[Stoves] Thermoelectric device for biomass stove

Wed Jan 9 11:03:59 CST 2019

Dear Tony and all

Just to allay come fears, the efficiency of a buck-boost voltage regulator is very high. They have a current limitation: for example I have two, one is 200 ma and the other is 1 amp. Adding cells won't help the power go above the set voltage at the max current of the device.

I suggest however that a reliable 200 ma at a wide range of stove power has its advantages. Adding a couple more TEGs for $2 will ensure the lower temperature condition will still generate the max output of the booster.

I have a most useful device which is a USB power meter. It is very small and goes between the source and the thing charged. It displays in rotation the voltage then the current in ma for about  seconds each. Obviously it uses some power itself, however it is very helpful for knowing what a port is delivering.

Regards
Crispin

www.newdawnengineering.com

From: vovers1 at gmail.com
Sent: January 9, 2019 11:50 AM
To: stoves at lists.bioenergylists.org
Reply to: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] Thermoelectric device for biomass stove

Shivam it is simply not enough energy
You are only producing 0.9w of power (3Vx0.3A) bucking up to 5V means only 0.18amp is available - not counting any conversion efficiencies, not enough to do very much.
I suggest you get a small Clamp multimeter so you can see both volatge and current.
You will need to wire up multiple TEG to get usable power - most phones need at minimum 1 amp @ 5V to charge - just check the charger that comes with the phone.
You would need to put 6 of your TEG together to get usable energy. I suggest you should wire 3 in series to get about 6V output - with 2 sets of 3 in paralllel.

Hope this helps.

Tony Vovers
+62 (813) 3888 9062 (HP)

On Wed, Jan 9, 2019 at 11:41 PM Shivam Patange <shivam.patange6o at gmail.com<mailto:shivam.patange6o at gmail.com>> wrote:
Respected sir/ma'am,

We're using high temperature thermoelectric module to utilize waste heat of flue gases (coming from stove) and convert it into electricity. Currently, we're able to get 3 to 3.5 volts open circuit voltage and 0.3 Amps current. We've connected a DC-DC converter where this voltage is regulated to 5 volts. There is an USB port at the output of the converter where phone can be connected for charging. We've tried different smart phones but none of them is getting charged.

I'd like to have your opinion on this.

Thank and regards,
Shivam Patange

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