> Hi all,
>
> We now have fitted a brand new solar panel to the roof of TIAMI. Looks
> very smart. We got rid of the decaying wooden box structure that
> housed the old panels. The new panel is a Solara 68 watt and even
> yesterday in the grey murkiness 3 contented little voles per hour were
> trickling their way into the batteries. We've also got a very clever
> regulator for the panel that acts as a battery management system. No
> more lifting the back boards to find out the condition of the
> batteries. It'll be interesting to see how quickly our battery
> condition improves. We've not the run engine for a bit and it was
> implying yesterday that our batteries were only at 50% of capacity. A
> worthwhile investment we think.
> Debbi
Interesting, because according to Solara's site there's no 68 watt model....
Solara's list used to show the SM225 as 68Wp, but now it's shown 56Wp. Some
web sites still show the old data. But the important data is not the peak
watts (as the sun is only at peak once per day!), but the total output which
is 225Wh/d - so every sunny day you should get the *equivalent* of 225 Watts
for an hour (why they can't put 810kJ is beyond me... 225 x 3600 - if
you're wondering : Watts x seconds = joules), so assuming that's going into
a battery at (let's say) 13V, then, in theory, you should gain 17.3AH each
day that we have full sun. So assuming you have 3 x 110AH batteries at 50%,
that will man you need 9.5 days to get to 100% (not allowing for any
usage(!) and losses). Let us know how long it actually takes...
Ron Jones
Process Safety & Development Specialist
Don't repeat history, see unreported near misses in chemical lab/plant
at http://www.crhf.org.uk
Only two things are certain: The universe and human stupidity; and I'm
not certain about the universe. ~ Albert Einstein
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