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Author Topic: More PV @ Courtiestown  (Read 35162 times)
linesrg
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« Reply #285 on: April 03, 2019, 01:25:40 PM »

Good Afternoon All,

That's the 5kWh Growatt battery price agreed and a courier sorted through Shiply. I think I have enough capacity now. I need to wait for the Sunny Island and battery to turn up now.

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.
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« Reply #286 on: April 04, 2019, 01:12:03 AM »

Good Morning All,

I should be in bed by now but I've been wrestling with an old Elektor magazine switch mode 30V/ 3A bench power supply device that I started a way back in 2010.......

Having found that reading the set-up instructions correctly along with changing the potentiometers around for the current and voltage adjustment means the device is now wired up and working.

The 15A regulated unit I was using is generating way too much heat which I suspect may well be due to having too high a voltage input from the transformer, something to check tomorrow possibly.

This Elektor charger appears to be doing the necessary albeit slowly and means I don't have to go and spend any money on buying something off a well known auction site. Looking at the pictures I see I need to put an earth lead up to the transformer mounting bolt........

A couple of pictures attached. I'll put the lid back on tomorrow once I'm happy no more tweaking is required.

Regards

Richard


* IMG_2996.jpg (205.9 KB, 1280x960 - viewed 343 times.)

* IMG_2997.jpg (218.22 KB, 1280x960 - viewed 357 times.)
« Last Edit: April 04, 2019, 01:14:36 AM by linesrg » Logged

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.
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« Reply #287 on: April 04, 2019, 06:57:56 PM »

So you are making your own charge / discharge system for the batteries then?

How are you going to control that?  I am interested in your algorithm for deciding when to charge the batteries. That is probably easy, whenever there is surplus to do so and the batteries can still accept some charge.

I am more interested in your algorithm to decide how and when to discharge them?  In  particular what inverter you are using and is it fixed power or variable power?
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4KW Solar PV,  4.5KW woodburner, 5KW Air source heat pump
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« Reply #288 on: April 04, 2019, 08:29:47 PM »

ProDave,

I thought I had laid out in this thread what I was doing, maybe I need to go back and re-read bits. The Sunny Island 4.0M will decide how and when to charge the 15.3kWh of ex-Growatt battery.

Edit extra- For the sake of clarity all I'm doing currently is charging each module to 8.4V to make sure that each module is 'good' and when installed in the 'system' all will be near equal.

Regards

Richard
« Last Edit: April 05, 2019, 10:02:51 AM by linesrg » Logged

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.
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« Reply #289 on: April 04, 2019, 09:21:24 PM »

Hi Richard,
Given you have pulled all the cells out of the Growatt, I'm intrigued on how you intend to balance them? Does the Sunny Island have some form of BMS available? 

What took you down the Sunny Island route as it seems a tad more expensive than the sofar ME2000SP /Pylon route.  Does it balance out as you manage to obtain the growatt at a 'good' price?
Cheers
Andy
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6.48kw Solar PV JA (300W)Panels, SolarEdge inverter
Borehole -> Nibe F1255 12kw GSHP -> Radiators
Nissan Leaf
linesrg
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« Reply #290 on: April 05, 2019, 07:24:29 AM »

andrewellis,

nowty made a similar suggestion viz a viz Sofar but I wanted everything 'under one roof' so to speak with bits of equipment that were 'talking' to one another which, in the case of the SMA, they do, literally, via Speedwire.

Based on nowty's experience, with the way he had things set-up, all his modules remain balanced within 0.1V so I'm hoping ( fingers crossed!) that this will be my experience.

I was thinking of putting the Immersun on an Edimax smart socket (controlled by the SHM 2.0/ Sunny Portal) to better control how it was utilised but nowty advised he hadn't found that necessary.

I'm expecting to go through a learning curve with it all once in place.

In terms of expense my philosophy from the outset has been to do all this with second hand/ UBG equipment but even still it isn't 'cheap'.

