free of the chains

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free of the chains

Postby poider » Sun Oct 22, 2017 9:29 pm

I live in suburban Adelaide, I have 16 solar panels on my roof and 1 Delta solivia 5.0 inverter.
The system produces an average of 8.45 kWh of power per day, we use an average of 6.14 kWh per day, I (and I am sure most people) and pretty annoyed that I produce more than I need but still I am made to pay the power company for using less than I produce.
Are the current battery / powerwalls able to store that much energy and if I buy one will i be able to get free of the power companies ? or will I need to buy solar panels and batteries from an independent source and have them run independently of my current solar systen that was purchased through the power company?
Thank you
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Re: free of the chains

Postby davidg » Mon Oct 23, 2017 12:05 pm

poider wrote:The system produces an average of 8.45 kWh of power per day, we use an average of 6.14 kWh per day, I (and I am sure most people) and pretty annoyed that I produce more than I need but still I am made to pay the power company for using less than I produce.


Averages are not useful for considering "standalone" or self consumption assuming you don't want to use the grid. What needs to considered is the peaks of demand and the lack of solar generation that occurs periodically once you have those then you have to decide if the grid is a good backup to keep for when you have a shortfall or go for some other option such as a generator really larger battery with a really large array of PV or a wind turbine assuming you have enough wind available periodically, etc.

Most of the marketing hype greatly simplifies what really needs to be considered.

if wanting to self-consume what you already have and using the grid for shortfalls and being able to ride through a power blackout, then maybe Selectronic with batteries could be an option where you can expand to a more expansive system as time goes on possibly going completely standalone at some stage, should you wish to.
Last edited by davidg on Mon Oct 23, 2017 12:38 pm, edited 1 time in total.
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Re: free of the chains

Postby poider » Mon Oct 23, 2017 12:23 pm

Thank you David, i will have a look at that
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Re: free of the chains

Postby Gordon-Loomberah » Mon Oct 23, 2017 2:34 pm

poider wrote: I have 16 solar panels on my roof and 1 Delta solivia 5.0 inverter.
The system produces an average of 8.45 kWh of power per day...


What size panels are they? Do they suffer from serious shading?

16 typical 250W panels should average about double your stated 8.45kWh (energy, not power) per day in Adelaide from an array with good sun exposure.

Perhaps you mean that you export 8.45kWh/day, and you import 6.14kWh/day?
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Re: free of the chains

Postby poider » Mon Oct 23, 2017 7:00 pm

Hello Gordon, I have 18 x 200 watt panels, they are in a western orientation, as the roof could not fit them on the northern side.
The numbers I use are from my electricity bill, from my recent Winter bill....my usage figures are :

Current read 9029
Previous read 8467
equals 562 kWh

Then from the feed in credit

Current read 14330
Previous read 13880
equals 450 kWh

The average usage and generation figures are from these totals and are averaged out over the thirteen bills i have records for.
Am I doing it wrong?
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Re: free of the chains

Postby poider » Sun Dec 03, 2017 4:06 pm

So now that I know what is happening a bit better,I can better state my averages.
I generate on average, so far this bill, 15.5 kWh per day, we use an Average of 9.1 kWh per day.
I know that my typical good sunny day is as follows.....

Over 24 hours
Generate....24 kWh
Export.......20 kWh
Import.......1.6 kWh
so from my generated (24 kWh) I take out what I exported (20 kWh) that leaves what I used of the generated energy (4 kWh) , then I add what I imported (1.6 kWh) and that is my Total usage (5.6kWh)
So my bill for that 24 hours is $2.17 credit
Supply charge .91 cents debit +
Imported .59 cents debit -
Generated $3.67 cents credit = $2.17.
When first we got the system I rang them and spoke intensively with them to try and understand and they gave me the impression that we exported everything we generated, then paid for every thing we imported.
Now that I have worked it out I see the error in my initial judgement.
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Re: free of the chains

Postby Gordon-Loomberah » Sun Dec 03, 2017 8:18 pm

poider wrote:...they gave me the impression that we exported everything we generated, then paid for every thing we imported.


That's how gross metering works (financially, but not in practice, you still use some of what you generate), which I suspect you have never had, so the person you spoke to must have not understood how net metering operates.
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