This query is for a college project. The Source can give 0.3 V to 0.8 V. Need to boost the voltage to 12 V, so 6 x NiCd batteries can be charged through LM317 CC charger. The converters available are from Pololu.
- Can the boost converter be used in series as shown?
- If not can somebody suggest an alternative?
Sorry for the confusion I have created. First time I have used the forum, and it is learning time. Now I will put the project in details and you people help me out to take it to the logical end.
The Energy source for the TEG is pure sunlight, and there are eight TEG’s in series. This TEG Hot Side are mounted on to an Aluminum Plate 3mm thick (300mm x 140mm). The Cold side is also fixed to an aluminum sheet (120mm x 85mm x 3mm) and also two heat sinks are used to help in the cooling. I have used Thermal paste in between all mating points. There are no other energy source and the idea is to harvest the sun energy and charge 6 * Ni –Cd Batteries (1.2v, 2500mAH), which in turn drives an Arduino and two servo Motor. Also The Hot side plate is enclosed in an Acrylic (plexi) Box, to enhance the temperature of the plate. (Green House Idea). The sides of the box are fixed with reflectors. (Will attach photos for clarity) The cold side is outside the box. (At ambient temperature)
The Setup sits on a dual axis tracker, so that the hot side plate is always perpendicular to the sun.
I have not measured the temperature on the heat sinks as of now (no access to the measuring instrument). I am planning to fix the Dallas DS18B20 on both the hot side and cold side to take reading using Arduino.
The voltage I am getting is approx 800mV from the series connected 8 no’s TEG. (Also I have a same setup where I have used TEC 12706, 8 no’s in series and I am getting approx 700mV).
The specification of the TEG & TEC is way higher from what I am getting. The temperature difference I am assuming might be around 15 – 20 C. will check ASAP and update. Can you people guide me, if I am doing something wrong?