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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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solar charger for 12v car/leisure battery
Hello,
I posted this on he camping group but I've had no replies. perhaps they are all on holiday? I was advised (on uk diy) that a leisure battery might discharge if left unused for some time and I was told that a solar charger would top-up the charge and prevent this. What size solar panel would I need? Does the output of the panel have to be a certain ration of the capacity of the battery? If so, what's the magic formula? BTW can you recommend a good make of leisure battery and any good suppliers? Thanks, Stephen. |
#2
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solar charger for 12v car/leisure battery
Stephen wrote:
I posted this on he camping group but I've had no replies. perhaps they are all on holiday? I was advised (on uk diy) that a leisure battery might discharge if left unused for some time and I was told that a solar charger would top-up the charge and prevent this. What size solar panel would I need? Does the output of the panel have to be a certain ration of the capacity of the battery? If so, what's the magic formula? BTW can you recommend a good make of leisure battery and any good suppliers? You would probably get a few opinions on uk.rec.caravanning Chris -- Chris J Dixon Nottingham UK Have dancing shoes, will ceilidh. |
#3
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solar charger for 12v car/leisure battery
In article ,
Stephen wrote: I was advised (on uk diy) that a leisure battery might discharge if left unused for some time and I was told that a solar charger would top-up the charge and prevent this. What size solar panel would I need? Does the output of the panel have to be a certain ration of the capacity of the battery? If so, what's the magic formula? The rate of self discharge of a lead acid battery is very low - I've expect it still to be healthy after the seasonal break in use. And a charge with an ordinary charger before use will be fine. Solar units are very expensive for what they are - and not reliable in the UK climate. Get a Lidl charger when they come up again - about 12 quid and small enough to fit in the pocket. -- *Why isn't 11 pronounced onety one? * Dave Plowman London SW To e-mail, change noise into sound. |
#4
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solar charger for 12v car/leisure battery
Stephen presented the following explanation :
I was advised (on uk diy) that a leisure battery might discharge if left unused for some time and I was told that a solar charger would top-up the charge and prevent this. What size solar panel would I need? Does the output of the panel have to be a certain ration of the capacity of the battery? If so, what's the magic formula? There is no magic formula. It needs to be large enough to more than cover the self discharge, plus any loads such as alarms multiplied by 2 or maybe even 3 during the shorter and darker days of winter. Likely a 5w or better unit would take care of the self discharge of a 110amp/hour leisure battery, but don't expect it to recharge the battery from flat. Cheaper and arguably better would be the use of an intelligent charger' at least every month or two, assuming the battery has no loads to support between charges. Aldi/Lidl have had these chargers on special offer several times for around £10 and they really are well worth buying and highly recommended. With one of these you can either top the charge up regularly, or simply leave it connected to the charger for the entire winter. Getting back to the solar charger... www.maplin.co.uk sell a variety of these, but if you get one make sure it is a controlled output type rather than one which simply keeps on charging irrespective of need. Over charging is as damaging as under charging, or leaving a battery to go flat. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#5
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solar charger for 12v car/leisure battery
"Harry Bloomfield" wrote in message k... Getting back to the solar charger... www.maplin.co.uk sell a variety of these, but if you get one make sure it is a controlled output type rather than one which simply keeps on charging irrespective of need. Over charging is as damaging as under charging, or leaving a battery to go flat. They have a 12W panel for £50 ATM. |
#6
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solar charger for 12v car/leisure battery
BTW can you recommend a good make of leisure battery and any good
suppliers? You would probably get a few opinions on uk.rec.caravanning Any chandlers should have a good range of solar chargers too. Not aware of any specific newsgroups though. GIYF. Al. |
#7
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solar charger for 12v car/leisure battery
In message , Stephen
writes Hello, I posted this on he camping group but I've had no replies. perhaps they are all on holiday? or out to lunch ... I was advised (on uk diy) that a leisure battery might discharge if left unused for some time and I was told that a solar charger would top-up the charge and prevent this. What size solar panel would I need? Does the output of the panel have to be a certain ration of the capacity of the battery? If so, what's the magic formula? BTW can you recommend a good make of leisure battery and any good suppliers? Just go and buy the one Maplins have on offer at the moment Solar chargers depend on light falling on the cells - otherwise more or less known as sunshine we live in the UK - go figure -- geoff |
#8
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solar charger for 12v car/leisure battery
In message , "dennis@home"
writes "Harry Bloomfield" wrote in message . uk... Getting back to the solar charger... www.maplin.co.uk sell a variety of these, but if you get one make sure it is a controlled output type rather than one which simply keeps on charging irrespective of need. Over charging is as damaging as under charging, or leaving a battery to go flat. They have a 12W panel for £50 ATM. You only want to blow the bloody doors off den you dick http://www.maplin.co.uk/Module.aspx?ModuleNo=98358 at £12 should suffice -- geoff |
