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Author Topic: Heat Pump Install @ Courtiestown  (Read 18935 times)
linesrg
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« Reply #120 on: May 11, 2018, 01:18:23 PM »

Good Afternoon All,

That's me changing electricity suppliers again. Just shifted to Economy Energy (from Bulb) to save some 135 a year.

Regards

Richard
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16 x BP380 on a Lorentz tracker/ SMA SB2500, 16 x Chinese 80W/ SMA SB1700, 16 x BP380/ SMA SB1700. CTC GSi12 heat pump/ Gledhill ASL0085 300litre EHS/ 3off Navitron 4720AL solar ET panels and an Immersun T1060/ T1070/ T1090. 7 x Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery.
linesrg
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« Reply #121 on: May 14, 2018, 09:29:05 AM »

Good Morning All,

As a part of trying to get the Growatt working 'properly' I've been looking at my electricity consumption and trying to determine which device is giving me an 'accurate' indication.

I need to get back to SISEM as their suggested method of a 'hard reset' didn't work and they seem reluctant to have me start the unit too often! Their CT sensor over by the incoming meter is definitely 'out'. The Immersun has been set to only export 50W as the Growatt CT shows this to equate to circa 350W according to its CT sensor and I'm pretty confident of the Growatt sensor accuracy.

To keep this posting on track I'm sat here looking at the minim+ display and its telling me that my heat pump is using 400W. No problem you might say but it is supposed to be 'switched off'. The domestic CH function is off so the heating circulating pump is off, the ground loop circulating pump is off etc.etc. It isn't the Solar ET operation as there is no difference in indication when it starts up i.e. the minim+ shows 400W at 2300. This is costing me 1.46 a day if true.

I've sent an EM to CTC's Technical Manager to see if he can advise.

Does anybody on here have any observations or thoughts.

Regards

Richard
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16 x BP380 on a Lorentz tracker/ SMA SB2500, 16 x Chinese 80W/ SMA SB1700, 16 x BP380/ SMA SB1700. CTC GSi12 heat pump/ Gledhill ASL0085 300litre EHS/ 3off Navitron 4720AL solar ET panels and an Immersun T1060/ T1070/ T1090. 7 x Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery.
Tinbum
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« Reply #122 on: May 14, 2018, 10:15:07 AM »

I personally wouldn't trust the Growatt. Certainly I find the online data recording and the app have loads of bugs in them.

Last night I was looking at the display of export on the Growatt and what my sunny boy was showing and there was probably at least a 30% difference. I can't remember the figures exactly but it was notable.
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85no 58mm solar thermal tubes, 28.5Kw PV, 3 x Sunny Backup 5048, 3x Sunny Island 5048, 2795 Ah (135kWh) (c20) Rolls batteries 48v, Atmos wood gasification boiler, Brosley wood burner, 2000lt buffer tank and 250lt DHW
linesrg
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« Reply #123 on: May 14, 2018, 10:23:31 AM »

Tinbum,

I'm aware I'm dealing with something less then precision laboratory measuring equipment.

My baseline is that both Growatt CT's and the minim+ are aligned within 30W of one another which suggests a degree of accuracy and consistency.

I've just gone and dug out my Sealey MM405 clamp meter. It is showing 1.5A which at 245V gives me 367.5W which aligns well with the minim+ at 400W

The device that appears to be mis-aligned is the Immersun CT sensor.

Regards

Richard

« Last Edit: May 15, 2018, 03:19:35 PM by linesrg » Logged

16 x BP380 on a Lorentz tracker/ SMA SB2500, 16 x Chinese 80W/ SMA SB1700, 16 x BP380/ SMA SB1700. CTC GSi12 heat pump/ Gledhill ASL0085 300litre EHS/ 3off Navitron 4720AL solar ET panels and an Immersun T1060/ T1070/ T1090. 7 x Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery.
linesrg
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« Reply #124 on: May 15, 2018, 03:42:39 PM »

Good Afternoon All,

Phoned the heat pump installers yesterday afternoon in a mildly irritated mood that the Solar ET system 'air' issue still hasn't been attended to. It is work in progress.

Whilst I'll defend the 'benefits' of Solar ET I'm still wrestling with what to do about exported energy when it happens. Yesterday I saw 6.8kW exported and a week ago it was 6.7kW in one day but these figures aren't consistent. It's an average of around 3.3kW a day over the last 15 days for instance.

I'd like to charge the Zoe with this but I'm struggling to see how I can make this happen with the charge point I have installed.

I could limit the amount of energy from the Solar PV that goes to the EHS and allow the Solar ET to do more heating of said EHS but I need this system to be working 100% first. This would help alleviate the issue of excess heat developed by the Solar ET system so could be a win/ win situation.

Thoughts welcome as ever.

Regards

Richard
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16 x BP380 on a Lorentz tracker/ SMA SB2500, 16 x Chinese 80W/ SMA SB1700, 16 x BP380/ SMA SB1700. CTC GSi12 heat pump/ Gledhill ASL0085 300litre EHS/ 3off Navitron 4720AL solar ET panels and an Immersun T1060/ T1070/ T1090. 7 x Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery.
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