how many watts can a Deka 9a78dt do as the only battery?

[HvNd4Speed 10+ year member]

I sold my Tahoe and I kept the Deka 9A78DT battery to use for my next install. I also bought a Deka factory second group 31 battery that DBeez sells here from time to time, been a great battery but I am not doing a big system like I did in my Tahoe.

Do any of you know if the Deka 9a78DT under the hood could handle running a JL 1000 and a JL 300/4, Im in a Honda Element now, alternator is stock and the big 3 is almost not an option due to placement of the alternator, its virtually right next to the header.

Im not sure if the Deka will even fit under the hood, if not, what are some other good batteries that can run around 1300 watts as the only battery and stock alternator?

Thanks for any help guys! If these Dekas won't work, they'll be up for sale soon.

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