how long did they batteries keep power going on your tank?

I've got a APC Wise-UPS 700VA 120V Battery Backup. The one who been with them before had two MArine grade batteries much like car batteryconnected into it.
Has anybody ever carried this out? And just how lengthy did they keep energy happening your tank? Yes, it is dependent on which was connected however i am curious is employed.
I am certain it might work should you wire the batteries in series. When a no-maintenance battery runs lower a trickle charger, or UPS charger won't bring it well to full charge... Only marine batteries works for APC UPS. It might be a trickle charge though.
FYI, vehicle batteries produce hydrogen gas while being billed, may be a surge problem, be cautious
You are able to most likely estimate your run time knowing your energy draw.
The actual issue is the sturdiness from the UPS. More often than not they aren't created for extended battery some time and do not have cooling fans. Doing something similar to this to 1 with no cooling fan will certainly fry stuff. You could add cooling. Unsure regarding your model but many of the larger models will have fan cooling. I'm speaking in regards to a fan around the actual energy supply not only on the rear of the system.
For those who have more income than time. Just buy which will handle your load and be happy with it.
For those who have additional time than money, you'll have to have patience and learn some fundamentals before you begin hooking up things together. I'd also scavenge the web to determine the number of others attempted exactly the same factor and study from their mistakes. The very best factor that may happen is it works before the UPS quits charging or malfunctions.
Playing with any electricity AC or Electricity could be hazardous for your health discover careful.
It would not hurt to even call APC or other manufacturer and find out just how much info they provides you with on using other stationary battery types.
In the end, they "should" have your safety in your mind