3 Lynx Power In for 12 parallel 100amp hour Battleborn batteries

I'm rewiring my setup my RV. Current system is 12volt, 2 Multiplus II's, 2,900 watts of solar and 8 100amp hour Battleborn batteries. Yes a bit large for 12 volt. I should have opted for 24v when I added the second multi and 4 additional batteries.

Previously I had 8 batteries and were wired diagonally with 2/0 cables. I've added 4 more batteries for a total of 12 and I've purchased Lynx Power Ins and Lynx Distributors and Lynx Shunt.

I will have the following setup. Lynx Distributor + Lynx Distributor + Lynx Shunt + Lynx Power In + Lynx Power In + Lynx Power In. I don't want to wire this many batteries diagonally.

I'll have each battery wired directly to the Lynx Power Ins. My question is will the length of the Lynx Power In (x3) busbar (about 30 inches) affect the battery balance. Meaning although I have each cable exactly the same length but this doesn't count where they are on the busbar. Am I over thinking this or will it be fine since these busbars are big?

Each Power In has 4 connections, are you using one connection to each battery? You could so easily get away with 4 batteries diagonally connected , for a total of 3 battery connections on one power in.

What’s the average load those multiplus are carrying? Figure what 500a max? That’s no where near the 1000a rating of the bus bars.

740GLE said:

Each Power In has 4 connections, are you using one connection to each battery? You could so easily get away with 4 batteries diagonally connected , for a total of 3 battery connections on one power in.

What’s the average load those multiplus are carrying? Figure what 500a max? That’s no where near the 1000a rating of the bus bars.

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Yes each battery will have its own connection to the busbar and just under 500a at max capacity. I want this so I can isolate each battery periodically and check it. I've just recently had to get the original 8 replaced under warranty.

Do you know if the length of the busbar will noticeably affect the voltage and draw from the batteries?

You probably already know but have the same length cables for each battery. I don’t think having the three bus bars will increase the resistance any, but you could test it.

Put the battery cables in position #1 and test the resistance, then test the resistance in position #12 and position #6.

There are people here much more knowledgeable than me - maybe there is a better test?

What were the issues you had with the original 8 that caused BB to replace them under warranty?

I'd like to see a schematic of how you hooked up your 8 batteries and what you plan on for the 12. I'm not sure what you mean by Diagonal. The Lynx:



This diagram does not show fusing, but here are some examples of how I'd wire them:

740GLE said:

What were the issues you had with the original 8 that caused BB to replace them under warranty?

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Low voltage was the symptom with everything hooked up. This happened over time, when installed it worked fine for over a year. When I tested each battery for Battleborn, some would not wake up no matter how long I charged them, some would discharge 100 amp hours but wouldn't charge correctly, meaning I would have to lower the charge current down to like 7amps for it to fully charge. If I charged these at 15 or 30amps the voltage would jump quickly and the charger would go into float prematurely. Some would charge seemingly fine but their resting voltage was around 12.5v.

chrisski said:

I'd like to see a schematic of how you hooked up your 8 batteries and what you plan on for the 12. I'm not sure what you mean by Diagonal. The Lynx:

View attachment 193548

This diagram does not show fusing, but here are some examples of how I'd wire them:

View attachment 193540
View attachment 193544

Click to expand...

Here from the Wiring Unlimited is what Diagonally is. Previously 8 batteries were connected this way. Now I have 12 and will connect them individually and directly to 3 lynx power ins.

jasonandress said:

Low voltage was the symptom with everything hooked up. This happened over time, when installed it worked fine for over a year. When I tested each battery for Battleborn, some would not wake up no matter how long I charged them, some would discharge 100 amp hours but wouldn't charge correctly, meaning I would have to lower the charge current down to like 7amps for it to fully charge. If I charged these at 15 or 30amps the voltage would jump quickly and the charger would go into float prematurely. Some would charge seemingly fine but their resting voltage was around 12.5v.

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This is a mobile application right? Those batteries are secured agains movement right?

I’ve heard of some issues with the BB terminals moving around and a possible design issue other picked up on. I wonder if you’ll still have issues with your new units.

As for the length of the Lynx “human centipede” you’ll have concocted, I would t worry about it beyond making sure each connection is clean and tight. Voltage drop should be minimal.

I have no idea but would be possible or helpful to connect your plus and minus "diagonally to your train of lynx's and shunt?

jasonandress said:

View attachment 193592
Here from the Wiring Unlimited is what Diagonally is. Previously 8 batteries were connected this way. Now I have 12 and will connect them individually and directly to 3 lynx power ins.

Click to expand...

There is some math in my signature block that tells you exactly how much those batteries are being worked or overworked. IMO, busbars are best.

The power ins connected should function as one

Gonna be a nice set up having all batteries direct!

740GLE said:

This is a mobile application right? Those batteries are secured agains movement right?

I’ve heard of some issues with the BB terminals moving around and a possible design issue other picked up on. I wonder if you’ll still have issues with your new units.

As for the length of the Lynx “human centipede” you’ll have concocted, I would t worry about it beyond making sure each connection is clean and tight. Voltage drop should be minimal.

Click to expand...

Thanks for the tip. Yes buttoned down really well.