The BBGC3 is a 270Ah 12V LiFePO4 deep cycle battery in a unique battery case and shape that is changing the way batteries can be placed inside RV’s. If my initial response gave that impression to the OP, I apologize.not my intent.We’re changing the game with this new 12V LiFePO4 deep cycle battery. There's not a "one size fits all" answer. The point (and well made, Jim) is that each setup must be evaluated and wired based on it's configuration and capability. The same battery and inverter setup that is 12" apart will likely use a different wire from one that has the battery and inverter 50' from each other!
Length of the wire used is a critical criteria, too. This configuration (number of batteries, wiring, and inverter) is not ideal. That's just over (or right at) the 2/0 wire maximum specification. The Battle Borns and (Victron) inverter will do it-for a short time-thus the wires could experience 190 amps. The user inadvertently puts the inverter into an overload condition drawing 390 amps from the battery bank, which is just below the 400A fuse threshold. One more example to drive home the point: an individual puts two 100aH batteries in parallel and connects to a 3000W inverter. Heads are probably spinning right now with all the math-but again-the point is each configuration must be analyzed and configured as you noted for the maximum draw the circuit could experience before the safety device kicks in (aka "fuse"). Even if I "only" had three 100aH batteries (the minimum battery configuration suggested tied to a 3000W inverter) 2/0 would "work" since the maximum any single 2/0 (connected to a single battery) will experience (before the fuse blows) is about 133 amps. Given the 400 amp fuse protecting the circuit in my camper, that's the maximum amperage it should experience. Based on charts I find online, this is under the max of ~175 amps the 2/0 can handle. In the unlikely scenario the Multiplus pulls 500 amps for 1 second (or until the 400 amp fuse blows), the maximum draw from each of my four Battle Born batteries will be 125 amps (500/4). JimThat would mean I was pulling 800 amps from my four battery setup.if that was happening something's cooking. The wiring should be sized for 200 amps if there is a possibility of a draw that high. Howard - The maximum discharge for Battle Born batteries is 100 amps continuous, 200 amps for 30 seconds and higher loads for ½ second.
#Battleborn gc3 manual
I remember my Magnum inverter manual was very clear that the interconnecting wiring had to be the same size, but that wouldn’t take into account the BMS protecting. Surge can be up to 500! (The Battle Borns and Victron will do it-but only for about a second and then will say "No Mas!") That’s true I forgot the battleborn batteries would limit the current so that would protect the wiring.
The 4/0 from where the batteries come together to the inverter is because with four batteries and a 3000AH inverter the sustained amperage is 250. Surge can be up to 500! (The Battle Borns and Victron will do it-but only for about a second and then will say "No Mas!") Put a few of those together in parallel and you could light up a small city. Obviously if using batteries like bertschb's new 270aH BB battery (capable of 300amps output?), that would be a different story. 2/0 is more than sufficient especially with the very short lengths I'm using. Interconnect between the batteries is 2/0 as the maximum sustainable amperage a Battle Born (BB) 100aH will output (or input) is 100 amps.
That's not how Garret Towne configured my system, Neil. If your 4/0 is overkill, you’re probably fine, but I think you normally want them the same. The idea being as I understand it is the power going out to the inverter in your case could be traveling on the 4/0 to the first battery and then on 2/0 to the next battery (it should be split, but wire sizing is worst case). I could be wrong but I think when the batteries are wired in parallel you want the interconnecting wiring to be the same size as the largest feed leaving the bank.
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