if you were buying a couple of 6 volt batts

ws9876

for a 300 watt backup inverter setup 12v .....what would you buy ...???and if you lived in MT/Wy
(shipping)???

Kamala

Re: if you were buying a couple of 6 volt batts

Depends on the number of hours you expect the inverter to deliver power to an, as yet, unspecified load.

Not knowing the exact requirement/expectation, I'll suggest a single 100AH 12v battery. Maybe run a small TV and a light for a few hours.

mike95490

Re: if you were buying a couple of 6 volt batts

What do you plan to run with it, and recharge it with ?

icarus

Re: if you were buying a couple of 6 volt batts

Not to be repetitive, but tell us your loads.

Suggesting a battery with out knowing the loads is like,, well you know, make up your own analogy!

Tony

ws9876

Re: if you were buying a couple of 6 volt batts

it will run 2 lights cf
1 TV 100 watts
and 1 laptop using 15 watts
for about 1-2 days

I am thinking AGM

Cariboocoot

Re: if you were buying a couple of 6 volt batts

ws9876 wrote: »

it will run 2 lights cf
1 TV 100 watts
and 1 laptop using 15 watts
for about 1-2 days

I am thinking AGM

Uh, it's more like this:

2 13W CFL's - for how long per day?
1 100W TV - for how long per day?
1 15 W Laptop - for how long per day?

Otherwise you're trying to calculate without necessary info; the actual hours use per day. You might end up with 141 Watts * 24 hours = 3.3 kW hours, which is unlikely to be what you actually need because you won't be running everything continuously all day.

I would not by AGM type batteries unless you need the "safety" factor of the sealed units. Why? Because this is a first system and mistakes are likely to be made. Standard FLA deep cycles (like golf cart batteries) are more "forgiving" of mistakes and don't cost as much per Amp hour.

cfcw

Re: if you were buying a couple of 6 volt batts

I bought my golf cart batteries at the local Sam's club. Costco also has them. They are about $75.00 each

icarus

Re: if you were buying a couple of 6 volt batts

2 15 watt cfl for 2 hours = 60 watt/hours (wh)
100 watt TV for 2 hours= 200 wh
Laptop 15 watts for 2 hours= 30 wh. (Does it only draw 15 watts?)

Total load 290 wh/day, assuming your figures are correct.

290 wh= ~ 23 amp hours @ 12 vdc

If you only wish to draw your battery down 25%, you should look for a battery in the 100ah range. A pair of golf cart batteries would be about 250 ah.

That said, I think you are underestimating your loads. I suspect that your Lap top draws closer to 60 watts, and the TV might be closer to 150. Do you have a Kill-a-watt meter to confirm your loads?

Tony

PS I don't know too much about AGMs, but consider the price comparison carefully given what you expect to do with them. I also suggest you read the following links.
http://www.windsun.com/Batteries/Battery_FAQ.htm#Lifespan%20of%20Batteries
http://www.batteryfaq.org/

ws9876

Re: if you were buying a couple of 6 volt batts

i do have a kiil watt lap is 15-20 tv is 95 tv 5 hrs lap 4 hrs lites 6 hrs..
what about Crown ??? 200 ah

icarus

Re: if you were buying a couple of 6 volt batts

I would buy a pair of reasonable quality golf cart batteries, Trojan or something similar, that you can find relatively cheap at the discount store. Then you have to have a way to keep them fully charged, ideally with a 3 stage charger with temperature correction like an IOTA or a Xantrex TC series.

Tony

ws9876

Re: if you were buying a couple of 6 volt batts

I heard Trojan had gone downhill, at least awhile back. I heard Crown was now better. Yes.???no???
Anyone in Salt Lake city know of a good source there...?? I go there every few months...