SU3000RMXL3U + SUA48XLBP ?

[Anonymous user]

Is it possible to use the SUA48XLBP battery pack with SU3000RMXL3U ups? the UPS has a pair of the blue 120a battery connectors, while the battery pack has one. It appears as though theyre connected internally in the UPS, and its all 48v, so i dont see a problem but I figured i would check here.

[TheNotoriousKMP_apc]

Tony,

The SU3000RMXL3U has 2 connectors for a combined voltage of 48VDC across the two connectors. The SUA48XLBP provides 48VDC on only one connector. You'd essentially end up frying out the UPS by connecting on XLBP to the UPS.

[Anonymous user]

actually that appears to be incorrect. I pulled the cover on the UPS, and here is what i discovered:

One of the rear connectors on the back goes to the battery connector on the front and nowhere else.

The other rear connector goes to the DC bus on the UPS.

The square block that is plugged into the rear of the unit when no external pack is being used connects the front battery connector to the DC bus.

A bit of a strange design, for whatever reason the batteries in the unit are looped through the external battery cabinet when it is in use. This has been changed on the -A revision of this UPS, it has the single connector on the back, and lists the SUA48XLBP as s suitable battery pack.

To use the SUA48XLBP with this SU3000RMXL3U i can either connect the external pack to the appropriate connector on the UPS and not have use of the internal battery pack on the UPS, or make a Y cable (I have the capacity to properly assemble the anderson type battery connectors) to jumper the 2 connectors on the UPS and give me a 3rd port for the SUA48XLBP.

The one thing i didnt check yet was to see if APC changed the polarity on the connectors during the revision, so i need to verify that before I do this. (And yes, i know warranty = gone, im pretty sure the UPS is out of warranty anyways)

[TheNotoriousKMP_apc]

Tony,

We're not required to troubleshoot and know how the internal wiring diagrams are designed - So my apologies on the wrong assumption.

However, with regards to the Polarity on the setup, I nor any other moderator here can provide that information.

Hopefully KVar sees this post (or you can private message him), as he may be of more use to you, as he is a non-APC employee who seems to hold a wealth of knowledge of how the circuitry on our systems work.

[Anonymous user · Accepted solution]

I understand you not being able to provide that information. With regard to the polarity, i am able to confirm that myself (and if i didnt, i would have NO business connecting this as I have stated)

thanks for your help.