Self Powered Christmas Tree

[xenon]

Help, please, with a technical challenge.
I need to illluminate an 18' Christmas tree placed in a spot where there is no electricity available.
The tree is lighted with 100 strings of 50 bulb 120 Volt LEDs. The LEDs draw approximately 4.6 watts per string. The tree has to stay lit 24 hours a day for six weeks. The location is in a building where the temperature is a constant 72 degrees.
So to begin I need advice on an inverter-battery bank set up. Since the tree is indoors, AGM batteries would probably be required.
Since few could surpass me in my ignorance of electrical principles, what do I need to know about this before I proceed?

[Mike90250]

Help, please, with a technical challenge.
I need to illluminate an 18' Christmas tree placed in a spot where there is no electricity available.
The tree is lighted with 100 strings of 50 bulb 120 Volt LEDs. The LEDs draw approximately 4.6 watts per string. The tree has to stay lit 24 hours a day for six weeks. The location is in a building where the temperature is a constant 72 degrees.
So to begin I need advice on an inverter-battery bank set up. Since the tree is indoors, AGM batteries would probably be required.
Since few could surpass me in my ignorance of electrical principles, what do I need to know about this before I proceed?

1) With that many LED's, count on a couple of strings failing. They have no quality control on them.

5W x 100 = 500W of 120VAC.

Since it's indoors, forget PV arrays.

LED's should be ok with a mod sine inverter, which costs less than a pure sine . Because it's a constant load, I would use no less than a 800W and more likely a 1,000w inverter. name brand, not cheap stuff, you will regret it.

500W @ 12V = 41 A Ouch !!
24V = 21A
48V = 11A

** 48V DC system 11A x 24 hr =264AH

Consider a battery bank, that gets changed out daily, a half hour job, and have a spare inverter on hand.

will need 2 battery banks of 8 each :Crown 395 AH 6-Volt deep cycle flooded battery, L-16HC size. 11.625" x 7.0" x 16.125", 121 pounds.
http://store.solar-electric.com/cr395amdecyb.html $280 and interconnect cables
Better have 4 spare batteries on hand, they are going to be cycled pretty heavily daily (55% discharge) and the time to locate a spare will kill you. 6 weeks, 42 cycles total (21 per bank) will give them a workout. These aren't going in an airplane, 20 giant AGM batteries will be really $$$
300AH agm http://store.solar-electric.com/sunxtpvagmde.html $370 (70% discharge cycles)

I can picture 2 utility carts, each with a battery bank (968lbs) on it. Drive up in one, switch over battery cables (use ANDERSON connectors) 2minutes, and drive off to the charging station in the cart with the discharged batteries.
Anderson contact http://store.solar-electric.com/269g1lpbk.html
Anderson body http://store.solar-electric.com/anpo15to45am.html

Park the active cart in "Santas Shed" (2 carts wide) which will also house the inverter. Reconnect the fresh battery bank to the inverter.

Drive the cart with low batteries to the recharge area, where you have a 48V 20A charger. Hook it up via the anderson connector, and recharge. Should take about 18 hours to recharge, charging too fast damages the cells.

http://www.chargingchargers.com/quick-charge/qsp48-25.html

http://www.batterystuff.com/battery-chargers/48-volt/all/JAC1548H0891-112.html

http://store.solar-electric.com/iodl48vo15am.html

Are you sure they can't run an overhead electric cord to the tree? This is a lot of $$ to not use a plug-in tree.