electrical questions.

Jan 25, 2004 10 Replies

OK, I have my 65 amp alternator fitted and working and a big 'ole battery too. Now I have the leisure battery that came with the Land Rover, handy as I needed one for 'other stuff'.



Question 1. I need a split charger, something that will wait for the main battery to be fullly charged then will charge the 'leisure' battery, where do I find such a thing, cheap? (I can build boards from kits).



Question 2, I have an old filter coffee maker, it draws 900W at mains voltage, is there such a thing as an inverter that can supply such current?



Question 3, the 'nominal capacity' of my leisure battery is 90Ah, is this enough to make coffee a la question 2? (needs to supply for around 10-15 minutes).


-- Regards. Mark.(AKA, Mr.Nice.) ___________________________________________________________ "To know the character of a man, give him anonymity" - Mr.Nice.

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I don't think this is particularly expensive. Do a Google for 'caravan supplies' or summat similar.

Yes, but they get bigger and more expensive as you up the ante. They also kick out a fair bit of heat themselves I think. Martyn may have more experience of this than I do.

Maplin stock them, as do Machine Mart, so you should get specs from either site. A 12V coffee maker would be cheaper!

900W at 12V is about 100 amps, give or take (accounting for some losses in the inverter as well). So you'll use about a quarter of the battery (very rough calculations, YMMV).

Mark - search maplin.co.uk for 'split charge'. They do a single module for £8.

Cheers

yes, but probably cheaper to buy a 12v coffee maker

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Twas Sun, 25 Jan 2004 16:29:55 +0000 when Denis F put finger to keyboard producing:

The link didn't work but I like the website, My wife is gonna hate you for this, I'm going to buy all kinds of stuff from here.

-- Regards. Mark.(AKA, Mr.Nice.) ___________________________________________________________ "To know the character of a man, give him anonymity" - Mr.Nice.

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mrniceATmrnice.me.uk
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110 CSW 2.5(na)D___________________________________________________________

didn't work when I clicked it either! but it's whats in the address bar of I Exploder when I go to the inverters page

anyway coffee machines are 25-50 squid - inverters are £200-£500+ for

900 watts +

It's an ASP site (badly error trapped and running an MS Access database at a guess). So the required data isn't in the URL.

Go to the site and search for "coffee maker".

Generally available - but not cheap - although that depends on what you call cheap.

Yes - but a new 12 coffee maker would be a LOT cheaper - and smaller.

The capacity is enough - but the maximum advisable current from the battery is probably not, depending on the type of battery. A 900w inverter will draw something close to 100A, but if it is a deep cycle battery this is probably about five times the maximum current draw for long life. A starting type of battery would be OK, but the depth of discharge will be getting rather high for one of these. JD

Any auto-electrical place will have them.

Richard

For question 1, speak to this guy, he supplied me with a very good voltage sensitive relay for just this purpose. Not too expensive either!

Tony M Towbars & Trailers Chesterfield Specialists in Towing Equipment NTTA Council Member

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accredited for Towbars and Trailers No affiliation other than a satisfied customer.

Neil

Twas Mon, 26 Jan 2004 01:38:39 +0000 when HN put finger to keyboard producing:

Thanks ;o)

-- Regards. Mark.(AKA, Mr.Nice.) ___________________________________________________________ "To know the character of a man, give him anonymity" - Mr.Nice.

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mrniceATmrnice.me.uk
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110 CSW 2.5(na)D___________________________________________________________

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