device to use unused soler pv export power to run heater or hot water

broke_mother_of_students

Please could you e-mail me details as well? Many thanks, in advance!

energysavingexp

broke_mother_of_students wrote: »

Please could you e-mail me details as well? Many thanks, in advance!

ive sent you it via pm

thenudeone

EricMears wrote: »

You could of course supply a 1kw immersion heater via a 230/115 stepdown transformer when it would only draw 250w (plus transformer losses).

very similar to what was discussed here
http://www.yougen.co.uk/blog-entry/1737/Auto+control+enables+use+of+solar+PV+for+immersion+heater/

energysavingexp

thenudeone wrote: »

very similar to what was discussed here
http://www.yougen.co.uk/blog-entry/1737/Auto+control+enables+use+of+solar+PV+for+immersion+heater/

yes thanks for that verry similar only it cannot tell if you are using leccy or not ie: if you turn on a kettle or dryer it will still think you are exporting my advice is buy it but fit the switch that looks at your meter to see if you are exporting or importing for an extra £5.99 this will stop you from importing leccy and save even more

Brian99_2

Kernel_Sanders wrote: »

Do these transformers come in 'piggy-back' plug-in form and if so, would they reduce a 2.2kW kettle's draw to 550W (+ transformer's demands)?

You need a BIG transformer, to handle say 750 watts.

They are heavy, and cost about £60 at Screwfix. (get the excellent free catalogue)

I have one, it works fine giving 110 volts to a 3 kW immersion, so I get about 750 watts of heating.

Only snag is it gets very hot, and wastes 30watts while its operating (when sun is high.)

EricMears

Brian99 wrote: »

You need a BIG transformer, to handle say 750 watts.

They are heavy, and cost about £60 at Screwfix. (get the excellent free catalogue)

I have one, it works fine giving 110 volts to a 3 kW immersion, so I get about 750 watts of heating.

Only snag is it gets very hot, and wastes 30watts while its operating (when sun is high.)

The screwfix transformer (& similar models avaiable elsewhere) have a peak rating around 3 KVA or a continuous rating of something like 1.5KVA - ample for a derated 3kw immersion heater drawing 750w. Secondhand ones via eBay are usually in the £20 - £30 bracket.

The things are relatively cheap because there's a big demand for using them to supply industrial power tools requiring a 115v CTE supply on sites where there's really only a 230v supply available.

Try specifying a similarly power-rated transformer for (say) 150v and you'd get a nasty shock (sorry about the accidental pun) and an even bigger one if you thought a variable output voltage would be even more useful.

'Wasting' 30w is no big deal when you're getting free power !

pwllbwdr

Hi. Could I please have the pm too? Thanks.

energysavingexp

pwllbwdr wrote: »

Hi. Could I please have the pm too? Thanks.

ok on its way

leboof

You must be sick of these, but I very be very grateful if you could send me the details please. Thank you in advance for your reply.

energysavingexp

leboof wrote: »

You must be sick of these, but I very be very grateful if you could send me the details please. Thank you in advance for your reply.

sent you it via pm