From 7b7833c882dab26c2594414f11f605f2969d0f41 Mon Sep 17 00:00:00 2001 From: Sam Wenham Date: Tue, 23 Dec 2014 17:48:01 +0000 Subject: [PATCH] First attempt at an updated version of the solar page, should be a little more uptodate --- handbook/solar.html | 68 ++++++++++++++++++++++++++------------------- 1 file changed, 40 insertions(+), 28 deletions(-) diff --git a/handbook/solar.html b/handbook/solar.html index 5d43f4c3c..5481d5ca2 100644 --- a/handbook/solar.html +++ b/handbook/solar.html @@ -16,29 +16,52 @@

Summary

Since 2003 the bivy site at the stone bridge has had a number of solar panels and a car battery, which are mainly used for charging homemade battery packs, drill and AA/AAA batteries. This document is unfortunately written from memory, so someone with some electronics knowledge and a multimeter should set things up, so they can spot the errors and omissions in this document. -

Martin's bodged together Tupperware box is a retro fit to Earls original system. The Tupperware box controls the charging and discharging of an external lead acid battery. Whereas before, Earls box did not do this and thus risked cooking the battery or completely flattening it. This means that the labels on the Earls well constructed box no longer apply. It may well be a good idea to relabel things.

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The system is actually two independent systems running in parallel. +

+

The system can be made moderately weather proof, but in very windy or wet weather, it should be bought into the relative safety of the stone bridge.

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Since 2014, we've found that this current webpage bears no resemblance to what is actually up at topcamp. The following is still updates in progress, notable additions are in bold.

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Equipment stored up the hill

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  • Four 12V solar panels in a aluminium frame
    • -
  • Three big floppy solar panels
    • -
  • A massive-fuck-off wooden frame, presumably to mount the solar panels on
  • -
  • Charge-Discharge circuit (Tupperware box)
    • -
  • Power Distribution box
    • -
  • Lead-acid 12V Car battery ~40Ah
    • -
  • Another Lead-acid 12V Car battery
    • -
  • Multimeter
    • + -

    To Be Continued... -The below is still out of date, but I got shouted at when I said that I was about to change it... +

    Setup of big solar panels

    +

    The three big solar panels are bolted to the big wooden frame using spare non structural bolts on the frame (ie not on a joint). The panles have to be overlaped to fit. This whole frame is then lashed to the stone bridge using the 4 spits just above the animal hole. The cable with the connectors that fit these panles is then run through the small gap in the animal hole end wall and up to the back of the bivi. The solar pannel cable is then connected to the solar input on the "bent plastic" charge regulator. The big battery is connected to the battery connectors of the "bent plastic" charge regulator

    -

    Setup of solar panels

    -Four 12V solar panels are mounted on an aluminium frame, which has been put on some flat limestone, slightly downhill and to the right from the stone bridge. The solar panels are waterproof, but are liable to be being blown over and damaged, hence large rocks must be used to keep it in place. The panels should be orientated pointing into the sun, without any shadows on them. Looking at the panels you can see the individual ~0.6V photo-arrays, each one not getting sunlight reduces the voltage output of the panel. There is also a fifth panel that can be propped against a rock in good weather. +

    Setup of smaller solar panels

    +

    In 2014 the smaller panels were perched on the stone bridge above the big panels as no frame emerged from Tramgold! The solar panels are connected to the circuit to it in parallel to give ~12V input (i.e. connect all the red and all the black solar panel banana plugs together, to make a long red stick and a separate long black stick). Then plug the two banna plugs on the end of the long cable into the end of the stick and insulate the two exposed ends of the sticks (we don't want them connecting!!). Now run the cable for this the same route as the big pannel cable. Connect the far end of this cable to the solar input on the project box charger and connect the small battery to the battery terminals of this box

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    Setup of charge-discharge circuit

    +

    Waterproofing

    +All the circuits should be covered with plastic sheeting (There should be a cut open inglesport bag for that purpose). The sheeting is held down by medium sized rocks all around its perimeter and the liberal application of gaffer tape to hold it all togeather. + +

    24V drill battery charging

    +To charge 24V drill batteries, the four solar panels should be connected together with two pairs of serially connected solar panels connected together in parallel. Crocodile clips can then be used to connect to the battery terminals. Note that the battery will not stop charging, and may damage the battery if left to over charge. + +

    Putting the battery away

    +Store the battery full, this means that you should stop discharging the battery a few days before it is to be put away to allow it to charge. Grease the battery terminals, and place the battery where it will stay dry, do not cover with anything that may get soggy and short the battery (e.g. cardboard box). + +

    Thanks

    +On behalf on anyone using the system, thanks go to Earl Merson who provided most of the equipment, and more importantly carried a car battery up the hill. More thanks go to whoever carries it down again should it ever become knackered. + +
    + +

    This is mostly historic

    +Four 12V solar panels were are mounted on an aluminium frame, which has been put on some flat limestone, slightly downhill and to the right from the stone bridge. The solar panels are waterproof, but are liable to be being blown over and damaged, hence large rocks must be used to keep it in place. The panels should be orientated pointing into the sun, without any shadows on them. Looking at the panels you can see the individual ~0.6V photo-arrays, each one not getting sunlight reduces the voltage output of the panel. There is also a fifth panel that can be propped against a rock in good weather.

    + +

    Setup of charge-discharge circuit

    The next part is to connect the lead-acid charge-discharge circuit, which is found mounted in a Tupperware box with wires coming out. The solar panels are then connected to the circuit to it in parallel to give ~12V input (i.e. connect all the red and all the black solar panel banana plugs together, to make a long red stick and a separate long black stick). The car battery should also be connected to the circuit, and so should the power distribution box (The one that looks like it has been properly made and designed).

    The charge discharge circuit contains a fuse some LEDs and a toggle switch. It has three modes: @@ -49,20 +72,9 @@ The next part is to connect the lead-acid charge-discharge circuit, which is fou

    It is left to the user to work out the interface, to work out the mode from the LEDs etc. The circuit will automatically enter the charged and discharged state at set voltages, which are adjustable by two potentiometers. Do not adjust these unless you know what you are doing, they should remain at sensible values. To get back into the partially charged state from the discharged, it is necessary to push the toggle switch. -

    Setup of the power distribution circuit

    +

    Setup of the power distribution circuit

    The input power from the charge-discharge circuit, goes into the connectors marked solar panels, the battery connectors are now redundant. This box is also fused, and has a number of cigarette socket outputs, a four way cigarette socket adaptor, will increase this number. Note that battery power is not unlimited, so any chargers at the stone bridge do not mean that you should not carry your batteries down the hill to be charged when you are able. -

    Waterproofing

    -All the circuits should be covered with plastic sheeting (There should be a cut open inglesport bag for that purpose). The sheeting is held down by medium sized rocks all around its perimeter. - -

    24V drill battery charging

    -To charge 24V drill batteries, the four solar panels should be connected together with two pairs of serially connected solar panels connected together in parallel. Crocodile clips can then be used to connect to the battery terminals. Note that the battery will not stop charging, and may damage the battery if left to over charge. - -

    Putting the battery away

    -Store the battery full, this means that you should stop discharging the battery a few days before it is to be put away to allow it to charge. Grease the battery terminals, and place the battery where it will stay dry, do not cover with anything that may get soggy and short the battery (e.g. cardboard box). - -

    Thanks

    -On behalf on anyone using the system, thanks go to Earl Merson who provided most of the equipment, and more importantly carried a car battery up the hill. More thanks go to whoever carries it down again should it ever become knackered.