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HarmLessSolutions
969 posts

Ultimate Geek

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  #3315420 3-Dec-2024 09:14
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chimera:

 

Those posting solar usage graphs for November with large PV systems, I'd be curious to know how often your PV generation exceeded your load + your export to grid (I'm assuming) capped at 5kw.  Eg: solar 9KWh, load 1kW, export 5kW.  3kW wasted at those points in time. 

 

 

This is our system's performance on a high production day. 9.5kW of north facing panels into an 8.2kW single phase inverter. Consumption first thing is the Paladin HWC diverter, then a period throttled by export cap before the Evnex EVSE starts charging our Polestar2. A slight dip about 3:30 before the Leaf was plugged in to charge. On high input days it's a matter of scheduling consumption to avoid inverter throttling as this is the worst possible scenario as a total waste of potential generation though on the day of the data below it probably only amounts to 2kW average reduction for a couple of hours so 4kWh @ 17c FIT = 68c

 

Once our system got up and running in its present capacity it quickly became obvious to us that export lead devices that use only solar generation that would otherwise be exported are the key to maximising the economics of solar. Note the brief dip for the Evnex charging about 30 minutes in the charge. On a partly cloudy day those dips are filled by grid supply if the device isn't clever enough to throttle back consumption.

 

Bear in mind that the best strategy is to only consume enough to reduce export to 5kW or less. If you plug everything in to charge to gain total self consumption you will end up with everything charged before generation falls to 5Kw + background consumption and then be forced into inverter throttling due to your running out of things to charge.

 

Also our present grid excess voltage issues are restricting the inverter's output and export has been restricted to ~4kW which is frustrating.

 





https://www.harmlesssolutions.co.nz/


RobDickinson
1524 posts

Uber Geek


  #3315434 3-Dec-2024 09:47
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chimera:

 

Those posting solar usage graphs for November with large PV systems, I'd be curious to know how often your PV generation exceeded your load + your export to grid (I'm assuming) capped at 5kw.  Eg: solar 9KWh, load 1kW, export 5kW.  3kW wasted at those points in time. 

 

 

I'm capped usually mid day or in the afternoon if its sunny. Before then the PW and water are sucking up electrons so I can hit the 10kw or so cap from the system

 

After that I struggle to use up 10kw (no surprise) so often capped by the 5kw export

 

The point for me with a 10kw system is bad days not good days

 

 


thewabbit
127 posts

Master Geek

ID Verified

  #3315436 3-Dec-2024 10:15
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RobDickinson:

 

The point for me with a 10kw system is bad days not good days

 

 

 

 

 

 

That was what I struggled with when getting quotes to get mine installed (6.2kw panels, 6kw inverter). Three companies tried to sell me on systems that would produce enough to cover peak usage during peak summer... I want to provide as much cover during peak usage in the middle of winter. I was surprised so many didn't do that.

 

 

 

What also surprised me when we got quotes was that only one company physically measured my roof, all others relied on thier quoting tool(s) using aerial/satellite imagery (I've been in the GIS/Spatial industry for 10+ years so I do know that this method is largely sufficient for these types of measure ments). But, lo and behold, the comapny that measured my roof, found they could actually fit panels on in portrait (providing future expansion). All other quotes had the panels on as landscape leaving no room for future expansion


chimera
506 posts

Ultimate Geek


  #3315481 3-Dec-2024 13:52
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That kind of leads me onto the use of batteries... they have come down in price quite substantially, so instead of wasting that extra energy, charging batteries for me so far at least has been quite lucrative (especially in this current weather)   I have 8.5KW panels (all I could fit) with 8KW inverter, with 15KwG (12KwH usable) LiFePO4 expanding to 30KwH (24KwH usable) in about 4-6 weeks time once extra battery arrives.

 

I have 3 tarrifs NIGHT, OFFPEAK, PEAK with costs (ball park) as follows...

 

  • 11pm-7am = NIGHT at 0.14c
  • 7am - 11am = PEAK at 29c
  • 11am - 5pm = OFFPEAK at 22c
  • 5pm - 9pm = PEAK at 29c
  • 9pm - 11pm = OFFPEAK at 22c

I have HWC scheduled to turn on at 6am which uses PV/battery.  At 5pm (peak start) my home automation then checks current PV production (every 15 minutes) and as soon as it drops below 2kW it turns off the HWC (which incidentally uses 3.5kW, but the battery supplements this)  I am adding a sensor to the HWC soon where if temperature gets too low, it will turn on for an hour say 1am-2am. The spa pool is on a similar sort of schedule.

