Talking about elements and geysers
I have just finished off developing a system, in which you do not have to remove the geyser element. Connecting PV panels directly to any type of load with out an intelligent controller is extremely inefficient. PV panels are what we call constant current supplies, in other words, irrespective of the load draw, the panel will supply a constant current value.
An example, if we take a 250W PV panel, which at midday can give you 30V at 8.4Amps totaling 252Watts effectively, and you connect this directly to a flat 12V car battery, then the panel will supply 12V at 8.4A only, totaling 101Watts. You are losing 149Watts. An electronic device, known as an MPPT controller, will match the load to the panel, in other words the controller if designed for a 12V load, will convert the panel power to 12V at 21Amps. Far more power than the conventional method.
Replacing the element in the geyser to 750W 24-48V element will work with an MPPT, however, the currents at 24V and 48V are very high, causing the use of expensive very thick battery cables to ensure that there is no loss in the cables during full load, and also to ensure that the cables do not heat up with the high current. This makes the installation difficult and costly.
Here with my brochure.
Attachment 6113
It may not be cheaper than the vacuum tubes or direct solar heating systems at first glance, but installation of this unit is a couple of hours, and only requires the connection of a few electrical wires, as compared to the direct solar water heaters, which require modification of pipe work and additional plumbing, modification to roof, requirement of a heat exchanger with a specially designed geyser for the application, circulating pumps and controllers, and the additional weight on the roof of the circulating water and reservoir tank.
Ideally suited in the addition of alternative energy to an already built home using an electrical geyser.
Feel free to request distributors price list
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