maggyd Posted January 22, 2011 Share Posted January 22, 2011 We have just bought a new B.P.80 Solar panel to charge 2X110 maintenance free batteries . Can anybody advise; 1. What size cable should be used ? 2. Is a fuse required from the live supply to regulater unit . thanks Link to comment Share on other sites More sharing options...
David Dwight Posted January 22, 2011 Share Posted January 22, 2011 Maggie,Check out Sunshine Solar on the internet, you will be able to get the info you want from them, cables and connectors. The web site explains everything.David Link to comment Share on other sites More sharing options...
maggyd Posted January 22, 2011 Author Share Posted January 22, 2011 Thanks David :-D Link to comment Share on other sites More sharing options...
Clive Posted January 22, 2011 Share Posted January 22, 2011 Suggest 0.75 mm sq minimum wire CSA. Many use 2mm sq.The 7.5 amp fuse is to protect the wiring between the regulator and the battery so should be close to the battery end of the cable. c. Link to comment Share on other sites More sharing options...
lennyhb Posted January 22, 2011 Share Posted January 22, 2011 I would use at least 2.5mm sq depends on length of cable run and how much loss you can accept, 3-5% is the norm. I used 3mm sq thin wall auto cable much smaller & easy to run in confined spaces but very stiff. 3mm sq is OK for up to 5m Wire size calculator here: http://www.freesunpower.com/wire_calc.phpAmerican site so wire sizes are swg you need to convert them easy enough with an online calculator. Link to comment Share on other sites More sharing options...
T8LEY Posted January 22, 2011 Share Posted January 22, 2011 If there's one thing that rubs an old cable maker up the wrong way it's referring to cable sizes in mm sq. It's almost as bad as calling lamps bulbs. If you installed very much 3 mm sq cable in your van there soon wouldn't be much room for you. The unit that should be used is sq mm. I think the confusion comes from the other commonly used abreviation mm2, where the number gets replaced by sq when it should be sqd. Why do I feel like everyone's signed off? Link to comment Share on other sites More sharing options...
spospe Posted January 22, 2011 Share Posted January 22, 2011 If you want to use lennyhb's site for calculating wire size, then a good table to convert AWG (American Wire Gauge) to SWG (Standard Wire Gauge) can be found at: http://www.micronradiocontrol.co.uk/wiregauge.html For most purposes there is not a lot in it between the two standards and as SWG (size for size) is of a larger diameter than AWG, you might as well use the same SWG number as the calculated AWG number. Link to comment Share on other sites More sharing options...
maggyd Posted January 23, 2011 Author Share Posted January 23, 2011 John has studied all replies and is taking notes so thanks to everyone. Link to comment Share on other sites More sharing options...
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