Storage from Off Peak Usage in Peak

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Re: Storage from Off Peak Usage in Peak

Postby DCvolts » Thu Jun 27, 2013 4:35 pm

I am using one of the first Selectronic SP Pro 482 inverter chargers. I think it is a great unit. It manages the off peak charging of the batteries and has much other functionality, faultless so far!

I use the power from the batteries during am and pm peak periods, about 5kwh usually.
peak power price ~46c/kwh
off peak power ~14c/kwh
shoulder ~24c/kwh

so charging batteries at about 80% efficiency. I pay 8c/kwh if you compare to the 24hour standard tariff of 28c/kwh.

the energy supplier gives no rebate to the good guys for the shifting of our power consumption to off peak and reducing their need to invest in and operate very expensive peak power generation!!!
Fill em up mate and enjoy any savings.
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Re: Storage from Off Peak Usage in Peak

Postby davidg » Thu Jun 27, 2013 4:43 pm

DCvolts wrote:I am using one of the first Selectronic SP Pro 482 inverter chargers. I think it is a great unit.

I suppose it's a series 1 (Yellow on the front and Blue metal box)
Have you kept the firmware upto date?
There have been a number of revisions of it for one reason or another.
I'm to blame for one revision, I found a minor bug in the firmware. 8-)
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Re: Storage from Off Peak Usage in Peak

Postby Tracker » Fri Jun 28, 2013 7:26 am

.
David, a silly question... :oops: ... how much difference does a firmware change make in overall performance... :?:
OnT.
I have been commenting to David about my system , which does a similar job... using old VRLA Batteries .
(Considered very unsuitable for cyclic usage .. :cry: )
I try to rely on PV to do all the work, so that nothing comes from the grid, but being interested in general efficiency, and with the dismal weather in Sidiney over the last days, I switched off the solar and relied on OffPeak recharging, and measured the Import/export power to a circuit powering ONLY REFRIGERATORS..
I found the apparent ratio to be 2:1.. most disappointing , until you consider the issue of Power Factor, and that some kWH meters just don't respond well to measuring power to purely inductive loads.... ie. Fridge Motors
I know that I would be better working on the DC side, but I really don't want to get into data logging at this time.
Anyway , I am confident that the inverter and the charging efficiencies are normal, and so the apparent 2:1 is just crap..
..
.
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Re: Storage from Off Peak Usage in Peak

Postby davidg » Fri Jun 28, 2013 7:37 am

Tracker wrote:David, a silly question... :oops: ... how much difference does a firmware change make in overall performance... :?

Typically not much, but any improvement is an improvement ;) but if one of the things you are trying to use or do is within an issue and that issue that has been resolved then you never know, they don't say what has been changed, they just say there is a new version so I can't say what it fixes or improves unfortunately.
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Re: Storage from Off Peak Usage in Peak

Postby Majik » Thu Jul 04, 2013 6:12 pm

I appreciated all the input.

We have three rates:
* off-peak 10pm to 7am 10.1 cents
* shoulder 8pm to 10pm and 7am to 2pm 19.4 cents and
* peak 2pm to 7pm 47.77 cents per kWh.

After reading the various input I am satisfied that charging from the grid during low rate times, and using later is not an economic proposition.

It also seems to me that a lot of research must have been published at the various academic institutions. Where to access all this?

As for my site www.solar-cell-panels.com the purpose is to bridge the gap between technical and the household user. I have looked at a lot of information on the web, but as often happens the required information gets lost in the volume. To transcend this seems to be a noble objective, albeit a very challenging one.

Pity the poor users with kW, kWh, FIT, rebates, PV and so on.

Again, thank you for the education.
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Re: Storage from Off Peak Usage in Peak

Postby davidg » Thu Jul 04, 2013 11:29 pm

Majik wrote:We have three rates: * off-peak 10pm to 7am 10.1 cents

Hell I wish I had it that cheap and I wish mine started at 10pm that would be great. It would make a faster ROI thanks to the mix of Solar with load shift, Solar is the trick, without it will not make the ROI overtime. 8-)
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Re: Storage from Off Peak Usage in Peak

Postby Majik » Fri Jul 05, 2013 8:01 am

davidg, I will be interested in learning more about the solar ROI, but I will raise that, hopefully shortly, on a new post. Interesting that you still consider load shift to be a component of the solution. Thank you for your input, best wishes, Majik
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Re: Storage from Off Peak Usage in Peak

Postby FarmerJohn » Fri Jul 05, 2013 8:25 pm

So, its easy to show that there is no ROI with Lead Acid.

What about LiFePO4 with their alleged 5000 cycles, 70% DOD and 95% efficiency.

Solar is always going to help, but what if you just want, what is effectively an efficient, large (house sized) UPS and let it only charge off peak.
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Re: Storage from Off Peak Usage in Peak

Postby davidg » Fri Jul 05, 2013 8:48 pm

FarmerJohn wrote:Solar is always going to help, but what if you just want, what is effectively an efficient, large (house sized) UPS and let it only charge off peak.


I do that now on lead-acid check below 1100ah of batts 2 houses but with solar boost, we are not nice on power for 17 hours a day I think we worked out at about 16-20kWh's, at this time of the year. About 4-5kWh's of off-peak used per day mainly battery recharge for the drop off at 0600. More during summer but then we produce a lot more then too.

Assuming no A/C or similar horrid loads, you may get away with it, but Solar will have a big impact and you might just get away with minimal off-peak power as well, maybe none at all most of the time. 8-)
Last edited by davidg on Fri Jul 05, 2013 8:55 pm, edited 2 times in total.
SPS Standalone Power System/Hybrid specialist - Store the Sun!
SELECTRONIC SPMC482-AU, 8.2kW's of Arrays
Selectronic Certified AC-Coupled Fronius 8.2kW Inverter
1900Ah 48V Bank

An OTT Genset for a house.
PVOutput Stats

Sparkys light up your life :)
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Re: Storage from Off Peak Usage in Peak

Postby Majik » Fri Jul 05, 2013 8:53 pm

I expect research would have established the facts. Surely someone has done the research. Question is: where can we find the research report? It would be interesting to see.
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