It is still very frustrating to have 7.3kW of PV and see it only produce 5.8kWh of electrickery on Wednesday.

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.
Iain
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« Reply #291 on: April 05, 2019, 07:58:12 AM »

Hi Richard

Quote
.It is still very frustrating to have 7.3kW of PV and see it only produce 5.8kWh of electrickery on Wednesday

Is that because your system is limiting the output, or other reasons?

Are you able to monitor each set of panels against each other to compare and see which part of the system letting you down? Or is it the area you live or time of year that is giving you generally low readings?

Iain
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1.98kWp PV (11 x Sharp 180 and SB 2.5)
20 x 65mm Thermal and 180ltr unvented
Powervault 4Kw - G200 Lithium-Ion (LiFePO4)
9000ltr rainwater storage   Plymouth
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« Reply #292 on: April 05, 2019, 08:54:17 AM »

...'It is still very frustrating to have 7.3kW of PV and see it only produce 5.8kWh of electrickery on Wednesday'...

I have 1.14 kW worth of panels in my system, but have never seen over 1 kW produced on the best of days. My shortfall is in the storage of power; I can only stuff a certain number of amps into my batteries at one time. As they approach being fully charged, (before switching to float), the maximum DC voltage is capped at 30V to avoid damage to the batteries and the inverter. This means that any further electricity produced has to be used (via the inverter), in a 400W oil-filled rad in the house. Extra heat in the house stops the GCH switching on so much, saving my gas bill.
Power in Watts is power utilised, so if the voltage is fixed and I don't draw all the amps possible at that voltage, then I never reach full power.
I would like a Nissan leaf battery to be able to make use of all power available, without needing to sit by a row of switches turning them on and off as the clouds go by...
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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).
linesrg
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« Reply #293 on: April 05, 2019, 10:01:07 AM »

Hi Richard

Quote
.It is still very frustrating to have 7.3kW of PV and see it only produce 5.8kWh of electrickery on Wednesday

Is that because your system is limiting the output, or other reasons?

Are you able to monitor each set of panels against each other to compare and see which part of the system letting you down? Or is it the area you live or time of year that is giving you generally low readings?

Iain


Iain,

No it was simply a grey, sleety day. Somebody made the observation/ suggestion earlier in this thread that I now have all this PV that I would have more than enough. According to PVGIS-SARAH (most accurate for my location) this 7.3kW will give me 19.2kWh for the whole of December.....................

Since installing the SB3000/ 3600TL-21 inverters I've lowered the voltage at which the MPPT takes place on both inverters to the minimum allowable (125V??) in an attempt to 'maximise' production on dark days.

There is only so much I can do to 'defeat' geography, meteorology and the power of nature etc..

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.
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« Reply #294 on: April 05, 2019, 10:57:17 AM »

Hi Richard

Quote
.Since installing the SB3000/ 3600TL-21 inverters I've lowered the voltage at which the MPPT takes place on both inverters to the minimum allowable (125V??) in an attempt to 'maximise' production on dark days.

Tried that on my old inverter but didn't seem to make much difference. I think the inverter wakes up earlier but still won't connect until a certain threshold. It keeps testing itself until it can produce a certain amount of power. My new inverter kicks in at 30w on the Dc side which is 15 w on the AC side. I think it needs a certain threashold so it won't keep cutting in and out on low light levels. I goes down to 0 w before it cuts out but won't cut in again until it can produce 30/15 watts again.

Iain
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1.98kWp PV (11 x Sharp 180 and SB 2.5)
20 x 65mm Thermal and 180ltr unvented
Powervault 4Kw - G200 Lithium-Ion (LiFePO4)
9000ltr rainwater storage   Plymouth
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« Reply #295 on: April 05, 2019, 05:33:13 PM »

Iain,

You may be right but every little helps is my thinking.

A 100mtr roll of 6mm2 T&E arrived here at the flat today. Only 24kg. After packing and lugging the 2off 28kg inverters yesterday my 'restricted arm syndrome' right arm needs a rest (the kayaking last night won't have helped and nor will the imminent weekend activities either).

