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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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sean Downsizer Moderator
Joined: 28 Oct 2004 Posts: 42219 Location: North Devon
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buzzy
Joined: 04 Jan 2011 Posts: 3708 Location: In a small wood on the edge of the Huntingdonshire Wolds
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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dpack
Joined: 02 Jul 2005 Posts: 46227 Location: yes
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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dpack
Joined: 02 Jul 2005 Posts: 46227 Location: yes
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Posted: Wed Apr 17, 19 12:15 pm Post subject: |
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lights no prob
tools ,depends what they are , if they are like mine they need a fair bit of feeding at 18v or 28 v which means inverter and dedicated charger
pooter, my decent laptop ate a `12v 80ah gel cell via an inverter in about 10 hours so for a rough guide 1 hr of pooting = about 10 ah from 12 v storage
small low energy telly no prob especially if it has a "portable" design with a low voltage power input to avoid using the inverter.
a fairly major point is input voltages if they are under the voltage of the storage system there is a smallish power loss between panel and use, however if the input voltage is above that of the storage you lose at least 30 % at the inversion to 230v stage as well as a smaller loss dropping 2vo to a suitable input voltage and current suitable for that battery or appliance.
you also need to allow for panel out put which can vary quite a lot depending on how sunny it is, orientation ( a bit limited with a panel bolted flat on a van roof ), temperature and have you recently cleaned it ( road muck can cover a panel quite effectively )
a rough guide is you need more panel than the numbers on the adverts might suggest but you do not need too much for the system to cope with on a cold ,sunny , perfectly orientated day.
at a guess you need a couple of meters square of panel but chatting with boaters and motor home folk will probably be a good guide to the real world value of pv and power from the engine when it is running
iirc most folk seem to have bulk power generated from the engine to the storage batteries and the pv keeps that topped up while parked up for a while
full pv for tools pooter etc etc would probably need the sort of panel area you see on a house roof and a rather neat storage and control rig to be a practical option.
all the usual caveats regarding leccy with a couple of special ones such as:
pv has a variable output from the panels and you need varied inputs for a range of appliances .
you say you have everything but the panel but is it up to having a new panel system put on top?
are the storage bank batteries in good condition ? what is the total capacity?
are the wires and control gear up to providing the power you need?
huge subject
ps i have enough bits and meters to start working out what my new usb/5.5v super low voltage rig can do .
i decided large power use was impractical for a mobile kit (so far all the parts are under 5kg inc lots of li rechargeable aa/aaa batteries for assorted equipment such as night vis, cb's, gps, camera, decent radio etc etc etc )
phones etc are not very power hungry but they need a rather smooth power supply provided by the li power bank rather than direct which is possible but a bit risky
imho the way to go is to work out how little power you need and work from that rather than start from how much power can i harvest.
ie reduce demand to a minimum and it is easier to provide it
and
the engine [ or a genny if static ( or the grid with a hook up ) ] is your best bet for enough power to charge tool batteries or run a half decent pooter |
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mousjoos
Joined: 05 Jun 2006 Posts: 1986 Location: VERY Sunny SW France
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dpack
Joined: 02 Jul 2005 Posts: 46227 Location: yes
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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dpack
Joined: 02 Jul 2005 Posts: 46227 Location: yes
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dpack
Joined: 02 Jul 2005 Posts: 46227 Location: yes
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mousjoos
Joined: 05 Jun 2006 Posts: 1986 Location: VERY Sunny SW France
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dpack
Joined: 02 Jul 2005 Posts: 46227 Location: yes
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