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Cost of solar generation


Gerrie
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I’ve been wondering how much generation in Rand per day vs. Total cost of solar installation. Can it be compared or calculated in some sort of ratio. My own 4KW system generated this over a 24Hr period.

I ran my 3.5KWH pylon tech down to 12% SOC last night, so:

Last nights battery use = 2.9KWH 

Today sunlight use = 5.3KWH (mixing pv & battery)

Battery again fully charged at 14H00

Total = 8.2KWH/day @ R2,20 = R18.04 for today on a R55K system.

Anyone with similar or better cost ratio? Is R18.04 saving per day worth the R55K spent.

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32 minutes ago, Gerrie said:

I ran my 3.5KWH pylon tech down to 12% SOC last night

I would strongly recommend not going below 20% SOC - as apparently the lifespan on the Pylon decreases dramatically when doing so

33 minutes ago, Gerrie said:

Anyone with similar or better cost ratio? Is R18.04 saving per day worth the R55K spent.

A screenshot from my ICC below. I have 4x Pylons though... (and am using R2.03/kWh for the calc)

PV.JPG.40de8f250a6425a9b0b8e18976fee28e.JPG

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7 hours ago, wolfandy said:

I would strongly recommend not going below 20% SOC - as apparently the lifespan on the Pylon decreases dramatically when doing so

I was s bit guilty of abusing the pylon but it was the first time, normally the pylon never goes down below 40% SOC.

 

7 hours ago, wolfandy said:

A screenshot from my ICC below. I have 4x Pylons though... (and am using R2.03/kWh for the calc)

Four pylons, it strongly reflects on that 0.00 Grid kWh used. Thanks for sharing.

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17 hours ago, wolfandy said:

I would strongly recommend not going below 20% SOC - as apparently the lifespan on the Pylon decreases dramatically when doing so

A screenshot from my ICC below. I have 4x Pylons though... (and am using R2.03/kWh for the calc)

PV.JPG.40de8f250a6425a9b0b8e18976fee28e.JPG

Out of interest (and this may be an ignorant question), can you not sell the excess kWh back to the grid on the days you generate surplus?

That'd push the cost savings up even more.

Edited by MongooseMan
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3 hours ago, MongooseMan said:

Out of interest (and this may be an ignorant question), can you not sell the excess kWh back to the grid on the days you generate surplus?

I don't think that my old Axperts are capable of feeding back to the grid

And when I originally looked at it, COCT had not made it very attractive (granted this was mid last year and things might have changed since then)

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Flying in the face of the national crisis which is the failing of the national electricity generation capacity, the refusal of national and local authorities to gratefully accept ANY extra watts flowing into the grid by over-producing domestic generation systems is illogical and counter-productive at best, and treasonous at worst.

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3 hours ago, PaulinNorthcliff said:

refusal of national and local authorities to gratefully accept ANY extra watts

what is the present situation regarding the IPP and SSEG implementation in South Africa? I am not following the local politics anymore (to depressing) 🙁

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I see the City of Joburg and all of it's 'services' (water, electricity, waste) now style themselves SOC (State Owned Company). What the hell? They are paid for and owned by the Ratepayers (you and me). They are not supposed to turn a profit. And yet they are run 'for profit'. They NEED to sell you electricity because they turn a large profit on it!

They would rather see us sit in darkness than sacrifice a revenue stream.

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1 hour ago, Fuenkli said:

 I think the problem is, that the law still does not allow municipalities/cities to purchase electricity from IPP's. 

I suspect even if/when they can purchase from IPP's little will change in terms of trying to not lose the revenue stream. Even if assuming the more nefarious motivations are absent, the income from electricity sales, other than electrical infrastructure upkeep/expansion is potentially also used to fund various other projects (roads etc.). To some extent I think the better your local municipality appears to be run the more likely it is that the lost revenue from electricity sales will not go unnoticed...

41 minutes ago, Tariq said:

You can sell back, if you want to pay about an extra R120 per month fixed cost plus buy a R12,000 bidirectional meter

Try R429 per month basic fee...having to remain a net consumer and municipality purchasing at a lower time based rate than you are paying (to remain net consumer)

Edited by introverter
grammar..spelling..the usual
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1 hour ago, Tariq said:

Oh, did not know that, I thought it was about R289 for CoCT , as we are already paying a basic fee of about R160 plus the R120 odd for feed in

No man, slaapstad already has the mountain and almost everything else - you guys can't also have the highest basic fee - leave something for the rest of us 😉 (was totally unclear from my post but the R429 is not for CoCT... aim a bit west...EDIT: mean east)..

at one stage it appeared to me that google indexed more documents/conference/indaba info about setting SSEG tarrifs and the impact on municipal revenue than info about technical standards and incorporating SSEG to the grid.... anyone bored enough can scan through here for instance

Edited by introverter
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for some stupid reason i can copy or print screen my data from my ICC.  I am running VNC viewer but i cant copy it. 

I have been struggling with low efficiency and low savings on my system since i installed it.

2 Weeks ago I upgraded my battery to Lithium. Now i am saving on average  R25 /day 

 

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Just checking, are all Cape Town people with approved solar installations charged according to this table whether they feed-in or not? Or is that only for feed-in customers?

elec.png.9f0c0bb126ab4020ae5e7ff47190f47a.png

Source: http://resource.capetown.gov.za/documentcentre/Documents/Financial documents/Electricity Consumptive Tariffs.pdf

@Tariq, I can't see the R160/R120 on there, am I looking in the wrong place?

 

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Getting back to the Original question :) 

If I do the same "Straight-line" comparison  I use about 12 kwh of alternative energy (Solar + Batts) so this will give me R 63 saving per day. Keep in mind I live on a farm with prepaid but no line rental so the price per unit is very high but I only pay for what I use from the grid.

 

 

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