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Author Topic: Big re-work at Nowty Towers.  (Read 2297 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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11kW+ of PV installed and 54+ MWh generated.
Lithium battery storage of 50+ kWh.
Hot water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
250,000+ 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 210 ltr OSO system tank.
Balanced & zoned CH wet system & Hive 2
Wood fired thermosiphon cedar hot tub.
Masanobu Fukuoka inspired veg garden & fruit trees
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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11kW+ of PV installed and 54+ MWh generated.
Lithium battery storage of 50+ kWh.
Hot water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
250,000+ 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 210 ltr OSO system tank.
Balanced & zoned CH wet system & Hive 2
Wood fired thermosiphon cedar hot tub.
Masanobu Fukuoka inspired veg garden & fruit trees
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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11kW+ of PV installed and 54+ MWh generated.
Lithium battery storage of 50+ kWh.
Hot water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
250,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
pantsmachine
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« 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 210 ltr OSO system tank.
Balanced & zoned CH wet system & Hive 2
Wood fired thermosiphon cedar hot tub.
Masanobu Fukuoka inspired veg garden & fruit trees
sam_cat
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« Reply #37 on: April 23, 2019, 08:15:02 AM »

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.


A wise man once said "Its easier to beg forgiveness than to ask permission".... But your mileage may vary...
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Nickel2
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Method mixed with Madness


« Reply #38 on: April 23, 2019, 08:32:34 AM »

I visited an fellow engineer's house in Frederick, Virginia in the 80's. His family house had what I suppose today is called ASHP heating. There was one unit mounted on a pad outside that was ducted to the house. In the winter (down to minus lots) the control lever was pushed one way and hot air directed into the house; in summer, the lever went the other way, and the same unit directed the hot air out. He reckoned it was as cheap as GCH to do the house, giving a 3:1 return on cooling.
I had never seen anything like it, only hot-water filled radiators in winter and open windows in summer. If I could live life over again, I'd do that, but with a domestic solar farm running it. If only...
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1.140kW mono south-facing at 49*
EpEver 4210A at 24v
24V 400 Ah battery. (4x200Ah FLA)
EpEver STI1000-24-230 pure sine inverter
Of course it'll work. (It hasn't caught fire yet).
nowty
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« Reply #39 on: May 02, 2019, 04:53:52 PM »

Not much to report apart from its all working well, we are well into the peak solar season now and looks like there will be no more energy import (gas or leccy) until October.

To make it easier to monitor my batteries, I have installed a remote voltage monitor in my lounge. I had one for the old system too, but needed to change the voltmeter to work on the higher voltage.




Also installed a remote test point so I can keep an eye on cell voltage imbalances, so far no imbalances worth mentioning.
« Last Edit: May 02, 2019, 04:59:15 PM by nowty » Logged

11kW+ of PV installed and 54+ MWh generated.
Lithium battery storage of 50+ kWh.
Hot water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
250,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
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