chrisarvor
New member
what size cable do i use from the batteries to the invertor
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what sixe leads to 1500w invertor
- Thread starter chrisarvor
- Start date
Talbot
Active member
size to an extent will depend on how close the inverter is to the batteries, but should be at least 30 sq mm cross section (i.e. decent starter cable dimensions) with an adequate fuse in the circuit - talk to Index.
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Jcorstorphine
Well-known member
Not sure how efficient your inverter is but if you assume that your 1500 watt inverter is running from 12 volts then the input current will be in the region of 125 to 140 amps (ish)
From memory, the tables state that 500 amps requires 185 mm2 so I think that you can safely say that for a load of 125 then you should be looking at 50 mm2. If you are running from 24 volt supply, the current will be roughly half so you can also half the cross section.
I would double check with the suppliers, do they not give a recommendation as to primary cable sizes?
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From memory, the tables state that 500 amps requires 185 mm2 so I think that you can safely say that for a load of 125 then you should be looking at 50 mm2. If you are running from 24 volt supply, the current will be roughly half so you can also half the cross section.
I would double check with the suppliers, do they not give a recommendation as to primary cable sizes?
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andyball
New member
depends how long they are....keep as short as poss.
1500W output at say 90% efficiency will need say 140A at 12V (assuming it's a 12V inverter ?).
Some are rather less efficient, & some can manage an output of double or more the stated for short periods, so if you might use that...allow for greater current.
Volt drop will be approx. (.0164 x current x length of cable) all divided by cross sectional area of cable in mm2.
length of cable is both & - conductors, ie 2 x the distance from the battery.
Although inverters cope quite well with low input voltage; I would try to keep the drop under 0.5V & as low as possible.
with inverters there's often a practical limit to the size cable that the terminals will take, which may be less than you'd like, esp if a long cable run
1500W output at say 90% efficiency will need say 140A at 12V (assuming it's a 12V inverter ?).
Some are rather less efficient, & some can manage an output of double or more the stated for short periods, so if you might use that...allow for greater current.
Volt drop will be approx. (.0164 x current x length of cable) all divided by cross sectional area of cable in mm2.
length of cable is both & - conductors, ie 2 x the distance from the battery.
Although inverters cope quite well with low input voltage; I would try to keep the drop under 0.5V & as low as possible.
with inverters there's often a practical limit to the size cable that the terminals will take, which may be less than you'd like, esp if a long cable run
abraxus
New member
It depends on the length of the wire run.
Here's a link to a wire sizing chart. Note that distances used are rounf trip distances so 12ft for example means a distance of 6ft bewteen the battery and inverter.
http://mastercatalog04.westmarine.com/0660.asp
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Here's a link to a wire sizing chart. Note that distances used are rounf trip distances so 12ft for example means a distance of 6ft bewteen the battery and inverter.
http://mastercatalog04.westmarine.com/0660.asp
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paulburton44
New member
is your invertor 1500w peak or continuous ????????
<hr width=100% size=1>www.withamsailingclub.co.uk
<hr width=100% size=1>www.withamsailingclub.co.uk