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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Charging leisure battery.
I have a customer with a small chalet with no electricity. I fitted a basic domestic alarm connected to a 75 ah leisure battery. What would be best to trickle charge the battery wind or solar power. Also the charging device would have to be about 20-30 feet away from the chalet because of tree cover. Any help much appreciated. Let me know if you need more info.
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#2
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Charging leisure battery.
"Alec" wrote in message ... I have a customer with a small chalet with no electricity. I fitted a basic domestic alarm connected to a 75 ah leisure battery. What would be best to trickle charge the battery wind or solar power. Also the charging device would have to be about 20-30 feet away from the chalet because of tree cover. Any help much appreciated. Let me know if you need more info. Based on observed practice, I'd suggest wind. I've noticed a large number of Rutland (type) wind chargers on boats I see on a regular walk I do. Even this morning I noticed one that was spinning two quick to count the blades but the wind was imperceptible. It was very compact, blades turning diameter probably only 15" or so. May be worth dipping into the rec.boat.electronics newsgroup, the application is similar. -- 73 Brian www.g8osn.org.uk |
#3
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Charging leisure battery.
On Sat, 17 Jun 2006 11:32:10 +0100, Alec wrote:
| |I have a customer with a small chalet with no electricity. I fitted a |basic domestic alarm connected to a 75 ah leisure battery. What would |be best to trickle charge the battery wind or solar power. Also the |charging device would have to be about 20-30 feet away from the chalet |because of tree cover. Any help much appreciated. Let me know if you |need more info. This FAQ is about caravanning, but describes all the methods I know about. You can caravan without that orange cable FAQ --------------------------------------------- This FAQ is intended to give some pointers on how to caravan without that orange cable, or at a site where hookups are not available. It does not try to say what is best, because that will depend on your individual circumstances, but does try to give basic information about the methods and the advantages and disadvantages of each alternative. For general information on batteries see: http://www.batteryfaq.org, this is a bit US oriented, but lead acid batteries are much the same worldwide. Domestic multimeters now cost as little as ?2.50 and are useful for caravan work. A new fully charged 110Ah Leisure Battery will last most people for a weekend, but very few a week. For longer than a few days you will have to recharge the battery somehow. Remember that as batteries get older and as they have more use/misuse they will hold less charge, and eventually need replacing. Leisure batteries are usually *not* the no maintenance batteries becoming common in cars. If yours allows topping up, always check your electrolyte, and top up to marks on the body with distilled/deionized water regularly. You should always charge your battery(s) before you leave home, either on the bench, or by leaving the van powered up, you should give either method several days to fully charge. Cheap chargers make gas, so you must top up the electrolyte. Expensive electronic chargers do not fully charge the battery, and make less gas so need topping up less frequently. Remember also that the electrolyte will evaporate slowly even while the battery is unused. There is very little power in a leisure battery so you should use it as sparingly as practicable. You should use LPG for as many things as possible. You should also make sure that the your electric appliances will run off 12 Volts. High power electrical equipment is bad news. A 1000 watt heater used on its own, will run for less than 1 1/2 hours, 500 watts less than 3 hours. 250 watts some 5 hours. As a general rule something like a TV taking 50W or 4 amps for a few hours per day is the heaviest load practicable. The output voltage of a battery falls slowly as a charge is used, and eventually the 12 V equipment will stop working. TVs etc. need as many volts as possible. Thin long wires which may be supplied by the van manufacturer or as a D.I.Y. addition, may have a high voltage drop. If possible add extra wiring for TV, or other electronic equipment, of thick wires ?2 sq mm? or preferably more, and as short runs as practicable. You should find out how much charge you use on an average day in the van. The maths is simple 110AH=1320wattHours. watts=12*amps, amps=watts/12, at 12 V DC. Find how many watts/amps each appliance uses from labels or instructions. Multiply these by the hours each is used daily. Add daily charge used in watthours or amperehours used by each of your appliances together to give daily charge used. You should replace this charge averaged over 2-3 days. There are many alternative ways of replacing this charge, the choice is yours, and will depend on your personal circumstances. Beware especially of red "standby" LEDs, the circuit behind them uses about 7 watts, which is a tiny amount of power, but they are on 24 hrs, less the hours they are used, per day. Allow 12 ampere hours or 144 watthours *each* per day, which is a significant drain on the battery. Car --- You can use two batteries. An extra battery can be charged in the back of the car via a split charge relay. This battery should be securely fastened into the car. The batteries contain