working with high curent DC

Dwoodsmith

one inch seems a little small to me. Don't forget- heat equates to energy loss. Why not use a 3" pipe and install one of those little computer cooling fans in it. As far as deep cycle batteries, I've heard great things about electric forklift batteries. Also check a company named Sola. Among other things they sell emergency power back-up systems for hospitals and such. That stuff is really expensive, but you can probably find forklift batteries surplus. How about showing us some diagrams?

AllanJ

I'm not sure what the maximum continuous draw from ordinary marine grade deep discharge lead acid batteries is. But the batteries that originally came with the UPS must have deliverd that amperage so the UPS output would be the 120 volts at 1000 VA.

Too much voltage drop in the wires won't in itself cause the battery to explode.

__________________
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.

nap

have you ever seen an electric forklift battery?

this is one battery


Yes, there are some a bit smaller (about 1/3 of the width of that) but most are similar in length and height (about 3 feet). They also weigh a hell of a lot.


finally found some with a person standing next to them

Dwoodsmith

Wow! No chance of overheating that with normal use is there? Ironically,I used to use an electric forklift to load the Sola batteries I mentioned onto trucks. They were much smaller. They were too heavy to pick up, but you could scoot them around on a pallet by hand. It was a lot of years ago, but I remember knowing that I could have bought a real nice barely used car with the cost of each one of them.

Red Squirrel

If I'm going to spend lot of money, I'll just get the one that is actually made for the UPS. :P

So the 1 inch pipe is not enough for venting then? 3 inch seems kinda big, I don't like adding another big hole to the foundation, and another source of heat loss but guess if it's the difference between a hydrogen explosion, and keeping my house, it's a no brainer.

Also is there any method of detecting the presense of hydrogen (other then match lol). This way I can ensure whatever I do for venting is working.

AllanJ

(A little off topic) What you could build is a closet, perhaps at the corner of the basement, with bottom (dip tube) and top vents to the outside and a fan in one vent. The door needs to give a reasonably good seal from the inside. Must have a real ceiling (rocked, taped, mudded, not suspended only) Operating batteries, gasoline cans, etc. could be kept here and the constant exchange of outside air only will minimize heat loss in winter and also keep vapors from reaching explosive proportions.

Non-original batteries are sometimes substituted to give a longer power outage run time than the batteries that came with the UPS.

__________________
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.

oleguy74

what are you powering with all this?

Red Squirrel

I was thinking this too. could allocate a small section of my crawlspace for the batteries. I may add more UPSes and more batteries in the future. One of these would be nice too once I have cash to burn. :P

Red Squirrel

Just a couple servers / network equipment. Keep in mind the batteries will only actually be used if the power goes out. It's not a line interactive UPS.

oleguy74

you might look into a small exauhst fan sys for vent.also use VRLA sealed batteries.or AGM type batteries.VRLA=vent regulated lead acid.AGM=absorbed glass mat.also since you are in canada,call raymond knight.888-214-7774.he deals in battery sys.mostly automotive but might be able to help.he is in brantford,ontario.