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Old 04-20-2019, 03:15 PM   #1
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Looking for cables for the battery to inverter. 4/0 is recommended. I'm only finding it in the $8+/ft range. I guess I need to keep that inverter as close to the batteries as possible. Anyone know of a inexpensive source for cabling?
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Old 04-20-2019, 03:32 PM   #2
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4/0?

Holy cow, what kind of inverter and battery bank are you running?

Mine calls for a minimum of 6ga. for a 2% or less voltage drop under full load.

I plan on going 4ga. To give me some headroom.

Here is a wire sizing calculator: https://www.wirebarn.com/Wire-Calculator-_ep_41.html

I would double check the requirements for wire size before spending $8 a foot.

Edit: You definitely do not want to undersize your wiring. That said, there is no reason to pay for 4/0 when a less expensive (smaller) MAY work just as well.
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Old 04-20-2019, 03:39 PM   #3
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4/0?

Holy cow, what kind of inverter and battery bank are you running?

Mine calls for a minimum of 6ga. for a 2% or less voltage drop under full load.

I plan on going 4ga. To give me some headroom.

Here is a wire sizing calculator: https://www.wirebarn.com/Wire-Calculator-_ep_41.html

I would double check the requirements for wire size before spending $8 a foot.

Edit: You definitely do not want to undersize your wiring. That said, there is no reason to pay for 4/0 when a less expensive (smaller) MAY work just as well.
I checked several sites specifically on what size wire from the battery to the inverter, all of them say 4/0.
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Old 04-20-2019, 03:42 PM   #4
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Originally Posted by PNW_Steve View Post
4/0?

Holy cow, what kind of inverter and battery bank are you running?

Mine calls for a minimum of 6ga. for a 2% or less voltage drop under full load.

I plan on going 4ga. To give me some headroom.

Here is a wire sizing calculator: https://www.wirebarn.com/Wire-Calculator-_ep_41.html

I would double check the requirements for wire size before spending $8 a foot.

Edit: You definitely do not want to undersize your wiring. That said, there is no reason to pay for 4/0 when a less expensive (smaller) MAY work just as well.
I checked several sites specifically on what size wire from the battery to the inverter, all of them say 4/0.
I have a 3000/6000watt inverter, but will probably use the 3500/7000 one I took out of the TC2000.
Just found some on Amazon for around $4.50
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Old 04-20-2019, 04:08 PM   #5
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Originally Posted by o1marc View Post
I checked several sites specifically on what size wire from the battery to the inverter, all of them say 4/0.
I have a 3000/6000watt inverter, but will probably use the 3500/7000 one I took out of the TC2000.
Just found some on Amazon for around $4.50
That is a monster inverter. What do you have for batteries, charger and solar do you have backing that up?

When I documented my loads I found that an 1800 watt inverter was plenty. I have a Xantrex 1800 that will surge to 2900. It draws 75 amps at rated max and about 120 amps at Max surge.

Regarding the wire on Amazon: be careful that it is not copper plated aluminum. I almost ordered some thinking that I was getting a bargain. A little research made it clear that this was not the all copper, high strand count that I want for my battery cables.
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Old 04-20-2019, 04:23 PM   #6
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Originally Posted by PNW_Steve View Post
That is a monster inverter. What do you have for batteries, charger and solar do you have backing that up?

When I documented my loads I found that an 1800 watt inverter was plenty. I have a Xantrex 1800 that will surge to 2900. It draws 75 amps at rated max and about 120 amps at Max surge.

Regarding the wire on Amazon: be careful that it is not copper plated aluminum. I almost ordered some thinking that I was getting a bargain. A little research made it clear that this was not the all copper, high strand count that I want for my battery cables.
It's copper.

https://www.amazon.com/TEMCo-WC0341-...202739518&th=1
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Old 04-20-2019, 07:16 PM   #7
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High ampacity cabling of that capacity is indeed very expensive.

Use Blue Sea' Circuit Wizard to check if you really need as thick as you think you do.

That is very thick, I've had to use it, but rarely more than 30' at a time.

If you're going to spend big bucks anyway, use the good stuff, especially if exposed to harsh conditions

UL1426 105c tinned "boat cable", type 3.

Ancor is well known but over priced

EPM makers of Deka

Pacer

also Berkshire Wire in Western MA, call for nearby distribution

but lots of counterfeiting of all this stuff going through Amazon markets, eBay etc.

Known-good marine supply houses are best to avoid that.

http://www.bestboatwire.com is great, and use their sister co genuinedealz.com for cut to length & custom terminated, top work very reasonable.

Avoid Cobra

You also need to be picky to get quality termination supplies, FTZ and Ancor are great

The right crimpers are expensive! Maybe see if you can find them to borrow (West Marine, local marina / boatyard) or rent, then buy the fittings to match the crimpers available that way.
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Old 04-20-2019, 11:08 PM   #8
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When I check converter sizing they always talk about making the list of usage of everything in the bus to see total need, then add 10-20% to the size of the inverter to be sure it is big enough. Question is- can you go too big on the inverter, or is it's output still determined by the battery bank and usage?
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Old 04-21-2019, 12:31 AM   #9
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Originally Posted by o1marc View Post
When I check converter sizing they always talk about making the list of usage of everything in the bus to see total need, then add 10-20% to the size of the inverter to be sure it is big enough. Question is- can you go too big on the inverter, or is it's output still determined by the battery bank and usage?

The A.C. load generally determines the inverter max output needed. It is always better to have more inversion capability than needed, but not extremely more.



I also have a 3000W/6000W inverter/converter and it specifies 4/0 cable. However, you can run two strands of 2/0 and have an equivalent of 5/0 ... a touch of safety margin and the cables are easier to manipulate. Even 2/0 is tough ... I could not imagine 4/0!
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Old 04-21-2019, 01:05 AM   #10
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The inverter had wires coming up through the floor at the battery box that were about 4" long and at least 3/4" thick. I haven't been able to get into the battery box as the seller has not sent me the extra keys he has. I need to remove the 2 house batteries and cables to the inverter. I may have the bus sold tomorrow, so I will take the 5/16" tech screws off the hinge end of the battery door tomorrow and get them out. Hope the seller doesn't stiff me on the keys and remote for the inverter.
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