What options do I have - upgrade

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Re: What options do I have - upgrade

Postby australsolarier » Mon Sep 11, 2017 3:01 pm

lithium batteries are only more pricey than lead acid batteries in the short run. when you do the math, they are actually cheaper. you can discharge them deeper and many more cycles. an can charge and discharge much larger currents than a lead acid.
there are many threads about this on this and other fora.
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Re: What options do I have - upgrade

Postby Newt » Mon Sep 11, 2017 5:13 pm

For sure...I have read about them,. its having enough up front cash to buy them. No govt assistance for batteries unfortunately....they want us to burn coal.
Last edited by Gordon-Loomberah on Tue Sep 12, 2017 1:40 pm, edited 1 time in total.
Reason: removed unnecessary quoting
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Re: What options do I have - upgrade

Postby davidg » Mon Sep 11, 2017 9:30 pm

Newt wrote:No govt assistance for batteries unfortunately....they want us to burn coal.

If there was, they still would not be any less and every rubbish brand would be involved as well.

They would just be more and a rebate would bring it back to about the same cost. We really don't want get a so called rebate inflicted on us. It will hurt more it will help.
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Re: What options do I have - upgrade

Postby australsolarier » Tue Sep 12, 2017 6:29 am

newt,
if you have no money. or do not want to spend any. the other possibility is to cut down with your power consumption. you have one lamp in the house. it is doable. i lived for 2 years with one solar panel and two ex australian army tank batteries. heating and cooking and hot water was with wood though.
in this situation your present system is more than enough. however i had a partner that was quite happy with this situation.
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Re: What options do I have - upgrade

Postby Warpspeed » Tue Sep 12, 2017 10:25 am

Newt wrote:

Can I use two MPPT contollers - the old and and the new one? I doubt it.

Any advice would be appreciated.

Thanks
Newt


Probably best to keep everything you already have exactly as it is, and just add more panels and a second mppt controller to the same battery.

Each mppt controller sees its own panels and a battery connected to its output. It does not "know" there are alternative charging sources for the battery. It just measures the voltage across the battery and decides when it is fully charged and stops any further charging.

The only thing you may need to be aware of, is that peak charging current from both controllers is not going to be too much for the battery to handle, but that depends on battery size and chemistry. As your system grows, adding extra battery capacity is logical so that should never become a practical limitation.

As previously mentioned, east and west facing panels will start working at least an hour before, and an hour after north facing panel output drops to zero.
Depending on your latitude and time of year, the sun can rise and set well to the south of due east west, and can actually rise and set well behind north facing panels.

This extra couple of hours of extended solar power can make a big difference during the morning peak in consumption (breakfast) and the evening meal peak in consumption. And that can significantly reduce the demand on the battery at those times, so its well worth the effort.

The grid tie people know east west panels minimizes grid consumption and maximises feed in tariff.
The same effect can be had off grid, but in this case its reducing the load on the battery rather than the grid.
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Re: What options do I have - upgrade

Postby Newt » Tue Sep 12, 2017 1:34 pm

[Moderator - no need to quote entire previous postings, just a relevant line or few words is plenty, and if it is the previous post, then there is probably no quoting required.]



australsolarier wrote:newt,
if you have no money. or do not want to spend any. the other possibility is to cut down with your power consumption.



I will be upgrading and spending...but I think the Li batteries will be too much for the storage I need....bit early yet, I'll see in a few weeks after moving is over with. I'm quite apt at living frugally, I could happily live in a cave, doubt the mrs would though..haha.
Last edited by Gordon-Loomberah on Tue Sep 12, 2017 1:39 pm, edited 1 time in total.
Reason: removed unnecessary quoting
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Re: What options do I have - upgrade

Postby Newt » Tue Sep 12, 2017 1:36 pm

Probably best to keep everything you already have exactly as it is, and just add more panels and a second mppt controller to the same battery.


Thanks...yep, from the advice I have received here it makes the most sense. I am buying 14 used 190W panels this week with racking and wiring which will be roof mounted east/west.
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Re: What options do I have - upgrade

Postby Warpspeed » Tue Sep 12, 2017 1:40 pm

That will give you more flexibility to tune your second mppt controller to suit the new added panels.
Also it gives some redundancy if something fails, or needs to be disconnected for maintenance.
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Re: What options do I have - upgrade

Postby jaahn » Thu Sep 14, 2017 1:37 pm

Newt wrote:
--- I am buying 14 used 190W panels this week with racking and wiring which will be roof mounted east/west.

Hi Newt :)
That is very sensible and great value probably with careful shopping.
Also you do not have to face them exactly east or west. The house orientation will determine that of course but there are no exactitudes in solar as I see it. If you setup for the max output in winter then the summer will look after itself. Particularly away from the coastal weather perhaps.
You could get second hand batteries too like that guy with the used laptop batteries, but that seems extreme to me !! :geek:
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Re: What options do I have - upgrade

Postby Newt » Thu Sep 14, 2017 5:56 pm

Thanks Jaahn

The panels are STP190 18/Ud , $1150 for the lot inc racking wiring etc. It seems they are good panels. It also comes with a tie grid inverter which I don't need. No doubt I'll be asking some dumb questions re wiring, diodes, junction boxes etc. The person selling is up grading, panels seem quite common used these days.
I'll be buying new batteries....AGM x 16 at the minimum.


Cheers
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