Adam H's posts

Posted by Adam H on Apr 27, 2013 06:32 pm

#1 -  Renewable Energy > Technical Discussion: Solar Heating - Solar Thermal > Re: Overheat protection: hot water cylinder / PV
Thanks! I was worried about the 'stat, wondered if that may happen (it reminded me of some of the trouble we get on car relays). Sounds like I should give the existing element a try which is great news. I will figure out a relay system. The way you describe sounds pretty straightforward, thanks for that. All the best, Adam.
 

Posted by Adam H on Apr 26, 2013 05:10 pm

#2 -  Renewable Energy > Technical Discussion: Solar Heating - Solar Thermal > Overheat protection: hot water cylinder / PV
Hi, first time caller Smiley

I have a neat 400l (~100 gal) HW cylinder. It currently has 2 X 3.6kw 240v ACĀ  elements, top and bottom. I have disconnected the bottom one.

I am thinking of trickle heating using a DC element in the bottom and about 400w of PV. (I have grid-tie PV elsewhere, but due to the way my utility buys back power I must always be a net consumer - so it's not worth me going full thermal)

My worry is the thermal cutout - the cylinder has all the usual safety gear, but I would like to be able to shut off the DC if the water hits, say, 70C.

It is fitted with a surface mount 'stat at the bottom, but this is rated at 10A 240vAC...

Any thoughts? Or just don't worry about it? (400w on 400l will take a lot of sunny days... I figure about 20 hours @ 100% efficiency)
 

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