12 to 24.

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Re: 12 to 24.

Postby 7stringgun » Thu Oct 09, 2014 6:23 pm

Gordon-Loomberah wrote:I've been running 2 MPPT regulators with different panels for quite some time, no one told me it was a no-no!

Have a read of the Virtual Tracker thread regarding positioning of arrays etc:
solar-wind-gear/topic5064.html


I thought unless you had two identical mppt regs that talked to each other it was futile.

Love what I understood but truthfully a lot got lost in the grey matter, I will keep reading until I have an understanding or some relevant questions. Thanks

davidg wrote:
7stringgun wrote:We are four hundred clicks round trip from a tradesman

400 from where? ........ :? I've done 1900k's for some jobs each way. 8-)


In between Cunnamulla and St George, not much out this way unless you have a sheep fetish, if you can come up then I can hook ewe up.
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Re: 12 to 24.

Postby Whitespeed » Fri Oct 10, 2014 9:40 am

Hi there 7stringgun welcom to the EM forum,

You will get to know the personalities on the forum after a while. Most people on here are very helpfull and will offer advice on pretty much whatever you want to know about.

7stringgun wrote:I know you guys hear day in day out all the woes of peoples solar problems that are usually self inflicted and would be apprehensive about providing advice (especially since you are a sparkie David and giving free advice doesn't pay the bills)[5]


David is a sparky, and a very helpfull one at that. Your statement in brackets is not the reason that he will not be that willing to give advice on matters that require an electrician. He has a duty of care as a proffesional in a public domain to not provide an unqualified person with knowledge that if not applied with proper understanding could cause personal injury or death.

If he gave you instruction on how to wire your home and it is proven in court that it lead to you or another person being killed. The courts at very least would take his career from him, along with a huge chunk of money. If a bereaved family where involved, they would charge him as though he personally jammed your fingers into the live socket.

7stringgun wrote:but surely there is also an argument that sometimes the best way forward is to give the soundest advice to get the job done"[5]


This is exactly what he is offering :)

In the end as David has said "It's law, regulations require it, if you choose otherwise it's your choice" All here will offer all the advice they can, but try not to judge too harshly if they offer advice that may save you or your home :)

Edit: 400km round trip isn't that far for a pro, I drive 150km 5 times a week for work. Ask a sparky to take a look sometimes it isn't a shock :)
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Re: 12 to 24.

Postby davidg » Fri Oct 10, 2014 9:58 am

7stringgun wrote:In between Cunnamulla and St George

That unfortunately is in QLD, being in Vic ................ :(
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Sparkys light up your life :)
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Re: 12 to 24.

Postby Gordon-Loomberah » Fri Oct 10, 2014 10:09 am

Re earthing the small Latronics inverters, here is the response from Latronics (about what you should get a sparky to do):

>>
Hi Gordon,
All inverters 500W to 1800W only have a 3pin GPO. To earth it I suggested using a star washer (or similar to remove the paint) on one of the mounting holes as the whole case is earthed to the earth pin of the GPO.

Kind Regards,

William Pettit - MIEAust. CPEng.
Chief Engineer
==================================
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Re: 12 to 24.

Postby 7stringgun » Fri Oct 10, 2014 10:28 am

Hi guys and thanks.

Whitespeed, I am not an idiot and understand liability concerns. There was no need for you to be Davids lap dog and point out the obvious. No disrespect but I am certain (apart from already knowing the liabilty side of things) that David is capable of saying something for himself. I am not out to kill myself or burn my shed down, I think I am smart enough for that despite not having letters after my name.

David, I am shocked the offer of a ewe and beers (even a pair of beer goggles) doesn't tempt you, shame I am not in nz!

Gordon, bang on and appreciated. Things don't need to be so complicated and there is usually a simple solution to most problems.

However, I think I am going to stick with the existing 12v set up and see if I can just add panels. So is the 120vdc relate to the whole system or is that each array?
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Re: 12 to 24.

Postby Gordon-Loomberah » Fri Oct 10, 2014 10:43 am

120V DC is the maximum panel string voltage. 2 X 72 cell panels in series (~90Voc) is fine, 3 needs a sparky. 90VDC will still hurt a lot and is dangerous, epsecially if you have wet hands!
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Re: 12 to 24.

Postby 7stringgun » Fri Oct 10, 2014 10:54 am

Thanks Gordon.
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Re: 12 to 24.

Postby 7stringgun » Sat Oct 11, 2014 9:09 pm

I have ordered a refractometer and a couple of megapulses (thanks David for the phone call).

I also scored some cool room panels today to build a room for the batteries, they say we are in for a stinker of a summer so it can't hurt.

The guy I got the panels from had two fisher and paykel smart drives lying around so threw them on the trailer as well, thinking I might try to build a micro hydro set up to put on the dam. Anyone got a place to look for jets and a pelton wheel?


Gordon G? One of my childhood friends Boony is an aerospace engineer and has mentioned you a few times if I have the right person?
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Re: 12 to 24.

Postby Gordon-Loomberah » Sat Oct 11, 2014 9:25 pm

Rainbow Power Company have a pack of jets which are of decent quality, I've got some for my (still not quite completed) pumped stored hydro-electric system.

What sort of head and potential flow do you have with the dam?

Yes the G is correct, whether or not I'm the right person, who can say? :lol: Perhaps a look at my web page will make it clear :idea:
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