 

The aim is to utilise power in the following order:

 

  • PV
  • Battery
  • Grid (at night rate only, where feasible)
  • Neighbours power (joking :-) 

I grid charge the batteries for 2 hours between 2am-4am (night rate 14c) to top it up. Battery then runs load through the morning and into the start of sunshine hours. Sun then tops the battery up during the day. Load is covered by PV (and battery if necessary, varies obviously) throughout the day with any extra PV being exported (but only if battery SOC is 100%)  I get paid 17c per KwH for export, eg: slightly more than the 14c night rate. Battery then covers load during peak hours from 5pm - 11pm before night rate starts again. Of course, this is all good with plenty of sunshine and will change the pattern in winter.

 

So far it seems pretty viable. Doubling my battery capacity will help somewhat (specifically winter) as I'm averaging down to 20% SOC at around 11pm when night rate starts so if I can charge battery rather than export I'll either be using PV or night rate. So the aim has been to obviously use PV where possible for load + battery.  Export is a bonus, but wifes starting to change habits to use high draw devices (dryer, dishwasher for example) during the day more (or maybe she just needs to learn to hang out the clothes and hand wash... (chill out woke people, just jokes again!!!)

 

Past 24 hours (ignore figures next to the keys, these are just current values as of right now. Pool return pump and heat pump are currently on as is the spa pool at 2500W alone right now, PV is covering all that though)

 

 

 

 

EDIT: oops, missed addition of offpeak at night

 

 


rbensonx
29 posts

Geek

Subscriber

  #3315484 3-Dec-2024 14:04
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I'm doing something similar. See graph for yesterday below

I'm managing mine through home assistant primarily. 

 

 

3phase 13.3kw panels, 10kw inverter, 25.6 kwh (DC Coupled) battery

 

Overnight loads include hot water cylinder and pool heat pump (this time of year).

 

FYI further up October Gen = 1,378 kwh November Gen = 1,459


dantheperson
174 posts

Master Geek


  #3315487 3-Dec-2024 14:11
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chimera:

 

I have 3 tarrifs NIGHT, OFFPEAK, PEAK with costs (ball park) as follows...

 

  • 11pm-7am = NIGHT at 0.14c
  • 7am - 11am = PEAK at 29c
  • 11am - 5pm = OFFPEAK at 22c
  • 5pm - 9pm = PEAK at 29c
  • 9pm - 11pm = OFFPEAK at 22c

 

export 17c, offpeak 22c (+gst?)   5 cent differential.   Is the lifetime cost of the battery close to 5c/kWh ?

I'm on low user/ zero daily fee, so i'm on peak 41 / offpeak 34 / night 20  which makes a small battery for offpeak and peak more viable, but i need to do the maths on moving to standard user now we have a spa pool.

 

Is this a good estimate?  Probably should add 10% cost to cover charge/discharge losses.

 

 

EDIT, wow the editor really stuffed up my table, lets try a screenshot


chimera
506 posts

Ultimate Geek


  #3315490 3-Dec-2024 14:30
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export 17c, offpeak 22c (+gst?)   5 cent differential.   Is the lifetime cost of the battery close to 5c/kWh ?

 

 

The equation isn't really that simple, as sun is out during peak usage too. Plus the battery also supplements the difference during daytime offpeak / peak times when load exceeds pv alone. In other words, sun (aka energy) isn't consistent. But having battery does flatten out those cloudy periods

 

It's a difficult thing to assess, probably need a years worth of data to average it out and work on specific figures. 

 

At a high level, the numbers worked for me at the price I bought batteries for.

 

 


dukezoid
49 posts

Geek


  #3315499 3-Dec-2024 14:59
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Shindig:

This SigEnergy hardware - 18 months in business. Too new, or backed by years of industry experience and a really good option? 


https://www.solarquotes.com.au/blog/sigenergy-review-features/



Let you know next week. Installing this weekend.

