). So far we got 3kw up, now putting it through mppt controllers. One's we are using are only 60 amp, changing over to 3 x 100a mppt controllers to coupe with the 6kw system.
How can I put all 3 into the system without them fitting each other? Do I need to Put in a diode?

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