1 Reply Latest reply: Jun 18, 2009 9:19 AM by CMFR RSS

Is it possible to use only external batteries on an SUA750XL  ?

vronp Member
Currently Being Moderated
Hi all,

I was recently given an SUA750XL without batteries.

I'm interested in using this device with two car batteries in series. Maybe deep cycle is better, etc. I will have to research that.

What I am wondering about is the wiring connectors on the back on the SUA750XL. I assume they are in series with the internal connectors?

Also, does anyone know where I can buy connectors that will fit the external battery connectors on the back of the unit?

Finally, I assume I will have to program the unit with the new battery info. Any tips?

Thanks all !
  • 1. Re: Is it possible to use only external batteries on an SUA750XL  ?
    CMFR Apprentice
    Currently Being Moderated

    Firstly, be careful when using car batteries as they are often designed for outdoor use and your results may differ from using UPS batteries. Obviously APC can only recommend using official APC RBC's. I have not actually tested this scenario, but I do believe that the UPS will show "battery disconnected' (flashing replace battery LED) if no battery is connected internally. Either way, if you are using a custom external battery setup like that, your runtime will definitely not be estimated properly.

    Unfortunately I can't really provide much advice on this subject as I cannot recommend the use of batteries such as these; we of course haven't tested scenarios such as this.

    Perhaps someone who has tried something like this can comment, and provide suggestions. If there are any specific questions about the UPS, let us know and I'd be happy to help with what I can.


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