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The volt drop works on the 15m, not both ways, but if you all want to do 30 meters then thats fine as you are just doubling the run and adding a safety factor !

From your data Current = 6 Amps Length = 15m Looking at my tri rated tables (other cable may be slightly different) 4mm2 is 5.7mV/A/m So VD (Volt Drop) for 4mm2 cable = ( 5.7 x 6 x 15 ) / 1000 = 0.513 V Taking a 12V supply that is 4.25% ((VD x 100 / 12)) 6mm2 = 3.3mV/A/m So Volt Drop for 6mm2 cable = ( 3.3 x 6 x 15 ) / 1000 = 0.297 V Taking a 12V supply that is 2.48% 10mm2 = 2.2mV/A/m So Volt Drop for 10mm2 cable = ( 2.2 x 6 x 15 ) / 1000 = 0.198 V Taking a 12V supply that is 1.65%

Where abouts on the oxford ?

I missed all boats moored and cruising Didnt go far though

Started out today, wind was really high, was like trying to canoe sideways ! And went round a couple of rather tight bends where the canal was narrow and low and behold 4 or 5 boats moored on the towpath on the bend (Not holiday boats either), was pretty difficult getting round in the wind, perhaps they don't read this or know the untold rules..... Common sense and all that

Bump

Remember to work out the circuits overcurrent protective device settings (OCPD) make sure you take into account relevant factors, e.g a 2.5 ring final circuit (2 x 2.5mm2) in a house may have to be downrated to 25 or 20 amps due to various de-ratings like bunching, thermal constraints etc. These are all in the tables along with the formulas in BS7671, although not sure if these need to be complied with on a boat (although it would be best practice)

And check out canal route planner Ideal to see how far or not you will get and how many hours a day cruising you need http://canalplan.org.uk/cgi-bin/canal.cgi

Im leaving Napton around 12ish saturday.....

Thanks for all the advice, one question as it school holidays will all the canals be busy or would say the birmingham ring be less busy than going down to oxford from napton ? Also can you moor up anywhere on the canal for the night or do you need to pick a special place - 24/48 hr mooring etc ?

It does - If the panels are getting different levels of light on them then the shaded panels will drag down the sunny panels (in simplistic terms), all panels should face the same way and at the same angle, unless you have separate MPPT trackers for each set or you have an MPPT tracker that has special characteristics to cope with shaded panels - although i don't know if they do these on the MPPT trackers talked about here.

Yes temperature is a factor, if your interested ill post the formula - the hotter the temperature the worse the output, the lower the temperature the higher the output (and voltage)

Depends on the phone but i use a life proof case for my iPhone for work as its totally waterproof, they then also do a float for this so your phone will float if dropped into water http://www.lifeproof.com/shop/wo_en/lifeproof-lifejacket/?___store=wo_en

Dates are not during the Cropredy Festival so is it worth going to Cropredy as well ?

Thanks, that sounds good, whats a 7 day mooring ?

Sorry about that 2 adults and for a few days 3 adults, 4 kids 9,10,10 and 11 Cruising average 6 hours a day, stop for lunches - ideally planning an 11 day trip with 2 days in hand for either bad weather or days where we don't go far More towards country but not desolate and small towns and good pubs

Hi Going on a 13 day cruise out of (and back to) Wigrams Marina (Napton Junction) What routes would you consider ? Whys ? Wherefores ? Any problems or highlights ? Have various children with us as well

And if there is an earth fault you'll be dead in some circumstances.

The panels will (probably be series) So Panel 1 + goes to Panel 2 - Then Panel 2 + goes to Panel 3 - Now you have Panel 1- and Panel 3 + left - These are the +'ve and -'ve of the series array These 2 will go to your charge / inverter etc ? This will be the other 2 cables you have with only one connector on each end The Pos(+) and Neg (-) on each panel if MC3 or MC4 connectors will be male / females so you shouldn't get these wrong PS I'm taking a calculated guess as i don't really know what 3 panel kit you have.......

And apart from the HV there are no other LV supplies in the near vicinity ? Overheads ? Undergrounds ?