If you are on grid you can use one of these to direct your surplus energy to your hot water tank rather than export it.  In most cases this won’t affect what you get paid for export as most small on grid systems get paid on an estimated 50% export rate and aren’t metered on the export.  This means you get to use all your power and still get paid the same as before!

SOLiC 200
The SOLiC 200 automatically converts energy generated by your existing PV panels into hot water by intelligently diverting unused power to the immersion heater before it’s exported to the national grid. Simple to use and maintenance free, the SOLiC 200 is self contained, easy to install and can save you hundreds of pounds over the course of a year.

The SOLiC 200 has a 10-year return-to-base replacement guarantee and has been designed, constructed and fully tested in Britain to the highest CE standards for a 25-year lifespan. The unit can be installed quickly and easily by a qualified electrician—typically in under one hour—without the need for plumbing alterations.

• Provides hot water from existing solar PV panels
• Saves hundreds of pounds annually on your energy bills
• Returns on investment in less than three years
• Includes 10-year return-to-base replacement guarantee
• Operates with a zero threshold export to the grid
• Reduces your CO2 emissions
• Requires no plumbing alterations
• Works even on cloudy days
• Installs quickly and easily
• Complies with CE and British Standards
• Engineered to last 25 years
• Keeps indoor frost away when heating is off
• Provides hot water in remote locations
• Incorporates built-in overheating protection
• Provides hot water instantly on return home from holiday
• Works independently of solar installation
• Uses compact and robust aluminium construction to prevent corrosion
• Prevents ingress of insects and dust as unit is fully sealed when correctly fitted

Operation voltage: 230VAC mains single phase 50Hz
Mains voltage: 205 – 260VAC
Power consumption: 0.025W (at 230VAC)
Active current: 0.005A
Transfer efficiency: 99.6% (at max power)
Max load current surge: 600A for 10ms
Continuous load current: 13A
Mains frequency tolerance at 50Hz: nominally 2Hz
Operating temperature: 0 to 60C
Storage temperature: –20 to +75C
Operating and storage humidity: 10 to 90%, non condensing
Max impact force: 12G
Lightning and ESD protection: to 1.8kV
Current tracking accuracy: better than 90%
Export threshold: 0W
Audible noise emissions: below 10dBA
RFI (EMC) emissions: below -52dBW
Max power dissipation at 3kW output: 12W
Internal fuse: 250V 500mA 20mm slow blow
Insulation resistance: above 10M Ohms
Case isolation protection: better than 2.0kV
Case dimensions: 161 x 105 x 57mm
Total mass as supplied: 625g