I’m looking for any single cable or combination of cables that I can use to connect my AC200Max to by B500K battery. I have the cable that it comes with, there are no issues with its functionality with the power station
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BUT…
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I do not like its length and I do not like that I have to have the B500K either next to or underneath (and backwards!) my AC200Max.
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So, are there any other non-standard cables (even if I have to buy two an plug them together!?) that will solve my problem?
If all else fails I am going to buy a 2nd P090A cable, cut it in half and splice my own wires to increase its length! (Yes, I know what I’m doing.)
But it shouldn’t come down to this.
Also (see picture) I have asked if it is okay to mount my B500K in a non-upright position via email, but I was told that I can not.
I still find it odd that in a stationary application (going in a cabin and not a mobile application such as an RV) that there would be that much stress placed on the battery cells by the unit being with the mounting holes mounted vertically rather than horizontally.
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Can someone from @BLUETTI chime in here and for sure confirm that the below mounting method would not be acceptable?
And also chime in on the cable connections as well?
Does anyone know what type of port the battery expansion port actually is?
Is it proprietary between models?
I know that placement, location and orientation is not the same on different power stations, but how about the physical connector?
And are they wired differently on each unit?
I just looked and the AC200Max and the B5500k share the same exact port.
Good question. I’d thought that as long as every additional cable connecting batteries was the same length it would not matter although the shorter the better.
My question is with the Apex 300 and the CA90 (10.6" - 270mm) cable versus the P090A 31.49" - 800mm).
The P090A cable connects the Apex 300 to the B500k but the literature suggests to use only the CA90 cable for the connection which is entirely too short for the application. Is it forbidden to use the P09A cable to connect the Apex 300 to the B500K?
@Andrewr05 how much did you extend the CA90 by? Do you have any pictures / details of the wires inside?
I’m going to have to do the same and I assume there will be a mix of wire gauges inside?
Your AC200MAX is working at 48 V nominal delivering approximately 2 kW on the AC side, in this condition the DC current demand can reach significant levels. Assuming typical inverter efficiency, the current on the DC side can easily approach or exceed 45-55 A under nominal load, with transient peaks potentially rising well above 70–80 A depending on startup conditions and load surges.
That’s why from an electrical and installation standpoint, extending the battery cable is not recommended in this application.
At these current levels, cable length becomes a critical parameter in addition to conductor cross-section. Increasing the cable length without proper recalculation of voltage drop and thermal limits can lead to excessive losses, undervoltage conditions at the inverter terminals, and potential overheating. Therefore, both cable sizing and total length must be carefully evaluated together, and extending the cable arbitrarily is not advisable.
Also please note that the battery cable assembly integrates not only power conductors but also CAN bus communication lines. Interrupting and reconnecting these conductors introduces impedance discontinuities and potential noise pickup, all of which can compromise communication integrity. This may result in unstable or lost communication between the B500K battery and your AC200MAX, leading to faults or improper system operation.
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Regarding the battery installation your B500K is composed of prismatic cells, which contain electrolyte, internal plates, and a gas (air) volume. These cells are designed to operate with a specific orientation to ensure that the electrode plates remain properly immersed in the electrolyte. This immersion is necessary to maintain correct electrochemical operation through capillary wetting of the plates.
Mounting the battery in an improper or random orientation can lead to partial exposure of the plates, resulting in reduced performance, uneven degradation, and possible long-term damage to the cells.
