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Dan's 57kWh Build
#21
I read this the other day. It might be of interest, Wardy. Bear in mind though that he is in Canada and receives more sun than we enjoy here in the UK, and he has much shorter periods of over cast weather. He's also built himself a shoe box at just 65m2. However her does deal with temperatures far lower than the worst UK winter.

So... some things to think about and learn from, but he's certainly the exception to the rule. Few people could heat their home from solar, and even he needs to accept a very large internal temperature variation of about 8 degrees. My heating is controlled to within 1 degree, and I wouldn't want much more myself as just 1.5 degree difference is all it takes for me to go from feeling cold to too warm.

http://www.eevblog.com/forum/renewable-e...tural-gas/
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#22
(11-27-2018, 09:00 PM)w0067814 Wrote: I read this the other day. It might be of interest,  Wardy. Bear in mind though that he is in Canada and receives more sun than we enjoy here in the UK,  and he has much shorter periods of over cast weather. He's also built himself a shoe box at just 65m2. However her does deal with temperatures far lower than the worst UK winter.

So... some things to think about and learn from,  but he's certainly the exception to the rule. Few people could heat their home from solar,  and even he needs to accept a very large internal temperature variation of about 8 degrees. My heating is controlled to within 1 degree,  and I wouldn't want much more myself as just 1.5 degree difference is all it takes for me to go from feeling cold to too warm.

http://www.eevblog.com/forum/renewable-e...tural-gas/


Thanks for sending that link my way mate!. There are some great projects on there that are striving for the same goal as me. I'm still trying to work out which route to go down for heating and hot water, I really like the look of the sunamp heat batteries you showed me. I need to do some more research into them on how best to incorporate them. 
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#23
Bit of an update to the build. 
With a new born to add to the mix and working away from home a lot lately, progress has been slower than I would have liked but I've managed to get the storage box finished with a frame welded up with casters on the bottom so I can wheel it about easily during the build, also the shelf welded up to along with a few packs completed. 

 



I'm yet to drill the connecting holes for the M6 bolts in the busbars but there will be 1/4" / 6.3mm copper packers going between each one to separate them. Its going to be a snug fit in there, will be interesting to see if the packs generate much heat in there during use, if so I will have to add some vents to the box.
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#24
It might be worth putting some thin rubber mat or some other insulation under the pack, in the unlikely event they tip forward and short on the shelf.
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#25
(01-17-2019, 12:31 AM)Geek Wrote: It might be worth putting some thin rubber mat or some other insulation under the pack, in the unlikely event they tip forward and short on the shelf.

It’s a good idea from a safety stand point but I don’t think it would be very practical. The packs have got some weight to them and if there was rubber underneath it would be difficult to slide packs in and out. Once the build is complete and in service I will be fixing it to the wall so there will be no need to move it around anymore, I think it should be quite rigid to once all the bus bars are bolted together. I will put some plastic to the inside side faces as there will only be around 10mm gap each side when done and don’t want the busbars to touch the the box at all by accident.
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#26
(01-16-2019, 10:32 PM)Wardy Wrote: Bit of an update to the build. 
With a new born to add to the mix and working away from home a lot lately, progress has been slower than I would have liked but I've managed to get the storage box finished with a frame welded up with casters on the bottom so I can wheel it about easily during the build, also the shelf welded up to along with a few packs completed. 

 



I'm yet to drill the connecting holes for the M6 bolts in the busbars but there will be 1/4" / 6.3mm copper packers going between each one to separate them. Its going to be a snug fit in there, will be interesting to see if the packs generate much heat in there during use, if so I will have to add some vents to the box.

LOOOOOVING watching this come together. keep it up!
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#27
Very interesting thread.

I too have a goal of powering my home off-grid (in the city). I currently have an off-grid 7kwh PV array (24 panels), 40kwh DIY 18650 battery bank, and 12,000watt inverter (240v@50a) and in my area of Southern Oregon USA I generate 11-12megwatts per year. As mentioned a few times - Dec/Jan/Feb are significantly darker months (350kwh / month) compared to the other 9 (800 to 1200kwh / month).

At this level (12megawatts per year) I can run a lot of the house - and in an emergency, if we serialize power use (don't run cooktop and oven and dryer at the same time) we could have a pretty good life except for heating/cooling. As part of this I've been moving to compatible capabilities... for example I recently replaced my gas water heater with a hybrid heat pump water heater and its amazing that in heat pump only mode with the 2 of us it looks like maybe 150kwh / month for hot water and only draws 400watts max.
One could imagine in an emergency cutting that 150kwh/month down to 50kwh/month by carefully managing it sparingly to heat up once a week for hot showers.

I'm in a southern Oregon USA valley - which has mild winter temps in that it rarely gets below 4C/40F (mabye 2 weeks of year it can get down to -4C/25F). The 4C/40F seems to be in range for heat pumps - so I'm eyeing that when I replace my gas furnace.

I agree that double the current capability (14kwh PV array, 240v @ 100a, 22-24megawatts per year) would get me in range of powering the heat-pump for some portion of the year / day. E.g. Heat every day for part of the day would be better than no heat and/or some split heat pumps to heat/cool portions of the house would be better than nothing. We are looking at wood stove as backup heat source - as wood (in our heavily forested area) is a viable long term heat source.

However, I also agree from many of the comments that you need A LOT of panels for winter... in my case I would need to triple my current system (21kwh PV array = 72'ish panels with 36,000watts of inverter and 36megawatts of power per year) to actually get in range of powering the house in a 'more complete' way.

The current 24panels fit on roof no problem. Another 15-24 panels I can integrate into various features of the house such as the shed roof in back yard, rainwater harvest tank cover, gazebo, on top of fence, etc... but 72 panels would be eccentric for my city property. And then there's the cost. My current system is at a 22yr ROI and that doesn't include replacing the battery bank / equipment over those 22yrs.

BUT having said all those realistic things.. I absolutely love the idea of powering my entire home Smile and I applaud the author of this thread for the goal!!
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