I'm trying to make a portable solar power bank with a 100 watt renogy panel, a 20 amp PWM controller, and a deep cycle battery from my boat to charge gps, headlamps, and power a quad band radio when needed. I understand figuring out gauge size for panels to charge controller but I can't seem to find a clear explanation of wire size between battery and charge controller. The battery will be right next to charge controller and panel up to 20ft away.
From what I gather from the calculators I should be ok with 20ft of 12 awg wire from panel to controller. I think 12 awg should be fine for controller to battery. I will be running an old maxx 400 watt inverter just to charge some devices that only have AC. Am I right to make the battery to controller calculatiion based on the max draw from the load side? I'm a little confused because some battery chargers with alligator clips only have tiny wires and they charge fine and some people say to get huge wires just like a vehicle uses which don't even look like they fit into the 20amp controller I'm looking at on amazon.
I already ordered a 20awg panel mount sae outlet for a box and and some 12awg sae connectors to use inside the box to easily disconnect components. Now I'm wondering if 12awg was enough and also if sae was a good idea because they aren't that cheap and not easy to find stuff like sae panel mounts.
I'd appreciate some help.
From what I gather from the calculators I should be ok with 20ft of 12 awg wire from panel to controller. I think 12 awg should be fine for controller to battery. I will be running an old maxx 400 watt inverter just to charge some devices that only have AC. Am I right to make the battery to controller calculatiion based on the max draw from the load side? I'm a little confused because some battery chargers with alligator clips only have tiny wires and they charge fine and some people say to get huge wires just like a vehicle uses which don't even look like they fit into the 20amp controller I'm looking at on amazon.
I already ordered a 20awg panel mount sae outlet for a box and and some 12awg sae connectors to use inside the box to easily disconnect components. Now I'm wondering if 12awg was enough and also if sae was a good idea because they aren't that cheap and not easy to find stuff like sae panel mounts.
I'd appreciate some help.
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