Went to pick up MH at weekend and battery completely dead - it had been in storage for 4 months! I've seen a small solar panel for topping up main battery. Any good? Any experience of these?
Or should we just disconect battery? Will it hold its charge for usual winter lay-up of 3 months?
Hi,I have one of these its good for keeping the battery topped up while van is not in use,but the battery needs to be fully charged to start with the panel is not capable of charging up a flat battery. hope this helps.
------------- Cheers Jim.I Reserve The Right To Be Wrong.
o to maplins, they have a sale on at the moment, they got quite a choice of small but powerflul solar panels, one of them is ideal for what you intend to use it for.
Maplins have got a 13watt panel for £59.99 with charge regulator included , I'v already got 120 watts panel for my leisure battery's and I'm going to get one from maplins for my start battery it should cheap it topped up nicely
Quote: Originally posted by borerider on 19/4/2008
Maplins have got a 13watt panel for £59.99 with charge regulator included , I'v already got 120 watts panel for my leisure battery's and I'm going to get one from maplins for my start battery it should cheap it topped up nicely
Why not just put the feed thru your vehicle battery and then via a split charge relay to your Leisures? This is what I have done and its worked for the last 4 years, no worries
Quote: Originally posted by rozinante on 19/4/2008
What triggers the relay though? Output from the regulator?
I use one of THESE I don't use anything but Antares for all my electrical gear including Inverters but then I tend go off beyond The Black Stump and whatever I use has got to be reliable.
There is also STERLING and their stuff has a good rep. There are also quite a few other products on the market. I think that the item is termed a "choke" diode but I'm not 100% on that
Why not use a double pole switch ie, on/off/on re, first position for main vehicle battery middle off of course when engine is running and other position for leisure thats the way a friend wired mine up on a Autotrail Cherokee that i had 7 years ago. I do have the wiring diagram in the house somewhere, if i can find it?, if you wish i can possibly describe it on this forum, unfortunately i still don't know how to upload stuff on this forum??
I understand the split charge idea when used to charge from the vehicle alternator. I thought HB's idea related to charging both batts from a single solar source. I was wondering how, with the two batteries isolated when the engine isn't running, could both be charged from a single source. If a second split charge relay were used what would trigger it to connect both batts for charging but then isolate them when no charge was available.
Quote: Originally posted by wineciccio on 19/4/2008
Why not use a double pole switch ie, on/off/on re, first position for main vehicle battery middle off of course when engine is running and other position for leisure thats the way a friend wired mine up on a Autotrail Cherokee that i had 7 years ago. I do have the wiring diagram in the house somewhere, if i can find it?, if you wish i can possibly describe it on this forum, unfortunately i still don't know how to upload stuff on this forum??
The only way I know is if its hosted somewhere else and you link to it I think.
I agree the switch is a good cheap and reliable way wineciccio. Trouble is it needs switching and my memory is not improving with age. ;)
not sure any solar panel is any good for anything bar monsters costing hundreds ,a fully charged battery will probably self discharge faster than the small panels can keep it topped up ,theres also the problem with sulphation if the charge is too small.
actually charging a leisure battery is difficult under about 8 amps 16's better due to the internal resistance of the battery itself.
solar electric that really works is a few years away yet.
the output stated in the write ups is probably laboratory results just measuring the output on a meter rather than in actual charging conditions.
we tested quite a few at the uni and none came close to their stated output in "real" conditions but most supplied the output under "no load" conditions.
even those designed for satellites were fairly poor even in the luxery of constant sunshine ,any in england would struggle mainly because we dont have the sunshine the californian makers of a fair number do
13 watts cant even light a bulb never mind charge or maintain a charge at its full capacity in a 120Amp battery
even a large number of trickle chargers on the market struggle with higher capacity batteries
we tried one or two of the compact ones and tested the battery under load (rather than just measuring)and noted the amps supplied ,only a ring 16 amp charger took the battery to its full (or as near as you can get because the capacity is also a laboratory figure) charge.
so whilst the charging device will appear to keep the battery topped up it probably isn't at full capacity
it will though (hopefully) stop it deep cycling down to a voltage only very high voltage at a very small current will get it going again.even dead batteries in a small number of cases can be recovered by "blasting" them with a thousand or so volts at a few miliamps ,as the voltage in the battery rises the voltage is lessened whilst the amps are increased ,we had great fun exploding sealed batteries getting the balance right
now surrey satellites has been sold our R&D maybe curtailed ,ho hum but great fun
to keep a battery charged over winter disconect it from the crude charger in the camper and use a smart charger which will recondition the battery at the same time,most batteries now are sealed versions which are useless in keeping a battery fully charged with a very long life they barely make it past the guarantee period ,maybe a clever ploy by the makers