Battle Born BB8D

[S_Davis]

I have been trying to figure out what batteries to use on a 2800 watt Outback inverter, I was planning six Lifeline GPL 30HT for a total of 900ah. I started looking a Battle born and think I have decided to go with LiFeP04 batteries, I basically have room for two 8Ds.

This would give me 540ah with two of Battle Borns 270ah BB8D batteries. Probably buy one and see how it works and then another at a later date. Only thing I am worried about is redundancy, I could use six of their 100ah. Opinions?

[theoldwizard1]

S Davis wrote:

time2roll wrote:

S Davis wrote:
Anyone have a reliable source for good cells and BMS?

https://docantech.en.alibaba.com

Ask for Jenny Wu. Shipping top quality EVE280 from Houston TX.


I use this BMS. Limited to 120 amps but very solid reliability.
https://overkillsolar.com/product/bms-120a-4s-lifepo4/

Ordered 12 cells yesterday, should have them in a week or two.

Please follow up on this purchase !

[S_Davis]

time2roll wrote:

S Davis wrote:
Anyone have a reliable source for good cells and BMS?

https://docantech.en.alibaba.com

Ask for Jenny Wu. Shipping top quality EVE280 from Houston TX.


I use this BMS. Limited to 120 amps but very solid reliability.
https://overkillsolar.com/product/bms-120a-4s-lifepo4/

Ordered 12 cells yesterday, should have them in a week or two.

[2oldman]

pianotuna wrote:

for 3000 watts and up it may be a better route to go to a 24 or 48 volt battery bank. It would almost certainly be cheaper, just as a side benefit.

Yeah, the amperages at 12v get pretty insane. Like I always say "wire handles voltage much easier than amperage."

[time2roll]

S Davis wrote:
Anyone have a reliable source for good cells and BMS?

https://docantech.en.alibaba.com

Ask for Jenny Wu. Shipping top quality EVE280 from Houston TX.


I use this BMS. Limited to 120 amps but very solid reliability.
https://overkillsolar.com/product/bms-120a-4s-lifepo4/

[pianotuna]

Hi S Davis,

for 3000 watts and up it may be a better route to go to a 24 or 48 volt battery bank. It would almost certainly be cheaper, just as a side benefit.

[S_Davis]

I will be using the 4/0 DLO cable they sent by mistake rated at 405amps for each 280ah battery.

[S_Davis]

I have decided to build three 280ah lifeP04 batteries, two installed in the truck and one that I can swap between the commercial cap and camper.

[S_Davis]

Itinerant1 wrote:

pianotuna wrote:

Itinerant1 wrote:
What possibly are you going to use to draw over 200a. My microwave draws 148a, 12c coffee pot 84a, air conditioner 150a+. Now if I forget that I'm boondocking and turn the microwave & coffee pot on and other misc items at the same time then it will be 250a +.

Hi Itnerant1,

My microwave draws 176 amps. My air conditioner, on a hot day draws up to 160 amps.

It is not a problem as my inverter tops out at 250 amps (3000 watts), so I can't run 2 major items at once.

That was the point I guess I was trying to say without actually coming out and saying it.

The inverter is going to be the limiting factor and the op said a 2,800w inverter. Heck my batteries will will do 3c continously or 1500a, doesn't do much good if the inverter and other components won't allow it though.

Unless the op might stack two VFXR 2800 watt Outback inverters.

[MEXICOWANDERER]

pianotuna wrote:

2oldman wrote:
Wow.. really? What kind of cable would handle 1500a?

Grounding cable for an airplane.

660 DLO would handle 1,440 amperes with a 40 feet total length. It weighs about 9 pounds per foot, and the image is deceptive the cable has about six thousand strands of tinned cable.

My battery system has 330 cable about half the size but double the size of 4/0

[Itinerant1]

For an off grid home sure. For an rv no sense reinventing the wheel if the wheel already is serving its purpose. Live with in the designed system.

[2oldman]

Itinerant1 wrote:
Exactly....doesn't do much good if the inverter and other components won't allow it though.

That's why you go to a higher voltage.

[pianotuna]

2oldman wrote:
Wow.. really? What kind of cable would handle 1500a?

Grounding cable for an airplane.

[Itinerant1]

2oldman wrote:

Itinerant1 wrote:
batteries will do 3c continously or 1500a, doesn't do much good if the inverter and other components won't allow it though.

Wow.. really? What kind of cable would handle 1500a?

Exactly....doesn't do much good if the inverter and other components won't allow it though.

[2oldman]

Itinerant1 wrote:
batteries will do 3c continously or 1500a, doesn't do much good if the inverter and other components won't allow it though.

Wow.. really? What kind of cable would handle 1500a?