#9
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solar charger for 12v car/leisure battery
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Stephen saying something like: Hello, I posted this on he camping group but I've had no replies. perhaps they are all on holiday? I was advised (on uk diy) that a leisure battery might discharge if left unused for some time and I was told that a solar charger would top-up the charge and prevent this. What size solar panel would I need? Does the output of the panel have to be a certain ration of the capacity of the battery? If so, what's the magic formula? BTW can you recommend a good make of leisure battery and any good suppliers? I've been using a cheapy 5W panel I got off ebay two years ago and it's been topping up an 80Ah battery quite happily for most of that time. Peak current from it is around 300mA during sunny days and dips to almost buggerall on really horrible overcast winter days - 17mA or so. Overall it works rather well and I'd buy another one as the need arose. |
#10
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solar charger for 12v car/leisure battery
On Mon, 23 Feb 2009 22:10:27 +0000, geoff wrote:
http://www.maplin.co.uk/Module.aspx?ModuleNo=98358 at £12 should suffice I have one of those on the genset battery. Last time I started the genny (a month or so ago) there was no problem. Panel sits behind a north facing window so doesn't generate an awful lot of juice and would put 50% more into the battery if it didn't have 50% duty cycle flashing LED... Lead Acid batteries have very low self discharge rates. 40%/year according to: http://www.batteryuniversity.com/partone-6.htm. So an 80A/hr battery 40% is 32A/hr over a year (8760hrs) = 3mA = 0.04W. So even a 1.5W panel is more than capable (even taking into account dark and cloud) of maintaining quite a decent sized battery. -- Cheers Dave. |
#11
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solar charger for 12v car/leisure battery
In article et,
Dave Liquorice wrote: Lead Acid batteries have very low self discharge rates. 40%/year according to: http://www.batteryuniversity.com/partone-6.htm. So an 80A/hr battery 40% is 32A/hr over a year (8760hrs) = 3mA = 0.04W. So even a 1.5W panel is more than capable (even taking into account dark and cloud) of maintaining quite a decent sized battery. Wonder how much current such a device *draws* from the battery in low light conditions when not charging? It must be something. -- *Rehab is for quitters. Dave Plowman London SW To e-mail, change noise into sound. |
#12
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solar charger for 12v car/leisure battery
"Dave Liquorice" wrote in message Lead Acid batteries have very low self discharge rates. 40%/year according to: http://www.batteryuniversity.com/partone-6.htm. 40% is considered very low... bloody hell, The li-po batteries i use to fly my model planes have a 2% self discharge per year, and they are working on getting that better!!! |
#13
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solar charger for 12v car/leisure battery
On Tue, 24 Feb 2009 10:30:16 +0000 (GMT), Dave Plowman (News) wrote:
Wonder how much current such a device *draws* from the battery in low light conditions when not charging? It must be something. Most have at least a protection diode so the reverse leakage of a silicon rectifier diode, few tens of nano amps? -- Cheers Dave. |
#14
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solar charger for 12v car/leisure battery
On Tue, 24 Feb 2009 03:03:33 +0000, Grimly Curmudgeon
wrote: I've been using a cheapy 5W panel I got off ebay two years ago and it's been topping up an 80Ah battery quite happily for most of that time. Peak current from it is around 300mA during sunny days and dips to almost buggerall on really horrible overcast winter days - 17mA or so. Overall it works rather well and I'd buy another one as the need arose. I have 2 x 5w panels in the South facing workshop windows connected via a charge controller / switch to the backup workshop lights. Seems to be working ok on a 10Ah gel motorcycle type battery (that I had spare). The charge controller is only there as a light switch and to protect against over-discharging the battery. As an aside it also has a couple of multi state LED's to indicate charge and battery status. It's surprising how 'dull' a day can be yet the charge indicator can still shows green. Cheers, T i m p.s. I had one of the 1.5W panels permanently connected on the dash of my old Sierra Estate and that helped keep the battery up (at least against any self discharge). |
#15
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solar charger for 12v car/leisure battery
Dave Liquorice submitted this idea :
On Tue, 24 Feb 2009 10:30:16 +0000 (GMT), Dave Plowman (News) wrote: Wonder how much current such a device *draws* from the battery in low light conditions when not charging? It must be something. Almost no leakage at all. Likely most of the leakage will be leakage from the skin oils left on the wires and devices as the unit was assembled. Having said that - the mains charger which keeps my motorcycles battery topped up (on permanent charge), has a fatal flaw in its design. If connected to the battery, but not plugged into the mains it flattened the battery via its charge status display. Long power cut, or mcb trip =flat battery. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#16
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solar charger for 12v car/leisure battery
On Wed, 25 Feb 2009 20:19:58 GMT, Harry Bloomfield
wrote: Dave Liquorice submitted this idea : On Tue, 24 Feb 2009 10:30:16 +0000 (GMT), Dave Plowman (News) wrote: Wonder how much current such a device *draws* from the battery in low light conditions when not charging? It must be something. Almost no leakage at all. Likely most of the leakage will be leakage from the skin oils left on the wires and devices as the unit was assembled. Having said that - the mains charger which keeps my motorcycles battery topped up (on permanent charge), has a fatal flaw in its design. If connected to the battery, but not plugged into the mains it flattened the battery via its charge status display. Long power cut, or mcb trip =flat battery. Optimate? -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#17
