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Author Topic: More PV @ Courtiestown  (Read 34744 times)
linesrg
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« Reply #30 on: February 08, 2018, 06:25:17 AM »

sam_cat,

Looking at the Growatt ShineBusPlus manual it looks like I may already have a parameter that would allow me to limit the output. There is a Discharge Power Limit Setting. It isn't clear whether this refers specifically to the grid output and/ or battery charging but I'm assuming the former?

I did briefly plug a cable in to the Growatt and a laptop before I came away but wasn't able to get the two devices to communicate. I do also have one of the Growatt wireless devices.

I'll need to look at this some more when I get back home on the 13th.

This is certainly going to be a cheaper option than the SMA one I was looking at.

Regards

Richard
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1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
sam_cat
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« Reply #31 on: February 08, 2018, 09:39:08 AM »

sam_cat,

Looking at the Growatt ShineBusPlus manual it looks like I may already have a parameter that would allow me to limit the output. There is a Discharge Power Limit Setting. It isn't clear whether this refers specifically to the grid output and/ or battery charging but I'm assuming the former?

I did briefly plug a cable in to the Growatt and a laptop before I came away but wasn't able to get the two devices to communicate. I do also have one of the Growatt wireless devices.

I'll need to look at this some more when I get back home on the 13th.

This is certainly going to be a cheaper option than the SMA one I was looking at.

Regards

Richard

Awesome!
Its not something I have any direct experience of, but I bumped into it on my travels (around the internet) a while ago and it seemed interesting and something that I might need in the future (planning on max solar that the property can take, roof+veranda+maybe garage so 8kw+, so need a way to limit export). Growatt when I have contacted them in the past have been quite responsive and helpful, so might be worth a call when your back and have sat down with it and had a good look.

Smiley

Be sure to let us all know how you get on.
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Mike123
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« Reply #32 on: February 08, 2018, 12:24:12 PM »

The Growatt BATTERY charger/inverter will not limit your export. Bit it is probably possible if you have Growatt GTIs

The SP2000 discharge limiter, is merely to limit the amount of discharge from the battery. I believe the default is 0, so you could change it to 10%, but I've learnt not to tinker too much, after "bricking" an SP2000 whilst doing a firmware update (DON'T EVER TRY TO DO A FW UPDATE!)

In normal use - obviously - if you are exporting, the SP2000 should react with about 1 minute, and start charging the battery, assuming it needs charging. But it'll only take the amount of charge it wants, so if there is still excess, then you will continue to export

I didn't know you needed -21 SB GTIs for export limitation. I'd certainly talk to SMA Germany and see if they have any suggestions for -20 GTIs. I've found them to be very helpful
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« Reply #33 on: February 19, 2018, 02:44:46 AM »

Good Evening All,

(This sent from somewhere off the Peruvian coastline). Whilst waiting for a reply from SMA about a -20 inverter I've been looking at yet more options.

I see an Aurora PVI-3.6-TL is both G59/ 3 selectable and also has a reactive power capability to reduce output. Anybody with experience, good or bad, with these inverters?

Regards

Richard
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1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
linesrg
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« Reply #34 on: March 07, 2018, 03:26:42 PM »

Good Afternoon,

It definitely snowed here again yesterday but now a JCB has ploughed its way up the track things are kind of getting back to normal.

Following a suggestion from nowty I reset my Immersun 2 to allow an export of 300W before it diverted power (to the immersions in the EHS), I don't know why I didn't think of this myself but there you go.

The SP2000 appears to be working properly in that it was trying to charge the battery unit. The batteries are showing 46.6V and only 1% capacity. Sad but then they haven't been charged since at least June to my knowledge and I don't know what success the previous owner had.

Next step is taking the cover off the battery unit and seeing how to get around the BMS and charge the batteries direct to get some power into them as I still need to test that the SP2000 is fully functional and will discharge the charged batteries.

I am still intent on replacing the SMA SB1700 inverter with an Aurora PVI-3.6-TL, just waiting for a unit at the right price.

Regards

Richard
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1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
Mike123
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« Reply #35 on: March 08, 2018, 09:50:22 AM »

Assuming you have some sun shine, you can fool the SP2000 into thinking you're exporting simply by turning the clamp around in the consumer unit. Then the SP2000 will charge the battery - no need to open things up and void any warranty you might have. You can leave it like that for days, and it won't discharge battery at all - obviously, since it will continue to think you're exporting all the time. The battery should become fully charged

My SP2000 will discharge down to 0% each night, then if there's ANY sun the next day it will force-charge the battery back up to 10% - even if I do not export at all
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linesrg
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« Reply #36 on: March 08, 2018, 10:34:49 AM »

Mike123,

Warranty isn't an issue but that is a clever suggestion re the sensor clamp.

Now is charging the Growatt battery better use of the electricity generated than heating the water in the EHS?Huh??

