Noting the bbc news article . . .
According to a recent report from the UN Environment Programme, sea level is rising in the Pacific around the Marshall's at a much higher rate than elsewhere in the world. The rate of rise between 1993 and 2009 was 12mm per year, compared with the global average of 3.2mm.
The increase at this latitude is likely to be less than the average due to centrifugal force 'throwing' the sea out at the equator more. However there is island tilt due to isostatic rebound. The release of weight from more northern parts of the UK means the southern coast is sinking, that is the earth's crust at this point will sink a little into the mantle.
This has been calculated for Essex at approx 6mm/y, nearly double the global average.
At such a rate the high-tide boundary would be some 6cm (4¾") higher than when we bought the land.
Note that the general rise in sea-level is due to thermal expansion not to the volume of ice melting.
Fri 7th I connected one panel, via the Steca Controller, to one old battery. Used it as load battery and measure a use of 10Ah total.
Could see from the Steca the Asus 900 uses 1 amp
Sat 8th Since then I have 2 old 50w panels connected via the Steca to one old battery. The other old battery I have topped up with water, which was a bit iffy as it was a sealed battery. The six cells needed about a litre so hardly surprising it/they were almost unrechargeable.
That battery as end of day on the 9th was rated as 52% charged, by the next morning is was 48%
I have ended up buying two hydrometers. I first called Plymouth Battery Centre who informed me they had a glass model at £19 which I thought was a bit expensive so when I went to town I thought I'd look around before I took the mile or more walk to Prince Rock.
The Toolshed could get a glass model for £5 and the car shop next door had the same model for £2.99, which I bought. When I went to the Plymouth Battery Centre to buy some red and black covered multi-core cable I decided to buy the hydrometer they had anyway, which cost £14.50 eventually.
The better model from Plymouth battery Centre is the one on the left, although you cannot see the coloured scale. It is supplied by Gordon Equipments under the name DURITE model 0-070-00 ; range 1.15 to 1.40; accuracy 0.01. All parts are individually replaceable.
Concerns regarding the cheapo
- The float diameter is much smaller than the container diameter so the readings are at an angle.
- On the side of the container the float rests, the surface tension of the acid draws the liquid further up the side of both, giving a distorted view.
- The scale is on the small side so not so easy to read.
- And of course there's the idea that the calibration is off.