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Renewable energy updats

Harrow.

Half a kilowatt and it's only 1000.
Around half the consumption is from solar at present. Several days everything runs on the solar supply, with loads being shed after indifferent days to allow the surplus on days like this to bring the battery charge up again.

Generally the cue to return fully to solar is when the log from the controller for the days shows significant time spent in "Absorb" mode, as this the the mode where the last 20 per cent or so of the possible charge is being stored.


Bermondsey
All commissioned, and Monday was reported as producing 5KW at 1000. The system is unusual in having panels horizontal. This is not my choice, but it did keep everything invisible from ground level and allowed things to go obtain planning and listed building consent. The power loss from a flat mounting is offset to some degree by being able to fit more panels into the available space. This gives a payback in poor sun conditions where there is more light coming vertically from scattering in clouds, and there is a greater area of silicon to capture it.

Under poor overcast systems a kilowatt of power has often bee recorded.
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The big system

Commissioning over the weekend was successful - Array wiring all proved out Saturday, tested to the input plugs to go in the inverter, then one link disconnected each array section to leave it in a safe condition as there was a chance there would be work done on sunday adding the remaining ballast blocks.

Returned late Sunday afternoon, restored the links, rechecked the array volatage and polarity, set the inverter to G83 and English and connected everything up.

Self test was successful. System fully commissioned Monday and registered. It wrung 11 KWh out of indifferent sun on Monday and 22 KWh today. At mid day the building was exporting power.

A pleasing conclusion to five weeks work.
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Nearly there

Panel frame being levelled
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Trial panel fitted to check fixing methods
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Frame now all level and ready for panels
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Panels installed ready for connection.
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Inverter room with wiring nearly completed
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Inverter room all complete
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2.4 Kilowatt hours harvested today
Yesterday a peak current of 26 amps when the sun came out at mid day.

The cold snap is proving a good time for winter solar electricity, with good harvest of over 2 Kilowatt hours on several days during the last fortnight
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The big system

Orders just placed for cables switchgear and meter for a 10 KW 3 phase grid connected system.

reviewing quotes for inverts and PV modules.

Doing lots of calculations for roof loadings, wind forces and playing e-mail tennis with structural engineer
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Maintenance day

Very little required.

however, mid day current of only 17 amps seemed rather low for a summer day, and inspection showed a number of cell shaded by the brambles. Once the secateurs had done there work a current of 21 amps was recorded.

Cooking lunch with the steamer produced a peak current of 25 amps out of the charge controller, which dropped back to around 21 amps or so. For the first time in around 2 weeks the batteries have had a period of "Absorption" charging rather than "Bulk".

I also nailed an annoying RF interference issue spoiling my enjoyment of radio three. The link from the DC negative to earth has been re-made and the inverter negative cable dressed clear of the actual inverter - it seemed to be prone to picking up interference from the innards of the inverter and forming some sort of feedback loop.