Sulphuric acid which is nasty stuff and if the battery tips over it can do a lot of harm to the car. Also if you have a crash a battery hitting the back of your head may cause serious injury. The tiny amounts of hydrogen and oxygen produced, should cause no problems, in a well ventilated car. If you use marine batteries, many of these will dump the gasses overboard via a plastic tube. If you go out in the car and "do" things on most days while using the van, this should give you enough charge. If you stay on site or just drive to the local town/beach this method will not work for you. At some sites battery charging facilities are available. Swap the batteries daily or at slightest sign of low voltage. Be warned however that batteries are heavy and cumbersome to change, and this is not a method for the unfit. You should ensure that when the van is being towed the battery is actually being charged. There are no less than three ways in which the van can be wired, and three ways in which the car can be wired giving ?5? combinations, some of which do not charge the van battery when towing. see: http://www.volvoclub.org.uk/towbar_electrics.htm. If you tour continuously this will be important, but if you just tow to a site and eventually home again you can probably ignore this method. Solar ----- Solar cells are available specifically for vans, but are rated pointing directly at full sun, which rarely happens in UK, but they do give some output even on cloudy days, unfortunately the retailers do not tell you how much. If possible point your cells due south, slightly below the maximum local elevation of the sun. As a general rule you will need *big* cells 25 watts or preferably more. The Australians with all their sun fit 80 watt solar panels or larger. If you calculate charge needed as above, you can get a better estimate of the size of cells required. Wind ---- Wind generators are rated at a high wind speed which rarely happens in an English summer, they give a lower output at lower wind speeds. The power from a wind generator varies as the *cube* of the windspeed, so half the wind speed gives a eighth of the power. Many caravan sites in the countryside are surrounded by trees, which reduce wind speeds. Other sites by the seaside are better for wind generators. As a general rule you will need a 25Watt generator or preferably more powerful. If you calculate charge needed as above you can get a better estimate of the size of generator required. Generators ---------- Portable petrol driven generators with 240Vac output can be plugged into your van. They however make a noise which other campers find objectionable. These generators will also charge your battery, but how much will depend on the generator and charger in use. Most sites will forbid their use during the night, so you will need to use 12V for some of the time. Invertors --------- Invertors which change 12Vdc to 230Vac, are commonly available. Increase the charge calculated above by up to 20% for things run via invertors. These should be wired directly to the equipment which uses 230VAC. Do not wire the output of the invertor to the van 230VAC sockets, which run the charger, which runs the invertor, which runs the charger .... -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#4
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Charging leisure battery.
On Sat, 17 Jun 2006 11:32:10 +0100, Alec wrote:
| |I have a customer with a small chalet with no electricity. I fitted a |basic domestic alarm connected to a 75 ah leisure battery. What would |be best to trickle charge the battery wind or solar power. Also the |charging device would have to be about 20-30 feet away from the chalet |because of tree cover. Any help much appreciated. Let me know if you |need more info. Not what you asked, but it strikes me that if your customer is paying for a leisure battery, plus charging system, they will have enough charge in the battery to run a few 12V lights, a water pump and all the usual things you can find in a caravan, including a 12V TV. They would need at least 2 amps from the trickle charger to do that. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#5
Posted to uk.d-i-y
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Charging leisure battery.
On Sat, 17 Jun 2006 11:32:10 +0100, Alec wrote:
I have a customer with a small chalet with no electricity. I fitted a basic domestic alarm connected to a 75 ah leisure battery. What would be best to trickle charge the battery wind or solar power. Also the charging device would have to be about 20-30 feet away from the chalet because of tree cover. Any help much appreciated. Let me know if you need more info. I have a slightly larger installation at my farm, with 800AH of battery, however I started with 100AH of battery so I've been through what you are trying to do. The short answer is that you need both and a charge controller. For what you are looking to do one of the Rutland charge controllers will fit the bill. They have two inputs, solar and wind and will dump the current from the wind generator to a diversion load when the battery is fully charged. I would suggest that you start with a solar panel, and then add a wind gneerator if necessary. However I also work on eletrical/electronic installations on motorways and if you look you will see that for low current drain stuff we use solar only, for higher drain uses we have both wind and solar. You'll forgive, I am sure my tetchiness at tradesmen who take on a job that they are unqualified to do and then come to a diy group to find out how to do it. |
#6
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Charging leisure battery.
