How big XS battery for SAZ-1500D?

[timma100]

Setting up my 1500D at 1 ohm in a couple of months, looking to add a second battery from XS power. But I don't know what size would be best, seeing how expensive they are overdoing it isn't really a good solution

[Nut Hair Trick]

This chart will give you a good idea of what you might need. Of course you will need to upgrade your grounds with the big 3 and take the size of your stock alt in consideration.

[Nut Hair Trick]

It shows watts as primary battery if you want to just upgrade the battery under the hood, or watts as secondary battery for a second battery in the back. My question with this is, If I were to upgrade the battery under the hood, and add a second battery to the back, would the capacity be doubled? or maybe 1.5 times that of the second battery rating? Surely there would be more power on tap. And I know folks will come in here talking about how I would need to upgrade my alternator. But, there is proof out there with people doing this without the alt upgrade and being just fine.

[CAT MAN]

It shows watts as primary battery if you want to just upgrade the battery under the hood, or watts as secondary battery for a second battery in the back. My question with this is, If I were to upgrade the battery under the hood, and add a second battery to the back, would the capacity be doubled? or maybe 1.5 times that of the second battery rating? Surely there would be more power on tap. And I know folks will come in here talking about how I would need to upgrade my alternator. But, there is proof out there with people doing this without the alt upgrade and being just fine.

beat me to it