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solar charger for 12v car/leisure battery
Mark was thinking very hard :
On Wed, 25 Feb 2009 20:19:58 GMT, Harry Bloomfield wrote: Dave Liquorice submitted this idea : On Tue, 24 Feb 2009 10:30:16 +0000 (GMT), Dave Plowman (News) wrote: Wonder how much current such a device *draws* from the battery in low light conditions when not charging? It must be something. Almost no leakage at all. Likely most of the leakage will be leakage from the skin oils left on the wires and devices as the unit was assembled. Having said that - the mains charger which keeps my motorcycles battery topped up (on permanent charge), has a fatal flaw in its design. If connected to the battery, but not plugged into the mains it flattened the battery via its charge status display. Long power cut, or mcb trip =flat battery. Optimate? Yes and three times replaced under guarantee due to the first two failing within weeks of delivery. The present one seems to be hanging in there, two years use so far, but still not a good design. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#18
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solar charger for 12v car/leisure battery
On Thu, 26 Feb 2009 18:26:38 GMT, Harry Bloomfield
wrote: Mark was thinking very hard : On Wed, 25 Feb 2009 20:19:58 GMT, Harry Bloomfield wrote: Dave Liquorice submitted this idea : On Tue, 24 Feb 2009 10:30:16 +0000 (GMT), Dave Plowman (News) wrote: Wonder how much current such a device *draws* from the battery in low light conditions when not charging? It must be something. Almost no leakage at all. Likely most of the leakage will be leakage from the skin oils left on the wires and devices as the unit was assembled. Having said that - the mains charger which keeps my motorcycles battery topped up (on permanent charge), has a fatal flaw in its design. If connected to the battery, but not plugged into the mains it flattened the battery via its charge status display. Long power cut, or mcb trip =flat battery. Optimate? Yes and three times replaced under guarantee due to the first two failing within weeks of delivery. The present one seems to be hanging in there, two years use so far, but still not a good design. I was always told they were the "rolls royce" m/c battery charger. I've recently bought one too! -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#19
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solar charger for 12v car/leisure battery
On 27 Feb, 09:09, Mark wrote:
Optimate? I was always told they were the "rolls royce" m/c battery charger. I've recently bought one too! Several of my friends have independently reported Optimates as killing their m/c batteries http://latexiron.livejournal.com/468457.html |
#20
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solar charger for 12v car/leisure battery
In article ,
Mark wrote: Optimate? Yes and three times replaced under guarantee due to the first two failing within weeks of delivery. The present one seems to be hanging in there, two years use so far, but still not a good design. I was always told they were the "rolls royce" m/c battery charger. I've recently bought one too! They are a total ripoff price wise. They should cost little more than any similar sized PS. -- *Bills travel through the mail at twice the speed of cheques * Dave Plowman London SW To e-mail, change noise into sound. |
#21
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solar charger for 12v car/leisure battery
On Fri, 27 Feb 2009 20:27:56 +0000 (GMT), "Dave Plowman (News)"
wrote: In article , Mark wrote: Optimate? Yes and three times replaced under guarantee due to the first two failing within weeks of delivery. The present one seems to be hanging in there, two years use so far, but still not a good design. I was always told they were the "rolls royce" m/c battery charger. I've recently bought one too! They are a total ripoff price wise. They should cost little more than any similar sized PS. They're a lot more than a PSU though. They are supposed to do testing and recovery from deep discharge. They have gone up a lot in price since I bought mine though. -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#22
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solar charger for 12v car/leisure battery
In article ,
Mark wrote: They are a total ripoff price wise. They should cost little more than any similar sized PS. They're a lot more than a PSU though. Hence the 'little more' bit. They are supposed to do testing A proper tester costs a great deal. If they did a proper test then they'd be worth the cost. But they don't. and recovery from deep discharge. As do others at a fraction of the price. They have gone up a lot in price since I bought mine though. Yup. One born every minute. -- *All those who believe in psychokinesis, raise my hand * Dave Plowman London SW To e-mail, change noise into sound. |
#23
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solar charger for 12v car/leisure battery
On Mon, 02 Mar 2009 10:38:11 +0000 (GMT), "Dave Plowman (News)"
wrote: In article , Mark wrote: They are a total ripoff price wise. They should cost little more than any similar sized PS. They're a lot more than a PSU though. Hence the 'little more' bit. They are supposed to do testing A proper tester costs a great deal. If they did a proper test then they'd be worth the cost. But they don't. What should a "proper tester" do that the Optimate doesn't? and recovery from deep discharge. As do others at a fraction of the price. Which ones? They have gone up a lot in price since I bought mine though. Yup. One born every minute. What's that supposed to mean? -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
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