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Author Topic: Solar thermal not circulating  (Read 7129 times)
Nickel2
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« Reply #135 on: July 03, 2019, 07:39:39 AM »

Purchase flow-marking tape and stick it all over everything for future reference?


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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).
Tinbum
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« Reply #136 on: July 03, 2019, 07:50:18 AM »

My question is.......A solar thermal system is Bidirectional.   The panels can be connected either way round, so can the coil in the tank, so why?Huh?? Huh??    stir stir

And I thought you had fitted loads of these. banghead
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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
Westie
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« Reply #137 on: July 03, 2019, 09:12:01 AM »

My question is.......A solar thermal system is Bidirectional.   The panels can be connected either way round, so can the coil in the tank, so why?Huh?? Huh??    stir stir

Haha...  good point.  He could have reversed the check valve or the pump.  Although, best practice is to install all the control stuff like pump, check valve, bleed etc.. on the cooler return to the collector.

I think we should award Chris a prize for perseverance - well done.  Actually maybe we should all have one  whistlie

 
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4kwp south facing array  SMA 4000TL grid connected.  2x30tube Navitron solar thermal panels (east/west). Arada 5kw S/C WBS. 25000Ltr underground rain water tank. KTM E-Bike  Cool
Westie
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« Reply #138 on: July 03, 2019, 09:16:03 AM »

Purchase flow-marking tape and stick it all over everything for future reference?




Maybe a simpler system is to always check that the arrow on the check valve and the arrow on the pump always point the same way  Grin
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4kwp south facing array  SMA 4000TL grid connected.  2x30tube Navitron solar thermal panels (east/west). Arada 5kw S/C WBS. 25000Ltr underground rain water tank. KTM E-Bike  Cool
stannn
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« Reply #139 on: July 03, 2019, 09:23:51 AM »

Can you buy tape with arrows pointing the other way?
Stan
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2.45 kWp PV (Navitron supply), 40 evacuated tubes (Navitron supply), Clearview 650 log burner with back-boiler heating cottage and water, 2 off 50W border collies, 1 off 35W cat, 1 off 25W cat.
Countrypaul
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« Reply #140 on: July 03, 2019, 09:51:36 AM »

Can you buy tape with arrows pointing the other way?
Stan

I bet its more expensive  hysteria
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biff
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« Reply #141 on: July 03, 2019, 11:55:35 AM »

 Grin I have rolls n rolls of it Stann.
  They are in the bottom side up box.
           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.
Nickel2
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« Reply #142 on: July 03, 2019, 04:27:38 PM »

They don't cost any more, you just open the box at the other end, or open it sideways as required:

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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).
chris wills
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« Reply #143 on: July 03, 2019, 10:11:53 PM »

OH Noooooooooo

Today roof temperature got really hot, about 135 degrees and for some reason its now affected the flow again.
Could it be that I need to replace the water with glycol?

I jumper up on the roof and bled again, just in case but water shot out.

I have again in the system stagnated water, why the heck has this happened?

Is it a setting on the controller maybe?

For the last few days I have been having lots of hot water
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rogeriko
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« Reply #144 on: July 03, 2019, 10:32:39 PM »

Whats the upper temperature setting on the controller, how hot is the max temp on the water tank sensor. If it is set low it will turn off the pump when it reaches that temp.
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rogeriko
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« Reply #145 on: July 03, 2019, 10:40:33 PM »

Glycol properties

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chris wills
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« Reply #146 on: July 03, 2019, 11:29:56 PM »

Whats the upper temperature setting on the controller, how hot is the max temp on the water tank sensor. If it is set low it will turn off the pump when it reaches that temp.

Just checked.
Collector temp was set to 140, I have upped it to 160 degrees C.
Tank temp was 60 so changed to 65 degrees C

This maybe the issue as the tank was filling up at 59, may have tipped over the 60 mark at some point.
Could be a drain and fill in the morning

lets see!

Edit update.
No joy. Roof is far too hot at 125 degrees. When it was working it was at 80.

Edit 2.
Drained down. Refilled. Now back to ok. Letís see what happens with new settings too

Edit 3
Changed solar cylinder Max to 90. Itís now 76 on roof. Tank has 70 in it. Result ok.
« Last Edit: July 04, 2019, 04:08:56 PM by chris wills » Logged
chris wills
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« Reply #147 on: July 18, 2019, 09:47:43 PM »

Just an update...........all good....... Cheesy

Next step...........add some glycol to complete
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pj
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« Reply #148 on: July 19, 2019, 12:41:01 PM »

My question is.......A solar thermal system is Bidirectional.   The panels can be connected either way round, so can the coil in the tank, so why?Huh?? Huh??    stir stir
The manifold on my system only has a pocket for the temperature sensor on one end, so although it could be plumbed either way, it only works properly if the flow is in the correct direction.
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