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Old 04-02-2015, 11:12   #16
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Re: Solar panel Installation and wire sizing from the solar panels to the mppt charge

Quote:
Panel to controller 5.97x 2 = 11.94A
Controller to batteries 435 x 2 / 13 = 66.9A

If we work out the voltage drop with various wires:

Panel to controller
8AWG = 0.90 v
6AWG = 0.57 v
4AWG = 0.36 v

Controller to batteries
4AWG = 0.40 v
3AWG = 0.32 v
2AWG = 0.25 v

Well I would disagree , but essentially your doing what I said

Firstly if there is a short in the panel assy. The panel is theoretically capable of 6.43x2 , 13 amps, and I would size the mppt input wires as such

from the mppt to the battery, 435 x2 = 870 watts and in bulk you would anything down to 11.5V, so 75 amps which is the rated max output of the controller.

Hence i would size for those currents would be AWG #3 for about 2% drop round trip.

and #10 for the panel to mppt for a 1% drop

it would be unwise to size to less then max panel current IMHO
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Old 08-02-2015, 14:24   #17
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Re: Solar panel Installation and wire sizing from the solar panels to the mppt charge

I want to thank all who have contributed to this post.

I'm now waiting for confirmation from the charge controller mfgr regarding the max voltage of the panels vs the total volts of their charger before I purchase it.

Here's a picture of the solar panel installation on the new hardtop made specifically for the panels at a cost of about US$250.00 on top of the existing cockpit cover stainless steel bows

Fair winds,
Jim
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Old 08-02-2015, 19:25   #18
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Re: Solar panel Installation and wire sizing from the solar panels to the mppt charge

use MC4 extension wire from your connectors comes in lengths 10 ft to 100 ft to your controller from controller to batteries use #4. solarsam
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