On Sat, 17 Jun 2006 14:02:46 +0100, Steve Firth
wrote: |I would suggest that you start with a solar panel, and then add a wind |gneerator if necessary. However I also work on eletrical/electronic |installations on motorways and if you look you will see that for low |current drain stuff we use solar only, for higher drain uses we have both |wind and solar. What are those green boxes which you see beside motorways, with a solar panel on the top? -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#7
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Charging leisure battery.
In article ,
Alec wrote: I have a customer with a small chalet with no electricity. I fitted a basic domestic alarm connected to a 75 ah leisure battery. Why so large? -- *Aim Low, Reach Your Goals, Avoid Disappointment * Dave Plowman London SW To e-mail, change noise into sound. |
#8
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Charging leisure battery.
On Sat, 17 Jun 2006 17:50:33 +0100, "Dave Plowman (News)"
wrote: |In article , | Alec wrote: | I have a customer with a small chalet with no electricity. I fitted a | basic domestic alarm connected to a 75 ah leisure battery. | |Why so large? That is the *small* one. Caravanners usually have 110ah -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#9
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Charging leisure battery.
On Sat, 17 Jun 2006 14:32:24 +0100, Dave Fawthrop wrote:
On Sat, 17 Jun 2006 14:02:46 +0100, Steve Firth wrote: |I would suggest that you start with a solar panel, and then add a wind |gneerator if necessary. However I also work on eletrical/electronic |installations on motorways and if you look you will see that for low |current drain stuff we use solar only, for higher drain uses we have both |wind and solar. What are those green boxes which you see beside motorways, with a solar panel on the top? They are traffic counting devices. The box is linked to a set of loops buried in the road surface one pair of loops in each lane. You can usually see the loops as a shiny outline on the road surface. The green box counts traffic flow and sends the data back to the National Traffic Control Centre. NTCC use the data to work out where there are serious delays and then set messages on the EMS signs to divert traffic around the problem. |
#10
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Charging leisure battery.
On Sat, 17 Jun 2006 17:50:33 +0100, Dave Plowman (News) wrote:
In article , Alec wrote: I have a customer with a small chalet with no electricity. I fitted a basic domestic alarm connected to a 75 ah leisure battery. Why so large? You can realistically only draw around 35% of total capacity, so it's functionally a 25AH battery. It's probably oversized, I would guess that the actual requirement is closer to 8-10AH, but at least it will give some headroom for a couple of days power outage. |
#11
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Thanks for all the replies. I will definitely look into the rutland equipment and let my customer know. I have also had some luck with my local supplier (after I had posted) who also recommended solar first and wind as a backup if needed. Thanks guys much appreciated |
#12
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Charging leisure battery.
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Steve Firth saying something like: You'll forgive, I am sure my tetchiness at tradesmen who take on a job that they are unqualified to do and then come to a diy group to find out how to do it. Everybody's got to start somewhere with this kind of thing. You had to, yourself. -- Dave |
#13
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Charging leisure battery.
On Sat, 17 Jun 2006 21:06:35 +0100, Steve Firth
wrote: |On Sat, 17 Jun 2006 14:32:24 +0100, Dave Fawthrop wrote: | | On Sat, 17 Jun 2006 14:02:46 +0100, Steve Firth | wrote: | ||I would suggest that you start with a solar panel, and then add a wind ||gneerator if necessary. However I also work on eletrical/electronic ||installations on motorways and if you look you will see that for low ||current drain stuff we use solar only, for higher drain uses we have both ||wind and solar. | | What are those green boxes which you see beside motorways, with a solar | panel on the top? | |They are traffic counting devices. The box is linked to a set of loops |buried in the road surface one pair of loops in each lane. You can usually |see the loops as a shiny outline on the road surface. The green box counts |traffic flow and sends the data back to the National Traffic Control |Centre. NTCC use the data to work out where there are serious delays and |then set messages on the EMS signs to divert traffic around the problem. Thanks! -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#14
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Charging leisure battery.