Installers love it - stackable, intuitive, super easy commissioning.

CE Tony Xu is ex Huawei - known for quality of inverters.

Lots of discussion online. Going gang busters in UK and AU

https://www.reddit.com/r/SolarUK/comments/1d2q07z/thoughts_on_sigenergy/



LightbulbNeil
57 posts

Master Geek


  #3315502 3-Dec-2024 15:04
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I have several questions?
What brand of batteries have you gone for and where were they obtained from?
What is the cost of the batteries that you have gone for? And what is their expected number of useful years of life or number of cycles?
Thanks
Neil

dukezoid
49 posts

Geek


  #3315503 3-Dec-2024 15:04
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Recommendations for best solar retailer servicing Auckland / Vector?

Octopus looks up there.

Been with Powershop for yonks but buyback is just 13c and they’ll ping me $150 to activate export even if no metering tech visit / hardware change required. Electrician says current smart meter is good to go.

Ta

fastbike
212 posts

Master Geek


  #3315512 3-Dec-2024 15:48
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neb:

 

fastbike: The photo supplied by SolarZero makes no sense to me - what is going on with the rails fastened to the roof ? 

 

That's what the panels get attached to.  So rails get bolted to the roof, then the panels go onto those.

 

 

Yes I know, LoL. I have just installed my own rails and panels.

 

The photos shown in the picture have the spacing all over the place and the placement on the roof is just daft. Maybe that was part of the problem, installers using too much kit, so the installation is not profitable.





Otautahi Christchurch


mentalinc
3225 posts

Uber Geek

Trusted

  #3315514 3-Dec-2024 15:51
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rbensonx:

 

Overnight loads include hot water cylinder and pool heat pump (this time of year).

 

 

Why are you running pool heat pump overnight, do you need it warm for an early morning swim? and how do you have it setup to run like that (My issue is pump and salt chlorinator cause Chlorine level to increase too much)





CPU: AMD 5900x | RAM: GSKILL Trident Z Neo RGB F4-3600C16D-32GTZNC-32-GB | MB:  Asus X570-E | GFX: EVGA FTW3 Ultra RTX 3080Ti| Monitor: LG 27GL850-B 2560x1440

 

Quic: https://account.quic.nz/refer/473833 R473833EQKIBX 


EgorNZ
50 posts

Geek


  #3315516 3-Dec-2024 15:55
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fastbike:

 

The photos shown in the picture have the spacing all over the place and the placement on the roof is just daft. Maybe that was part of the problem, installers using too much kit, so the installation is not profitable.

 

 

Best not to assume the rails were fixed in place in that photo. Looks like it was taken at an early stage of installation and the rails had just been rested on the roof in preparation. Hopefully they were going to fix them higher up near the peak of the roof and not in that valley!


WolfmanNZ
139 posts

Master Geek


  #3315524 3-Dec-2024 16:01
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mentalinc:

 

rbensonx:

 

Overnight loads include hot water cylinder and pool heat pump (this time of year).

 

 

Why are you running pool heat pump overnight, do you need it warm for an early morning swim? and how do you have it setup to run like that (My issue is pump and salt chlorinator cause Chlorine level to increase too much)

 

 

 

 

I too am curious, as having solar and with the way heat pumps work been told best choice is to be running the pool heat pump during the day.

 

 

 

Re: timing of pump/chlorinator I have an old schoiol timer attached to the power unit for the Salt Cell - can set the time that unit runs (turns on pump, salt cell and heat pump comes on when it detects water flow) on my one (which is pretty old) you can vary the output of the chlorine produced with a knob on the power unit - I gather it reduces the amount of current sent to the salt cell so it doesnt create as much chlorine. YMMV.


rbensonx
29 posts

Geek

Subscriber

  #3315529 3-Dec-2024 16:32
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Yep I control the amount of chlorination from the chlorinator, dial it back if its too high. 

 

The issue with using the timer is that the pump keeps running (about 900 watts) even after temperature is reached and the heat pump has stopped. For me keeping it close to temp overnight at night time rate is considerably cheaper. During the day it heats itself if the sun is shining. 

 

The key is a ecowitt based pool temp monitor. If the temp drops below a certain point the pump kicks in and runs till it reaches my peak.

 

Works well.

 

 


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