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Solar PV (maybe with wind too) in London, UK | 12 comments (12 topical, 0 editorial)

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#5)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Mon Jun 25th, 2007 at 09:03:02 AM MST
(User Info)

Damon;
Very nice read on your system. I like the thought process that went into deciding what this system is for and what your current and long term plans are. Knowing this isn't cheap and the pay-back is indeed long term, if ever, is a very good thing to understand.
Perhaps Ghurd will chime in here soon about his dump controller. It would be a very good addition to both your current setup and future additions, since it is independant of what type of controller you're using. It could also help make use of the extra power during the summer months to charge a seperate battery system.
Not that I'm pluggin his not for sale yet stuff ----- but I know the flexablity of it and how easy it is to add to an existing system--- plus I'm gently pushing him to tell more.

Perhaps as you go further into the design you could "zone" the system. Meaning the 40SLA for lighting and a different one for the DSL and WIFI systems.

I am curious about the always on needs though. Since both DSL and WiFi can be turned off during non-usage without fear of losing settings. This would help lower the overall power needs.

& WELCOME!! to the forum.

Cheers
Bruce S

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#6)
by DamonHD (d@hd.org) on Mon Jun 25th, 2007 at 09:57:01 AM MST
(User Info) http://www.earth.org.uk/

Hi,

Glad you like the write up, and thanks for your kind words!

A few points in no particular order.

My current solar controller doesn't use a dump load (ie it's not a shunt regulator), which saves a bit of heat generation and is fine for solar. I know that almost any non-trivial wind gen I add will need a shunt/dump regulator, but I'm really going to need someone to construct a low-power small turbine for me since my DIY skills are minimal! Anyway, no hurry, since I'll only probably benefit from wind power in winter.
I am thinking of maxing out around the current controller to ~90W of solar panels, to have a chance of gathering enough power for decent lighting overnight, and to be able to have a chance to run some of the other kit, during even a fairly dull winter's day, and then probably bumping up the battery capacity to (say) ~200Ah to get one day's lighting-and-the-rest power at 50% discharge.
Beyond that I am definitely thinking of getting a separate set of kit for the higher-power loads, possibly even running at 24V to reduce current levels a little. But if that was really going to run all the non-lighting kit all the time I'd need >500W of PV and >800Ah@12V (400Ah@24V) of battery for a few days' capacity and to avoid deep cycling. If we get a loft extension done that we're thinking of then that's maybe were I could accommodate the panels since otherwise we'd have to cover half our tiny garden!

Rgds

Damon

[ Parent ]

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#7)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Mon Jun 25th, 2007 at 11:33:24 AM MST
(User Info)

Damon;
You might want to contact fungus and claude. I believe they and a a few others are close " in relative terms":-) to you and would probably enjoy the gathering of minds.
Claude seems to be a wiz with visual things and so far and done a great jobs of "stuffing" many things into a small area and fungus already has some windies up on their place.

Just as a curoius question? which *nix are you using?

Cheers
Bruce S

[ Parent ]

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#8)
by DamonHD (d@hd.org) on Mon Jun 25th, 2007 at 12:33:32 PM MST
(User Info) http://www.earth.org.uk/

For the new laptop? The guy I'm buying it from (Adam of Xephi.co.uk) is still experimenting for me, but I think we'll probably end up with Ubuntu (ie a 'Debian' Linux). It's important to have an up-to-date version of Linux with the 'laptop-tools' with lots of power-saving measures.

I'm aiming to boot the machine and run it most of the time off a memory card so that I need not even spin up the hard disc very often... And the screen will be off. And unless the sun is shining I'll do only the minimum processing necessary...

I'll get this all working as well as I can on mains power before lashing out on extra PV and batteries, since every W saved may knock the equivalent of as much as USD100 off the final PV system cost...

(Currently I use all Solaris at home, on third-hand machines, some 10Y+ old, and a mixture of Solaris and Linux hosted elsewhere in the world.)

Rgds

Damon

[ Parent ]

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#12)
by DamonHD (d@hd.org) on Wed Jul 11th, 2007 at 02:46:58 PM MST
(User Info) http://www.earth.org.uk/

Hi,

Laptop is up and running and was briefly powered from the solar-charged battery this evening and was drawing ~21W from the battery running something near a real load (ie not completely idle), which is very respectable I think. (My aim is to get to 20W or below unless there's lots of extra power available.)

I have an Ubuntu "Feity Fawn" release with laptop-mode and cpufreqd, with the kernel upgraded to the latest-available Gutsy version, which gets me the tickless clock and a few other power-saving features.

I'm keeping an eye on what might be wasting power with PowerTop.

(I'm not posting a link since my ISP managed to drop my DSL connection today, and it'll be tomorrow before it's fixed.)

Rgds

Damon

[ Parent ]

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#9)
by ghurd on Tue Jun 26th, 2007 at 09:12:41 AM MST
(User Info)

Bruce et al interested in the controller,
The "free meter" morons screwed up. Again. 84% of the order this time. They do that a lot. Then they charge S&H, again. Lesson learned.
Then 8AM, the FedEx truck hit the brakes hard, then kept going. It's 11AM, so much for the 10:30 thing.
And that "work" thing is becoming a major inconvenience.

The controller is designed for people in just this situation. Cheap and simple too.

Claude is in Romania. It's not near anything!

Damon,
A solar controller and a dump controller can be used on the same battery.

G-

[ Parent ]

Re: Solar PV (maybe with wind too) in London, UK (3.00 / 0) (#10)
by DamonHD (d@hd.org) on Wed Jun 27th, 2007 at 01:01:50 AM MST
(User Info) http://www.earth.org.uk/

Thanks for the confirmation about the using two controllers to charge one battery!

Rgds

Damon

[ Parent ]

Solar PV (maybe with wind too) in London, UK | 12 comments (12 topical, 0 editorial)

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