On Sun, 18 Jun 2006 00:32:19 +0100, Grimly Curmudgeon wrote:
We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Steve Firth saying something like: You'll forgive, I am sure my tetchiness at tradesmen who take on a job that they are unqualified to do and then come to a diy group to find out how to do it. Everybody's got to start somewhere with this kind of thing. You had to, yourself. Umm yes, but I'm not selling my services, to others. I'm a DIY loon having fun at my own expense. |
#15
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Thats what the customer has to be honest no other reason. But everytime I do a load test it only registers about 40-50ah. Even after a full charge. |
#16
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Charging leisure battery.
On Mon, 19 Jun 2006 00:28:27 +0100, Alec wrote:
Steve Firth Wrote: On Sun, 18 Jun 2006 00:32:19 +0100, Grimly Curmudgeon wrote: We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Steve Firth saying something like: You'll forgive, I am sure my tetchiness at tradesmen who take on a job that they are unqualified to do and then come to a diy group to find out how to do it. Everybody's got to start somewhere with this kind of thing. You had to, yourself. Umm yes, but I'm not selling my services, to others. I'm a DIY loon having fun at my own expense. I hadn't even noticed your tetchiness to be honest and as a NACOSS Gold (now NSI) approved engineer in all aspects of CCTV, Access control and Intruder alarms for 16 years who are you to say I'm unqualified. How many offline power systems have you installed? Your post indicates this is the first, hence you are unqualified in this respect. **** me are you going to join Drivel in the stupid bin? |
#17
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http://dictionary.cambridge.org/defi...5898&dict=CALD Sorry about that everyone else thought I had better set the record straight and thanks for your posts and ideas it has been a help. Anymore ideas or info/experience would be much appreciated. |
#18
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Charging leisure battery.
In message , Alec
writes Steve Firth Wrote: On Sun, 18 Jun 2006 00:32:19 +0100, Grimly Curmudgeon wrote: We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Steve Firth saying something like: Remember it's DIY Banter. Sort of explains it clueless ****wits who post on UK.d-i-y -- geoff |
#19
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Charging leisure battery.
On Mon, 19 Jun 2006 00:28:27 +0100, Alec wrote:
|I haven't had a 240vac |supply and also a customer who only visits the site once every 2 |months over winter hence the need to keep the battery in good nick. Leisure batteries (when not maintenance free) require topping up at intervals. Insist that your customer tops up the battery at regular intervals. 2 monthly should be fine, if you install some sort of charge controller. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#20
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Charging leisure battery.
On Mon, 19 Jun 2006 06:39:41 +0100, Dave Fawthrop wrote:
Leisure batteries (when not maintenance free) require topping up at intervals. Insist that your customer tops up the battery at regular intervals. 2 monthly should be fine, if you install some sort of charge controller. Errrm, if he fits a solar panel and a Rutland (or similar) controller the idea is that the battery will be topped up continuously in daylight hours. The problem is that in winter the days will be short, the sun will be of much lesser intensity and snowfall or days of low cloud will leave the possibility that the panel fails to charge the battery. This is why a second source such as a wind generator is a good idea. |
#21
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Charging leisure battery.
On Mon, 19 Jun 2006 09:26:16 +0100, Steve Firth
wrote: |On Mon, 19 Jun 2006 06:39:41 +0100, Dave Fawthrop wrote: | | Leisure batteries (when not maintenance free) require topping up at | intervals. Insist that your customer tops up the battery at regular | intervals. 2 monthly should be fine, if you install some sort of charge | controller. | |Errrm, if he fits a solar panel and a Rutland (or similar) controller the |idea is that the battery will be topped up continuously in daylight hours. |The problem is that in winter the days will be short, the sun will be of |much lesser intensity and snowfall or days of low cloud will leave the |possibility that the panel fails to charge the battery. This is why a |second source such as a wind generator is a good idea. Sorry I meant top up with distilled/deionised water. I lost a leisure battery with zig charge controller through not topping it up with distilled/deionised water :-( -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#22
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Charging leisure battery.
