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witzend

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Reply with quote  #26 
2 hrs don't seem a lot but inverters take a bit of pwr better if you had a 12v telly really my telly is for 240v but had a transformer in the lead which droped voltage to 12v so I just cut the lead and connected it direct to the battery, How old is the battery if it's been unused for some time it may not be at its best mine started to lose charge after 4 yrs so I replaced them
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Pudsey Bear

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Reply with quote  #27 
I'm not inclined to start cutting leads, 12v TVs still need to be regulated as far as I know.

But this is a 240v TV anyway.

TV data label.

[image] 

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Kev [comp] 

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witzend

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Reply with quote  #28 
TV's can cope with a large difference in voltage your's is regulated to accept voltage anywhere between 100 to 240 ours has been OK for 7 yrs now and many people do the same. To save power you need to keep that inverter switched off as much as possible. How old is the battery ?

Got Mine here         and Here      Used both and been pleased with both I'd recommend Numax sold them for several years and never had any returns 
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primus

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Reply with quote  #29 
I made that mistake years ago left invertor connected to the LBs but turned off on the invertor itself, bloody things still draw some power.
Did not use the van for a few weeks. Result two brand new 100 amp batteries completely knackered.  [mad]
Think Kev is to savvy to not know this. Always disconnect invertor from the batteries when not in use.
Info for anybody new to invertors.

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Primus. [wave]

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trevorf

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Reply with quote  #30 
You need to disconnect the panel from the controller to read the actual panel output voltage "off load". There will be a voltage drop if long thin cables
have been used.
When you fire up the engine then the alternater charges the LB. Thats accounts for the voltage increase.


Trevor


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Pudsey Bear

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Reply with quote  #31 
Maybe I've been lucky, but I've never disconnected my inverters, I usually hard wire them, cable is normally 10mm2 ish so never looked for a switch, never had a problem, although, I do usually have around 375ah of battery bank.

This is the one I've fitted to my last 3 vans, cheap and cheerful.
http://www.maplin.co.uk/p/maplin-12v-modified-sinewave-600w-inverter-a18fg

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Kev [comp] 

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Pudsey Bear

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Reply with quote  #32 
https://www.redarc.com.au/faq-tech-tips/inverter-current-draw
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Kev [comp] 

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Pudsey Bear

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Reply with quote  #33 
Quote:
Originally Posted by trevorf
You need to disconnect the panel from the controller to read the actual panel output voltage "off load". There will be a voltage drop if long thin cables
have been used.
When you fire up the engine then the alternater charges the LB. Thats accounts for the voltage increase.


Trevor



Ah yes, I forgot about disconnecting the panel DOH, I knew all this stuff, but I think the old gray cells are a bit goosed [frown] [frown]  yeah Alternator should kick out around 14v give or take a bit.

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Kev [comp] 

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Pudsey Bear

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Reply with quote  #34 
finally got some sun on the panel, pulled cables and got 20.8v, alternator is giving out 14v +, TV should only be drawing around 10-11 amps, so I should get a lot more than 2 hours.

I've just ordered this one http://www.ebay.co.uk/itm/Premium-Caravan-Marine-Range-125ah-Leisure-Battery-Low-Case-Height-/251855659753?hash=item3aa3c462e9:g:EH8AAOSwRUhY-MRn dimensions fit and it's more AHs so should hopefully be okay.

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Kev [comp] 

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primus

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Reply with quote  #35 
Info I received from Tayna batteries when I tried to claim on the batteries I messed up.

Most invertors draw .5 to 2 amps even when switched off on the invertor rocker switch. To leave permanently connected to the battery bank a double pole isolation switch in the supply cable is a recommended practice to cut off all supply power. A .5 amp draw from a 110 amp battery flattens the battery completely in a week. Causing severe sulphating of the battery plates.

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Pudsey Bear

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Reply with quote  #36 
Which switch did you use John?
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Kev [comp] 

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primus

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Reply with quote  #37 
As I was only using the invertor to charge up my laptop I abandoned the invertor. It was a good time to do this as all the smart phones and tablets where coming onto the market. Lap top now house bound Ipad Air now in the van 2amp charging off the batteries. Invertors only seem any use if you have decent solar panel, Even then the use is limited unless its a massive invertor.
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Pudsey Bear

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Reply with quote  #38 
I prefer to have one as the 12v stuff is becoming harder to find at sensible prices, TVs especially, I refuse to pay for an Avtec, I do have somewhere a 12v adjustable charger for my laptop, but this last trip was the first time I'd taken it with us for years, I'm considering getting a Chromebook for the van, but don't know which one, & not looked into how they charge yet though, not worth buying a full sine wave just for that.

Going back to switching the inverter off, no mention in the instructions of that, (meaning other than the onboard switch) nor the current draw when not in use, and although I've heard the wisdom, it does seem a bit OTT to have a switch on the incoming and output sides.

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Kev [comp] 

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primus

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Reply with quote  #39 
Well you live and learn. It cost me 2 brand new batteries £140. An Iso switch would only have been less than a tenner. Like yours in the invertor instructions I got no mention of its power loss when turned off and still connected. The only way is to have a solar panel returning the power loss on a daily basis so not to discharge the batteries when the van is not used for longish periods.
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Pudsey Bear

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Reply with quote  #40 
Maybe why we've not suffered John, always had a 100w panel, except for first van which only had a 40w one which I found at the side of the road, I only took it to see what it actually was, never seen one before [biggrin]

Which switch did you go for to isolate the inverter from the LBs, a link would help my brain here.

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Kev [comp] 

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primus

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Reply with quote  #41 
Hi Kev. I didn't. See post 37 this topic.
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Pudsey Bear

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Reply with quote  #42 
I misread post 35.
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Kev [comp] 

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Steptoe

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Reply with quote  #43 
Good tip about wiring inverters with an isolating switch, it's never occurred to me to do this though I understand the reasoning.

However to go off-topic regarding motorhomes but on a similar theme, how have others wired up their indoors mains shaving sockets? All my instincts say to put an on/off switch in the circuit but the wiring instructions always show a direct connection to a correctly fused circuit (usually lighting) which is what I do.

AFAIK no professional installations (e.g. in hotels) incorporate an on/off switch so this is obviously acceptable but it somehow seems wrong, like the inverters, to have a transformer permanently live.       

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Pudsey Bear

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Reply with quote  #44 
Not a sparky, but your idea seems to make sense, but there is also the fact it isn't advised, perhaps inserting the shaver plug does something internally.
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Kev [comp] 

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2007 Citroen Relay XLWB self build
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