It's been a sunny day here, the Growatt battery is full, the EHS has topped out at over 72oC and is currently providing the energy for heating the house (albeit I guess not that much needed although it is due to go down to 0oC overnight) so the Immersun stopped diverting and Sunny Portal tells me that the Active Power Limitation cut in as per the attached log screen shot. If it draws enough energy before sundown the Immersun may do some more diverting yet???

I'm glad to see the system does what it says on the can.

Investigating fitting a zappi to charge the Zoe (if only I could prise it out of the hands of SWMBO)Huh?

I've just added the graph showing the cut in for the Active Power Limitation.

Regards

Richard


* Screenshot 2019-04-05 at 17.34.53.png (394.89 KB, 2544x1242 - viewed 243 times.)

* Screenshot 2019-04-05 at 18.01.55.jpg (99.57 KB, 1280x906 - viewed 245 times.)
« Last Edit: April 06, 2019, 06:32:21 PM by linesrg » Logged

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.
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« Reply #296 on: April 06, 2019, 06:38:14 PM »

Good Evening All,

Currently struggling with a crappy old Dell Netbook as I left the MacBook at the flat........

Whilst waiting on a 100uF/ 63V capacitor and an LM337LZ to arrive to fix the bench power supply I'm currently part way through jury rigging some existing LM2576T devices I have lying around.

That's one currently slowly charging one 8.4V bank and I'm now working on the second one and have a third in the wings. Next up will be investigating the significant heat in the 15A charging device and seeing if I can reduce the AC voltage in from the transformer.

Regards

Richard


* IMG_2999.JPG (136.59 KB, 480x640 - viewed 235 times.)

* IMG_3002.JPG (128.76 KB, 480x640 - viewed 216 times.)
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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.
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« Reply #297 on: April 09, 2019, 09:48:16 AM »

Good Morning All,

Well not much happening currently. One of the LM2576 based chargers has failed and the other didn't even want to start so I'm plugging on with just the one currently. Hopefully the spare parts will have arrived at the house yesterday so I can get the bench PSU back up and running.

The 5kWh Growatt-Darfon battery has been collected but not due delivery until the 18th, the same date as the SI is promised to arrive at the retailers.

Bought a sheet of plywood and cement board yesterday (along with some 10mm2 cable clips and some 'P' clips for the battery cable). The former will provide the mounting board for the SI and the latter will go on top of a pallet as rudimentary 'fire' protection (a la nowty) for mounting the Growatt battery modules.

Looking to be a sunny day today.

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.
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« Reply #298 on: April 09, 2019, 05:40:53 PM »

Good Evening All,

Even more Active Power Export Limitation today than the other day.................

I have constructed another basic LM2576T charger today so that's two at work now. The parts to fix the bench power supply are here so I'll have a look at that this evening.

Heard back from those awfully nice chaps what make the zappi today and they have confirmed that the Zoe requires 2kW before it starts charging, I'm still not convinced that getting one is a good idea as you seem to be left with what do you do with excess energy in the 0 - 1.99kW bracket.

Late Extra - There's lucky, 1off LM2576T, 1off LM337LZ and 1off 100uF/ 63V capacitor and the Elektor bench power supply is back up and running.

Regards

Richard


* Screenshot 2019-04-09 at 17.52.12.png (383.05 KB, 2522x1178 - viewed 140 times.)
« Last Edit: April 09, 2019, 11:39:32 PM by linesrg » Logged

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.
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« Reply #299 on: April 10, 2019, 10:02:16 AM »

Good Morning All,

Well I've tried all the usual sources looking for multi-turn potentiometers to 'finish' my bench power supply. The original Elecktor article mentions 'ideally' fitting multi-turn potentiometers and boy am I struggling to find such beasts given what have proved to be 'odd' values they've selected in this circuit.

I'm looking for a 25 and 250k linear device. I've found a 25k at DigiKey - GU2531526-ND but am stumped on the 250k front - anybody???

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.
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