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Author Topic: Big re-work at Nowty Towers.  (Read 5341 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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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
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

7.07kWh PV system with Solar edge
7.2kWh Pylon tech battery storage
18kWh Heater Storage
Solar I boost charging 12kWh 210 ltr OSO system tank
Deep insulation, air leak controlled home
Zoned & Balanced CH wet system
Hive 2
Low energy bulbs
24 kW Leaf
Masanobu Fukuoka garden & wooden hot tub
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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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
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

7.07kWh PV system with Solar edge
7.2kWh Pylon tech battery storage
18kWh Heater Storage
Solar I boost charging 12kWh 210 ltr OSO system tank
Deep insulation, air leak controlled home
Zoned & Balanced CH wet system
Hive 2
Low energy bulbs
24 kW Leaf
Masanobu Fukuoka garden & wooden hot tub
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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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
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

7.07kWh PV system with Solar edge
7.2kWh Pylon tech battery storage
18kWh Heater Storage
Solar I boost charging 12kWh 210 ltr OSO system tank
Deep insulation, air leak controlled home
Zoned & Balanced CH wet system
Hive 2
Low energy bulbs
24 kW Leaf
Masanobu Fukuoka garden & wooden hot tub
sam_cat
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Bristol, UK


« 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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Sunny North-East Hampshire


« 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
New (Old) 8S7P LiFe battery, 105Ah @ 26.4V
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

12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
kdmnx
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« Reply #40 on: February 23, 2020, 10:49:50 PM »

If you are generating power but your battery packs and stored heat are full then that means you need a bigger battery pack or bigger thermal store...
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12x JA Solar 340Wp panels (total 4080Wp)
Lux Power inverter charger
5x PylonTech 2000 2.4kWh batteries (total 12kWh (11kWh usable))
nowty
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« Reply #41 on: February 23, 2020, 11:51:39 PM »

If you are generating power but your battery packs and stored heat are full then that means you need a bigger battery pack or bigger thermal store...

Or maybe I have too much PV. whistlie

Only happens in July or if we are away and not using the power / hot water.
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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
dan_b
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SW London


WWW
« Reply #42 on: February 24, 2020, 09:48:05 AM »

You need a bigger EV  signofcross
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3.06kWp SolarEdge system with a split array:
2.18kWp 10x South facing, plus 4x West facing 880W

Mk1 ImmerSUN DHW diverter
4kW PowerVault Battery

Tesla Model 3 Long Range
nowty
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« Reply #43 on: February 24, 2020, 10:59:00 AM »

Latest addition here at Nowty Towers is the use of several spare PV panels I have, temporarily connected October to March whilst I am not using the decking area.

I am utilising a Charge controller and directly DC coupling it to my home battery. This has the advantage of,

1)   Not increasing any more grid tied PV so its DNO friendly.
2)   Increasing the maximum battery charging power of my system which will be very useful to me in March with the high outputs and short days.
3)   Provides automatic PV power limiting if the battery is full.




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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
nowty
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« Reply #44 on: July 18, 2020, 09:47:52 PM »

After being a bit tardy on the manual battery balancing routine, I had a spot of bother a few months ago. help

I let the battery bank drop to quite low, the Pylontechs had already dropped out and the Growatts were around 10% SOC but they had been there before with no trouble, but not for about a year. This time 2 cells almost flattened unexpectedly. The voltage dropped away rapidly and after recovering the situation I decided to review my setup and operating regime. facepalm

Anyway, long story, short, I had decided to split the Growatt bank into two so I can take half offline for maintenance any time I like. Each battery bank will be a more manageable size, whilst each one still being able to operate at full charge / discharge power. But earlier this year I increased the size of my battery bank from 8 to 9 Growatt units, but 9 wont divide by 2. Oh dear, looks like I had to buy another one to make it 10.

So I now have 10 growatt battery packs, now split into two banks of 5, plus the Pylontechs as a third battery bank. So thats now 48 kWh's of Growatts, plus 19kWh's of Pylontechs = 67kWh's. stir




As I had to modify the fuse distribution, I decided to upgrade it. So, from several copper strips bolted together that ran quite hot to a single continuous copper sheet. Now it hardly gets warm at full load, so much better. bike

BEFORE


AFTER



Also I bought a couple of these active cell balancers from China after I saw a review of them on youtube.
https: //www.youtube.com/watch?v=-RfMKpyHkm4

They arrived today so looking forward to playing with them. They are supposed to work all the time and can shift up to 5A between the cells, based on cell voltage difference. I am hoping they will be my answer to long term cell drift. fingers crossed!

Front



Back
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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
300,000+ litres of water harvested from underground river.
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