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Discuss Immersion Heater - PV electricity in the Central Heating Systems area at ElectriciansForums.net

A kit is good. A kit with explanation and discussion even better!
IMHO offering a kits with explanations support an open development so long as copyright is not claimed. Others can then learn from the kit.
Better still sell the AC side properly built and boxed, that would leave others able to develop the digital side.
I would be keen for example on a AC proportional control module rated to 3KW and accepting, say, 0 to 5V demand with the demand appropriately buffered and isolated within the module.
On practical level I find it hard to see where a company would find the ROI to support development, testing and qualification as there are
either patents preventing us and/or our discussions have now limited the field for new patents (well done all!).
Commerialisation would be hard as we are after all talking about a very simple design, one that would be easy to copy,
easy to add new feature and then claim as original design. Those pursuing the commercial route would need a patent or some magic other
device property (cost, features, company reputation etc.) in order to head off alternatives. The fact that several here have developed
their own system would tend to make this case. At a certain market size some of those playing catch up will have surface mount and will therefore trash all for cost and reliability whilst also having a company name which can be trusted.

There was some earlier discussion on patents.
The Emma patent LOAD MANAGEMENT CONTROLLER - Cooper, Timothy Patrick would seem to cover all the devices which we have discussed. Perhaps
I am wrong, I would be grateful for a second reading and some discussion. If I am wrong and there was a gap in the patent
then have we now prevented new patents through our discussion?
Personally I find it quite hard to accept the Emma patent. I am sure that I have read about similar home energy management systems in the past. I have in the past designed control systems which monitor supply and control output currents to match available power (DC only). Where is the intellectual effort/novelty in saying finite input requires managed output control?
Sunny Boy's home manager SUNNY HOME MANAGER.*SMA Solar Technology AG capabilities would seem to overlap the Emma patent, wonder what that's all about.
To open the field to both competing commercial and, to a lesser extent, free open collaboration then we should post any references to articles which
pre-date and therefore may invalidate the Emma patent.
In my view the Emma patent is simply too far reaching and may stifle the development of energy saving devices, whilst only providing an expensive solution.
That cannot be good for the planet.

If Emma were innovative to say £200 or so (the bits cannot cost more than £50 in volume) then I would be more inclined to believe some effort which justified protection and commercial return.
 
Last edited by a moderator:
Hi
I have obtained the pdf versions of the EMMA patent. If any body wants a read send me a private message with an email and I will forward it on. Tell me what you think. I personally dont want to get into any thing on the legal battle side as I cant aford to go head to head via laywers. :-(
 
Hi
Tell me what you think. I personally dont want to get into any thing on the legal battle side as I cant aford to go head to head via laywers. :-(
I don't think we need to worry about lawyers right now.
Noone is going to take a home hobbyist on. I brought up the EMMA patent to settle the confidential design/commerical debate.
I would be keen to see the patent disappear though.
I am pretty sure that power control similar to the EMMA has been discussed before the EMMA patent. I may be wrong.
If anyone finds an article published before the EMMA patent then post. Thats pretty much all we have to do.
If we find the evidence then we will open up competition to those who know how, competition giving rise to improvements, hopefully cost savings, more improvements etc, etc. Once the systems are reasonably priced we can all just buy one rather than risk a home fire (Mr EMMA thats a market gap hint).
I am especially miffed about the EMMA patent as I had the same idea round the same time but through a number of reasons (thought it had been discussed before, was told that meters ran backwards etc) and a medical condition (bone idle) left it alone. Secondly the EMMA cost is really high.
I think that SB home system overlaps the EMMA patent which if so is interesting. SB seem switched on and seem to have a green home game plan. They have had digital interfaces in their inverters (bluetooth now) for a while. I think that may reveal a plan which may predate EMMA. Hoping anyway.
 
I don't think we need to worry about lawyers right now.
Noone is going to take a home hobbyist on. I brought up the EMMA patent to settle the confidential design/commerical debate.
I would be keen to see the patent disappear though.
I am pretty sure that power control similar to the EMMA has been discussed before the EMMA patent. I may be wrong.
If anyone finds an article published before the EMMA patent then post. Thats pretty much all we have to do.
If we find the evidence then we will open up competition to those who know how, competition giving rise to improvements, hopefully cost savings, more improvements etc, etc. Once the systems are reasonably priced we can all just buy one rather than risk a home fire (Mr EMMA thats a market gap hint).
I am especially miffed about the EMMA patent as I had the same idea round the same time but through a number of reasons (thought it had been discussed before, was told that meters ran backwards etc) and a medical condition (bone idle) left it alone. Secondly the EMMA cost is really high.
I think that SB home system overlaps the EMMA patent which if so is interesting. SB seem switched on and seem to have a green home game plan. They have had digital interfaces in their inverters (bluetooth now) for a while. I think that may reveal a plan which may predate EMMA. Hoping anyway.



The EMMA people did a mailer via LinkedIn contatcs a few months back. I first contacted them last year so they must have picked it up from that. When I spoke to them this time, they said Mk II version is due out soon - I thinkk they said this summer but don't quote me on that - and it addressed the high cost issue.

Still waiting. I am absolutely convinced this is the thing to do with spare power but only at a reasonable cost. i.e. hundreds, not thousands. Will be very interested to see what SMA quote for their new peice of kit
 
Actually, it really is just that despite the talk on the thread. EMMA is a switching device that allows PV surplus power to be directed to an immersion. Alternative devices are scarce and knowledge of them would be welcomed by all looking at this thread.
 
Hi TonyL,
Not sure that I understand your post.
Are you saying that you originally had the idea for dumping spare PV power into heating?
Did you communicate via email?
The cost should be low hundreds. There is nothing complicated in this design, all the technology (as I would do it) is well established, its just a small control system really.
The component costs would be well under £100. The rest goes on development, marketing etc. A system could easily be developed & qualified in under 3 or 4 months, say £50,000 development cost. Plan to sell 500 so add another £100 to recover development. Add another £50 for support manuals etc. I just don't see the price tag.
Unfortunately the SMA system seems likely to cost £1000 or so.
Again I don't see where the costs come from but the system may be better featured.
 
The EMMA people did a mailer via LinkedIn contatcs a few months back. I first contacted them last year so they must have picked it up from that. When I spoke to them this time, they said Mk II version is due out soon - I thinkk they said this summer but don't quote me on that - and it addressed the high cost issue.

...... at a reasonable cost. i.e. hundreds, not thousands.

Far as I can tell they are promising a new range called Cascade in Sept but it is for large installations so not addresing the cost issue for you and I. My unit is less than hundreds.

The SMA kit will only switch loads on an off so does not do close load matching.
 
Noone is going to take a home hobbyist on.
Not only because it wouldn't be worth it but because there would be no legal grounds to do so. However, if anyone is using intellectual property covered by the patent to make money, they may well do, and I presume that is one reason why people here selling kits or complete units are being cagey about what their systems consist of.

As for home fires, well of course there is a risk, but if you are competent at electronics the risk is very small: if the relay sticks closed or the triac fails short circuit, it will merely supply full power to the immersion heater, which will switch itself off with its existing thermostat.
 

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