I will be driving the van strait after every job/battery use back home or
to another job, so the split charger system will really pretty much do the
job that the solar panel would do. when at home I will be connected to a
mains charger.
The problem I have at the moment is that I am still doing my old job, until
I sort out things and I am only driving for about 45 minutes each way every
day. I also have not yet fitted the mains charging socket on the van. I
really don't like the normal mains connection sockets here in the UK, as it
needs a large hole on the van. I looked around for a bit and found some
water proof socket/plug that are quite small , all be it limited on current
capability, that I am planning to fit. Been a bit busy fitting the workshop
in the back of the van...
It was/is a bit more work than what I expected, next time I will definitely
get some one to do it for me :-)
Best regards
              Luis
 On 3 Sep 2014 01:30, "RussellMc" <apptechnz@gmail.com> wrote:

> On 3 September 2014 07:26, Luis Moreira <luis.moreira1575@googlemail.com>
> wrote:
>
> > The solar panel doesn't really appeal to me. The van is high enough and
> in
> > the UK what size panel do I really need to have?
> >
>
> mp suffix =3D when operating at maximum power point =3D full sun, optimum
> alignment and loading.
> so
> Vmp =3D volts at PV panel maximum power point.
> Also Wmp, Imp
> Wmp is specified at 25 C and will be lower when panel is hot.
> SSH =3D sunshine-hour =3D 1 kW/m^2 for 1 hour.
>
> _____________
>
> London England has 4+ "sunshine hours"/day (kWh/m^2/day) average in summe=
r
> and about 0.5 SSH/day in December - January
> See
>             http://www.gaisma.com/en/location/london.html
>
> A "12V" PV panel diode connected to a battery will give about Wmp/18 x SS=
H
> Ah/day if optimumly aligned and about half that if mounted flat and not
> shadowed.
> So say Wmp/40 x SSH
> So a 100W panel would give about 100/40 x 4+ =3D 10Ah/day average in Summ=
er
> and 100/40 x 0.5 =3D~ 1.25 Ah/day in mid winter (if not snow covered :-) =
).
>
> Note:
>
> Output at low light may not meet expectations (very overcast all day) but
> as a 12V panel is 18V at Vmp it operates close to Isc as close to a curre=
nt
> source in most reasonable light conditions.
>
> If battery needs equalising panel output may be too low in mid-Winter to
> give enough current.
>
> ______________
>
> Larger (100W+) silicon crystalline PV panels are available here for about
> $NZ1 per Wmp on national auction site from a range of suppliers.
> (Astounding)
>
> Not tried yet, but I have a 30 Vmp, 250 Watt panel which I intend to moun=
t
> flat on a caravan roof for use this summer. I should [tm] be able to char=
ge
> eg laptops directly from that (with suitable converter) directly over a
> fair part of a NZ summer day.
>
>
>             Russell
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