On Mon, 19 Jun 2006 13:55:09 +0100, Dave Fawthrop wrote:
On Mon, 19 Jun 2006 09:26:16 +0100, Steve Firth wrote: |On Mon, 19 Jun 2006 06:39:41 +0100, Dave Fawthrop wrote: | | Leisure batteries (when not maintenance free) require topping up at | intervals. Insist that your customer tops up the battery at regular | intervals. 2 monthly should be fine, if you install some sort of charge | controller. | |Errrm, if he fits a solar panel and a Rutland (or similar) controller the |idea is that the battery will be topped up continuously in daylight hours. |The problem is that in winter the days will be short, the sun will be of |much lesser intensity and snowfall or days of low cloud will leave the |possibility that the panel fails to charge the battery. This is why a |second source such as a wind generator is a good idea. Sorry I meant top up with distilled/deionised water. I lost a leisure battery with zig charge controller through not topping it up with distilled/deionised water :-( I'd suspect the charge controller. It sounds like it was boiling the battery. For unattended use I'd probably use a relatively expensive spiral cell/gel Optima battery just for the maintenance free aspect. I actually use an array of 2V cells sourced from a computer consultancy that was retiring a massive UPS. They cost peanuts and are simple to maintain. |
#23
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Charging leisure battery.
On Mon, 19 Jun 2006 18:01:19 +0100, Steve Firth
wrote: |On Mon, 19 Jun 2006 13:55:09 +0100, Dave Fawthrop wrote: | | On Mon, 19 Jun 2006 09:26:16 +0100, Steve Firth | wrote: | ||On Mon, 19 Jun 2006 06:39:41 +0100, Dave Fawthrop wrote: || || Leisure batteries (when not maintenance free) require topping up at || intervals. Insist that your customer tops up the battery at regular || intervals. 2 monthly should be fine, if you install some sort of charge || controller. || ||Errrm, if he fits a solar panel and a Rutland (or similar) controller the ||idea is that the battery will be topped up continuously in daylight hours. ||The problem is that in winter the days will be short, the sun will be of ||much lesser intensity and snowfall or days of low cloud will leave the ||possibility that the panel fails to charge the battery. This is why a ||second source such as a wind generator is a good idea. | | Sorry I meant top up with distilled/deionised water. | I lost a leisure battery with zig charge controller through not topping it | up with distilled/deionised water :-( | |I'd suspect the charge controller. It sounds like it was boiling the |battery. No I checked the zig charger it worked fine, just the occasional bubble, but over a year the occasional bubble adds up to quite a lot of water. The battery I replaced it with works fine after several years, topping up with deionised water every month or two. Also Sulphuric acid does evaporate, just like water. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#24
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Charging leisure battery.
In article ,
Dave Fawthrop wrote: No I checked the zig charger it worked fine, just the occasional bubble, but over a year the occasional bubble adds up to quite a lot of water. The battery I replaced it with works fine after several years, topping up with deionised water every month or two. Also Sulphuric acid does evaporate, just like water. The so called 'sealed' or maintenance free battery in my car is over 4 years old and never been topped up - these days they use a method of recovering the evaporation. Of course modern car systems don't overcharge the battery - indeed most don't actually take it to the maximum charge. -- *What do little birdies see when they get knocked unconscious? * Dave Plowman London SW To e-mail, change noise into sound. |
#25
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I think we will now use both types of charging system as we now can see flaws in solar only and indeed wind only. I have spoken to some more suppliers with some success so it looks like we may be getting somewhere.Thanks for all the constructive posts. |
#26
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Charging leisure battery.
On Mon, 19 Jun 2006 21:11:12 +0100, "Dave Plowman (News)"
wrote: |In article , | Dave Fawthrop wrote: | No I checked the zig charger it worked fine, just the occasional bubble, | but over a year the occasional bubble adds up to quite a lot of water. | The battery I replaced it with works fine after several years, topping | up with deionised water every month or two. Also Sulphuric acid does | evaporate, just like water. | |The so called 'sealed' or maintenance free battery in my car is over 4 |years old and never been topped up - these days they use a method of |recovering the evaporation. Of course modern car systems don't overcharge |the battery - indeed most don't actually take it to the maximum charge. Leisure batteries are normally of the old type. Maintenance free ones are rare. I did mention them upthread in the original post if you look. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
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