[Stoves] Solar Cooking facilities for all rural households in India

Tue Jul 10 20:30:09 CDT 2018

Small contribution Andrew:

48 VDC is much better for control electronics, as you say, and all bicycles are 48 Volts, that I have looked at. It seems the electric vehicle industry is settling on that because it is regulated less stringently.

I don't know how many of you have any electronics training but "when I was young" any Class C circuit was permitted without safety because it was incapable of blowing anything up, even itself. A short circuit caused nothing untoward.  Heaven knows what they call that now but the principle still applies. 

If 48 is safe to touch and the parts are 1/4 the size, why would anyone go for 12 volt anything? What voltage is produced under a nominal load from 20 Li-ion batteries?

The CAU students and I looked at induction cookers to see what they delivered. First, they deliver less than the claimed efficiency, closer to 75% than the claimed A, B, C ratings (respectively 88, 90, 92%). Second the power rating is the consumption, not the cooking power.

Cooking at high power would still draw at least 30 amps, 40 from a big unit (2 kW), from a 48 volt pack. Would it be better to store heat?

Regards
Crispin

-----Original Message-----
From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Andrew Heggie
Sent: Tuesday, July 10, 2018 12:18 PM
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Solar Cooking facilities for all rural households in India

On Tue, 10 Jul 2018 at 10:24, Michael N Trevor <mntrevor at gmail.com> wrote:
>
> WANT TO KNOW A WHOLE LOT MORE.
> GOOGLED 12 v INDUCTION COOKTOPS
> SOME VERY NICE EXPENSIVE STUFF.
> BIGGEST THING LOTS OF FANCY ELECTRONICS THAT WILL NOT HOLD UP IN RURAL 
> WARM COASTAL MARINE CONDITIONS

All the time the aggregated cost of the PV panels and battery storage are so high I cannot see solar to electric induction being viable.
Currently  any battery storage I can buy is a couple of times more expensive than buying from the grid in UK so it doesn't pay me but it may pay me to heat water from excess PV electricity. Just as PV panels have halved in price as production capacity has increased it looks like LIon batteries are coming down by ~15%  as installed capacity doubles, whether there is enough lithium  mined to sustain this is another matter and there are other storage technologies.

Michael what is the common failure mode of fancy electronics in your environment?

The circuits for induction heaters seem remarkably simple, a couple of MOSFETS  in push pull oscillating at ~150kHz  and a simple control circuit (the one I bought following Nikhil's promulgation is too coarse on the control side) but I see no reason to store or distribute even DC electricity at such a low voltage, 48V seems more sensible and then the MOSFETS handle less current.

Andrew

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