S&G Wooldridge Ltd

Solar PV  heating controller.

Use with existing immersion heater or any other purely resistive convection heater ( not fan heaters, motors timers etc).

No need to change the immersion heater.

Uses every last  fractional KWatt to dump excess generated Solar PV power into the load.

Unlike other systems this will constantly monitor for any excess power generated over consumed power.

You will not spend a single penny unecesarily on water heating again with this system! ( assumes of course your solar array is adequately sized)

Other systems merely monitor when PV power is generated wait for an excess of say 1kW then switch on the heater.

Such systems A/ waste that first KW and B/ don't take into account other energy consumed in the premises. eg washing machines , microwaves, ovens, freezers. which mean you can be paying after all for water heating under import tariffs

It can easily be shown that such systems extract less than half the available potential power compared to our unit.

Our Solar PV heating switch patiently waits for these consuming units to reduce consumption below generated power, and switches all available surplus power to the load or loads.

Can drive multiple loads so even when water is up to temperature  and the thermostat switches off, the excess power can be used as background heating. * May need auxiliary modules depending on function required.

This Solar PV controller therefore can use every last unit of excess power generated.

Is it legal? Yes

Is it ethical? Yes, solar power thus used merely displaces alternative higher cost energy  for water and heating.

Is it environmentally sound? Yes Using generated power at source saves energy distribution losses which would otherwise heat the environment . (Applies to both the exported energy and imported alternative heating energy eg oil, gas etc)

 Now in full production. UK design and manufacture.

Solar PV Controller type SPVHC/1  4Kwatt rated    £395 plus 20% VAT

recorded delivery £10

Should easily pay for itself within two years especially if used for background heating and hot water.

The remainder of the 25 year life of your Solar PV and controller will give you free heat and power.

There are very few if any legal schemes to give a 50% ROI

Payment accepted by BACS or Paypal ( please add 4% for Paypal charges)

Note that you do not require a higher rating than your Solar PV peak power.

New video with three Controllers

The old video with just two Controllers

•  Accuracy better than 2% of fullscale. (Biased 50watts towards export.)
• Phase and Power factor correctly taken into account unlike most energy monitors.
• Accurate power monitor  mimics consumer meter circuitry, hence imports no unnecesary power.
• Tested in the field 11 months continuously.
• MTBF 27 years.
• All solid state switching.
• 3 year guarantee repair or replacement.