Regards

Richard
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1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
Mike123
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« Reply #37 on: March 08, 2018, 11:28:56 AM »

No it isn't, but it will prove to you that the battery is good

The battery should be fine, normally if there's a problem you'll know by the colour of the LED. Solid Red = BAD!, Flashing Red = VERY low battery

Also if there's an imbalanced cell you'll normally get a BMS Error on the SP2000 which = VERY BAD. Growatt would normally either replace that whole battery or take apart and charge the cell on it's own

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« Reply #38 on: March 08, 2018, 12:31:13 PM »

Late to this, but my setup has 4x CT clamps all next to eachother and they all seem to co-exist ok.

1. ImmerSUN CT
2. PowerVault CT
3. UKPN Battery Trial clamp 1
4. UKPN Battery Trial clamp 2

The first 3 are all on the same cable, the 4th one is on a different one but it's physically about 3cm away.



As I understand it a Home Manager system 'Speedwire' needs to be hard wired. I knew there was a reason I ran a second CAT 5 cable from the Utility Room roof space (the first was to connect the heat pump to the router on our landing). I'd need to run another CAT5 cable from the incoming point on the far side of the outbuildings (I'll be able to secure it to the one already in place for the Immersun).

How many CT's can you have at one point? There will be:-

1. the Immersun
2. the Growatt
3. the Home Manager

Thoughts welcomed.

Regards

Richard
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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
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« Reply #39 on: March 08, 2018, 03:07:49 PM »

Dan - which of the CTs (which inform the creation of a load) takes "priority"? i.e. does Immersun operate using all export until DHW satisfied, then PowerVault charge using all export, or do they "share" the export simultanously?

If this is the case and you wanted it the otherway around, how would you go about changing the order of operation?

(I guessing the way they operate depends on the sampling frequency but can't quite my head around how that would work)
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Thermal: 4x Schott ETC16
PV: 3.9 kWp (20xSchott Mono Perform 195Wp)
Boilermate Thermal Store
SMA SB400TL-20
Clearview Pioneer 5kW
Woodwarm 9kW
Windsmithy Arthur 6kW
1 anemometer (sadly no turbine)
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« Reply #40 on: March 08, 2018, 06:54:50 PM »

In my system, it turns out that the PowerVault always takes priority ahead of the ImmerSUN. I donít know how but It works!   With the PowerVault charge limit of 800W I can get a situation where both devices will charge/divert at the same time, which is nice.
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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
linesrg
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« Reply #41 on: March 08, 2018, 08:11:44 PM »

Good Evening All,

I was also wondering about how the Growatt/ Immersun would interact.

If I tell the Immersun to export say 300W, then the Growatt will see this export and divert it to charging the battery. In so doing it will remove the 300W export so the Immersun should 'release' another 300W???

This would continue until the Growatt was using the maximum available power from the available panels?

At this point the Immersun would be able to 'settle' the 300W output?

There certainly seemed to be some confusion, particularly once the cloud came across causing varying output.

Thoughts?Huh

Regards

Richard
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1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
nowty
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« Reply #42 on: March 09, 2018, 05:53:48 PM »

Yes thats how it works, I have experimented with different amounts of min export on the Immersun to see if the Growatt would increase its charge rate any faster but it does not.

I found that my two Growatt work ok with the Immersun set to 250w min export. If you only have one Growatt you may get away with using 150w or 200w.

Unfortunately the Growatts dont work too well with fluctuating Sun or fluctuating house loads (like washing machines). They ramp up their charging very slowly and cut out the charging as soon as there are any disturbances, then slowly ramp up again.
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11kW+ of PV installed and 56+ 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).
260,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
linesrg
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« Reply #43 on: March 19, 2018, 02:58:08 PM »

Good Afternoon All,

Whilst I haven't been monitoring the PV output via the Immersun readout all day I did see the system putting out 5623W at one point earlier this afternoon.

Given the house was using some 650W and the Immersun was diverting 2.7kW to the immersion in the EHS there was little risk of exceeding my allowed single phase limit.

I am part way through acquiring a Aurora inverter to meet my DNO specified G59/ 3 requirement.

My biggest headache is getting either of my two Windows laptop devices to 'talk' to the Growatt. The whizzo cable is assigned COM 3 on both devices but I can't get any communication going.

The SP200 charges the batteries to '5%' then the battery temperature out of range alarm comes up.

Any suggestions?

Regards

Richard
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1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
nowty
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« Reply #44 on: March 19, 2018, 06:29:19 PM »

Have you got a USB to serial FTDI cable ?

Like this, https://www.ebay.co.uk/itm/USB-to-Serial-Adapter-High-Quality-FTDI-CHIPSET-RS232-BT232-WIN-7-8-10-DB9-/151406431857

And not some cheap rubbish like this, https://www.ebay.co.uk/itm/USB2-0-to-Serial-RS232-RS-232-Cable-Converter-Adapter-DB9-Win-7-8-10/330722083342?hash=item4d0092820e:g:N2AAAOSw4HVWEPOQ

The former works plug and play without having to install the correct drivers, the latter might work if you have the driver and it installs properly.

I had the same issue over a year ago and Camiltech put me right on this.
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11kW+ of PV installed and 56+ 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).
260,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
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