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Author Topic: Big re-work at Nowty Towers.  (Read 1461 times)
biff
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An unpaid Navitron volunteer who lives off-grid.


« Reply #30 on: April 13, 2019, 08:21:33 AM »

Same as Tod  surrender
            Biff.
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An unpaid Navitron volunteer,who has been living off-grid,powered by wind and solar,each year better than the last one.
nowty
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« Reply #31 on: April 22, 2019, 11:53:19 AM »

We had a perfect example of the SMA active power limiting yesterday.

We were away for a few days and in the wall to wall sunshine we have been experiencing, batteries full, heat storage full, normally no where else for the leccy to go except the grid. whistlie

From 12:00 to 14:00 you can see that over 6kw was being generated (bottom graph) and increasing amounts being exported (the yellow bit) as batteries filled and heat storage was satisfied. Then as the export spikes upwards towards the 3.68kW export limit, probably as my Immersun diverter switched off, the active power limitation cuts in and throttles back my inverters and the generation drops from 6kW to just over 4kW. The export is kept below the 3.68kW export limit (red dotted line) and the active limitation finally is turned off at 6pm when the sun was no longer strong enough to generate enough to bust the 3.68kW limit.

So system works as designed. ralph

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10kW of PV installed and 50+ MWh generated.
Usable battery storage of 45+ kWh.
Hot Water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground Source Heatpump.
220,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
pantsmachine
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« Reply #32 on: April 22, 2019, 01:28:47 PM »

Are you dumping the excess above 3.68kw export as heat?
« Last Edit: April 22, 2019, 01:31:12 PM by pantsmachine » Logged

HUGE insulation depth.
5.12 kw PV system with Solar edge.
4.8 kw Pylon tech battery storage.
All Low energy bulbs.
Solar I boost charging 200 ltr OSO system tank.
Balanced CH wet system & Hive 2
Wood fired thermosiphon cedar hot tub.
Masanobu Fukuoka inspired veg garden & fruit trees, compos
nowty
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« Reply #33 on: April 22, 2019, 06:44:02 PM »

Are you dumping the excess above 3.68kw export as heat?

Yes, but in this case the heat stores are ALL full, therefore without active power limitation the system would export more than 3.68kW.
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10kW of PV installed and 50+ MWh generated.
Usable battery storage of 45+ kWh.
Hot Water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground Source Heatpump.
220,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
pantsmachine
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« Reply #34 on: April 22, 2019, 07:24:44 PM »

Need to install and run some a/c or grow a cash crop? Smiley

Can i ask what your heat storage method is?
« Last Edit: April 22, 2019, 07:28:37 PM by pantsmachine » Logged

HUGE insulation depth.
5.12 kw PV system with Solar edge.
4.8 kw Pylon tech battery storage.
All Low energy bulbs.
Solar I boost charging 200 ltr OSO system tank.
Balanced CH wet system & Hive 2
Wood fired thermosiphon cedar hot tub.
Masanobu Fukuoka inspired veg garden & fruit trees, compos
nowty
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« Reply #35 on: April 22, 2019, 07:28:20 PM »

Need to install and run some a/c or grow a cash crop? Smiley


I think A/C installation is going to be inevitable in the near future but primarily for comfort purposes if last years summer heat becomes the norm.

At least I will be able to run it carbon free.
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10kW of PV installed and 50+ MWh generated.
Usable battery storage of 45+ kWh.
Hot Water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground Source Heatpump.
220,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
pantsmachine
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Posts: 114


« Reply #36 on: April 22, 2019, 07:33:02 PM »

I suggested a/c to my wife a few years back and was shot down. We have it in Turkish house and it is excellent. As it stands with the pv install in Scotland  we have large amounts of excess going forward so a cool Scottish Summer appeals. I may renegotiate as a cool nights sleep is priceless.
« Last Edit: April 22, 2019, 07:37:04 PM by pantsmachine » Logged

HUGE insulation depth.
5.12 kw PV system with Solar edge.
4.8 kw Pylon tech battery storage.
All Low energy bulbs.
Solar I boost charging 200 ltr OSO system tank.
Balanced CH wet system & Hive 2
Wood fired thermosiphon cedar hot tub.
Masanobu Fukuoka inspired veg garden & fruit trees, compos
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