New offgrid system

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Re: New offgrid system

Postby offgridQLD » Thu Apr 19, 2018 5:16 pm

What I would question is. if I had a Casio solar powered calculator sitting on the bench in the shed do I have a secondary remote power station?
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Re: New offgrid system

Postby Gordon-Loomberah » Thu Apr 19, 2018 5:46 pm

Depends on whether the sun is shining on it, or just room lights :lol:
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Re: New offgrid system

Postby offgridQLD » Thu Apr 19, 2018 6:10 pm

I really think you would have to be trying very hard to game the retailer to your advantage before any attempt at trying to inforce a contract breach. (as in mixing in your stand alone system with your grid tie to game more feed in credits)

grid tied Pv on your roof suppling your house loads over the day and feeding back to the grid limited at 5kw. nothing to talk about.

Separate shed or dwelling with a stand alone remote power system (with no connection to the house or any interaction at all with the grid. Simply supplying loads in the building as a island system Is none of there business and couldn't be justified how that could effect a contract that relates to a separate system.
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Re: New offgrid system

Postby offgridQLD » Mon Sep 10, 2018 9:50 am

Some delays in the building progress has given me more time to go over all my options and find some new ones.

Some of the costings to go on the grid are potentially more than expected due to underground trenching and easements through relatives land and so on. Along with just having to deal with multiple 3rd party's along that all have delays and costs.

Or what's that old saying.....If you wand something done the way you want it you should do it yourself. :D

I need to get cracking now on putting a system together.

About to pull the pin on 16x400ah winston lifepo4 cells. Will be running the batrium BMS with them.

Looking for a fair price on a new Selectronics SPpro 482 7.5kw inverter. Big investment but thinking buy once cry once usually pays off in the end.

Gordon is this ( Selectronics SPpro 482 7.5kw inverter) something Energy Matters can give me a price on? Price seems to varry considerably online from one place to another and would be nice to purchase something that expensive from some one trustworthy.

Idea was to use one Midnite solar charge controller to handle the DC side of PV charging as I am very familiar with them. Around 4000w of pv that will get things up and running to commission the system.

Perhaps combining a Fronius inverter AC coupled with 5 - 6kw of pv. The idea is I can have the AC coupled side of things installed by some one acredited to get the RECs on that side of things. Could work out better value or simular to going all DC.

On a side note to get things going. As in to provide some AC power to the builders for the shed and house. I have pulled out my old PIP4048 all in one 4kw inverter and 80AH of calb lithium at 48v. I have around 2kw of 2nd hand pv that's feeding it. This little temporary off grid system should be enough to get them out of trouble charging cordless tools and running power tools. (same inverter ran my workshop in QLD for a few years)


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Re: New offgrid system

Postby Gordon-Loomberah » Mon Sep 10, 2018 11:19 am

Hi Kurt, you might have to shop around a bit more, as I'm pretty sure EM don't sell Selectronic gear.
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Re: New offgrid system

Postby australsolarier » Tue Sep 11, 2018 4:30 pm

Kurt,
after you buy the selectronics additionally you need an Ethernet dongle to remotely watch what the selectronic is doing. hooking up a generator it needs another costly device to switch from mains to generator. the selectronics is absolutely not intuitive to program. rebooting the computer or laptop needs a long winded process to start up the software again.
changing a setting is also a long winded process.
at the other hand, there are regular updates. has setting for lifpo4 batteries. is very reliable. runs for 10 minutes at 8.5kwh ( in air conditioned shed though) without problem. the lights don't flicker when motors kick in, etc and many other amazing things.

using the batrium you will need a dc disconnect somewhere 250A.( for emergency disconnect) and they can be costly. batrium longmons are +50mV/-50mV tolerance. now that does not seem much. but with a lifepo4 that is quite a bit difference. according to batrium, they are adjustable, but !!!!!!! they do not trust customers to adjust them. (you can adjust the voltages of the midnite classic). programming is not intuitive either.
at the other hand the software is quite good and with one glance you can see what is happening. you can connect multiple laptops or computers. (only one for midnite and selectronics.)
i had multiple cell wires fail on me . seemingly they had? a problem with the supplier.
i programmed the bypassing to 3.51V per cell. the watchmon records a lot of things, i think out of memory something like 8 years or so. the software uses quite a bit of cpu power. something like 40%. (selectronics 0.5%, 4 midnite classics 22%, victron 0.5 %)
lots of luck
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Re: New offgrid system

Postby Gordon-Loomberah » Tue Sep 11, 2018 5:19 pm

Alternatively Kurt, this might be worth investigating:
https://www.energymatters.com.au/renewa ... a-storage/
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Re: New offgrid system

Postby offgridQLD » Tue Sep 11, 2018 6:26 pm

Thanks Gordon I looked into that quickly yesterday. From what I can see you will need to be connected to the Grid.

Though 6k is a deduction off the grid/battery option but I'm thinking the battery's that qualify for it are perhaps more than 6k more expensive than a calb/Winston DIY bank.....could be wrong.


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Re: New offgrid system

Postby davidg » Wed Sep 12, 2018 4:34 am

offgridQLD wrote:From what I can see you will need to be connected to the Grid. Though 6k is a deduction off the grid/battery option but I'm thinking the battery's that qualify for it are perhaps more than 6k more expensive than a calb/Winston DIY bank.....could be wrong.

Gordon, thats in SA. #just saying

Selectronic, remote access there is several ways not just using an Ethernet adapter.
That programming is the very thing that gives the ability to be really flexible and good at it's job.
If you are going use both an auto start generator and the grid the additional dual supply module makes it a neat result as it bolts inside the inverter. There are other ways, but it's the cleanest option.
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Re: New offgrid system

Postby Gordon-Loomberah » Wed Sep 12, 2018 6:34 am

davidg wrote:Gordon, thats in SA. #just saying


Indeed it is, quite relevant considering Kurt's location!
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