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Author Topic: Heat Pump Install @ Courtiestown  (Read 16494 times)
linesrg
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« Reply #105 on: March 03, 2018, 08:25:15 AM »

TT,

There is the only the one pair of terminals unfortunately. It would be nice if the installers would respond to my enquiries rather than rely on my chasing them up. OK so it may not be the most important issue they have on their plate at the moment as I'm sure the weather is causing them a measure of grief but a couple of minutes replying to an EM isn't too demanding.

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 #106 on: March 03, 2018, 10:28:08 AM »

Could it be a mouse has eaten into the cable and exposed the conductors which are then getting damp?
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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 #107 on: March 03, 2018, 12:42:59 PM »

Tinbum,

I had wondered about that. If I could work out exactly how the push fit terminals work (there's me honest enough to admit it!!) I'd take them out and put a meter on the two wires. It's a 150R NTC thermistor according to the manual.

Similarly if I could work out how to get the lid off the sensor housing outside without resorting to brute force and ignorance.............

It has dropped to 0 degrees overnight.

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 #108 on: March 08, 2018, 12:23:06 PM »

A combination of the Solar PV and Solar ET have heated the water in the EHS to the point where the system has switched the compressor off in the heat pump.

This allows the circa 1kW to be diverted to greater water heating and the the temperature of the EHS is rising despite heat being removed for house heating which has to be good news.

I've now set the Immersun to allow 1kW of export and the Growatt is now charging the battery.

Currently the best of all worlds??

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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« Reply #109 on: March 08, 2018, 12:34:45 PM »

Losing track of what you have in your rig now, but it all seems to be working well!
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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
linesrg
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« Reply #110 on: March 08, 2018, 08:59:03 PM »

Good Evening All,

That's 10hrs of 'free' heating today courtesy of Solar PV and Solar ET.

Mixed results with the Growatt - still trying to get a Windows based device to talk to it.

Getting a 'Bat T outrange' error message which relates to battery temperature being out of range, this is apparently settable (when I get access).

Having taken the front cover off the battery pack I can see that charging the batteries the other side of the BMS is easy enough as the two cables to the battery pack are screw fitted to the PCB.

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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« Reply #111 on: March 09, 2018, 09:25:15 AM »


Getting a 'Bat T outrange' error message which relates to battery temperature being out of range, this is apparently settable (when I get access).


Yeah, i've had that when its been about -5 degrees, it will clear when it warms up.

I think its set to about 0 degrees as default, the manual for the growatt says operating range from 0 to 40 degrees.
But the data sheet for the lithium cells it uses shows it can charge down to -20 degrees so I changed the setting on mine to -10 degrees.

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10kW of PV.
20 kWh storage in lead acid batteries.
48 kWh storage in lithium batteries.
10 kWh storage in hot water.
16 kWh storage in storage heaters.
Water harvesting from underground river.
A few cold frames and raised beds.
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« Reply #112 on: March 21, 2018, 08:55:11 AM »

Good Morning All,

I was just on the EST site and I see they are endorsing Endotherm. Does anybody have any direct experience of this product?

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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« Reply #113 on: March 22, 2018, 11:01:27 AM »

Good Morning All,

I'm going to be contacting CTC's Technical Manager shortly querying the current logic of the heat pump software.

I had a shower yesterday evening and when I came down I noted the system was heating the DHW. The software noted that the EHS was at 37 degrees C and as the lower temperature in the DHW tank was only 32 degrees C it decided to use some of the heat from the EHS to heat the DHW. On paper this seems logical i.e. extracting 100% of the energy from the EHS.

At the same time as the DHW is heated from the EHS the heat pump switches off. As you can imagine it doesn't take very long to pull down the temperature in the EHS and there is always a 9 minute start up delay on the compressor in the heat pump.

It doesn't seem to make any sense to stop the compressor to extract such a small amount of energy from the EHS?

On a positive front that's the Solar PV and Solar ET heating the EHS and the heat pump compressor is off.
 
Hopefully if the sun continues shining I might see the Growatt battery doing some charging today  Undecided

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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« Reply #114 on: March 23, 2018, 02:24:25 PM »

Good Afternoon All,

We had quite a good day yesterday up here in Aberdeenshire with some 20.7kW of Solar PV along with circa 10kW of Solar ET. According to the Immersun some 10.9kW of Solar PV was diverted to the EHS.

The EHS was heated from around 35degrees C in the morning with the heat pump compressor cutting out around 1100 and the central heating was supplied from the EHS up until beyond 1930 when I went out so we would have had at least 9hrs 'free' central heating yesterday.

The thermostats on the immersions in the EHS are set to around 70degrees C so in the late afternoon the Immersun directed the excess power to the grid. Unfortunately the sky was filling with cloud so although the Growatt did start 'charging' broadly speaking there was less than 100W from the PV string it had access to.

Part of the point of this post relates to the near equal contribution of energy to the EHS from both the Solar ET and Solar PV. As commented elsewhere on the forum the Solar ET had a much smaller 'footprint' than the Solar PV for near equal energy outputs.

Regards

Richard
« Last Edit: March 26, 2018, 07:33:18 AM 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 #115 on: April 06, 2018, 12:16:25 AM »

Good Morning All,

A record day for PV production here with 27.1kW (9.9kW of which diverted to the EHS) according to the Immersun with approximately 4.3kW of that coming from the extra 1.675kW of panels. The Solar ET side produced circa 16kW of energy into the EHS. I'm not sure for how many hours the heat pump compressor was off during the day as I have been out.

Still experiencing problems with the Growatt as despite 7.5kW of power being exported it all seems to have bypassed the Growatt! I'm going to have another look at the system today although the next forecast sunny day will be Saturday. At least I now seem to be able to get a laptop to communicate with it.

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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« Reply #116 on: April 06, 2018, 11:29:00 AM »

Hi Richard

Then that is strange. All my SP2000's had at least 88% full batteries yesterday and they are set to do Forced Discharge too

What has totally confused me though is my Owl Monitor (saying I'm importing 6.5 amps) compared to my Apollo Gem (diverter) saying I'm importing 0amps and the SP2000's saying I'm importing 0amps! I have another Owl, so I'm going to install that and see what it reads
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linesrg
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« Reply #117 on: April 15, 2018, 11:48:35 AM »

Good Morning All,

Well it is a year now since I started logging assorted data about the heat pump, Solar PV & Solar ET.

My predicted annual usage of electricity was some 12.3MW but the actual figure has turned out to be only 11MW, this could probably have been improved on as we lost the full benefit of any input from the Solar ET from mid-July through to mid-October as previously reported.

The heat pump compressor was off for 13hrs yesterday and the Solar PV made 20.1kW with 9.3kW diverted to the EHS, Iím not sure what the Solar ET input was.

Regards

Richard
« Last Edit: April 15, 2018, 02:51:08 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.
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