I need a 12v SLA for powering a device in the field.
Battery >
Exeltech DC/AC Inverter XP125: 125 Watt 12VDC In 120VAC/60Hz Output that runs at aprox 85% efficiency >
DV-RA1000: Voltage Requirements: Japan/USA/Canada 100-120VAC, 50/60hz
Power Consumption: 34W
Thanks to Chris (VA TAPER):
ok, I did some quick math:
Part 1:
Watts=Amps x Volts
35w=xAmps x 120 Volts
35w/120 Volts = .292 amps
.292 amps x 1.15 for 85% efficiency = .335 amps @120 volts
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Part 2:
12v27Ah battery =120v2.7Ah battery
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Part 3:
2.7Ah/.335amps=8.05 hours from the 12v27Ah battery, efficency loss already included from inversion.
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Part 4:
Moral of the story: even the old ecocharge 12v7Ah batts for the AD1K will run this thing for 2 hours.
peace, chris
I'd like to use a Power Sonic 12V/18AH (PS-12180) to err on the safe side, the next smallest 12V SLA is 12V/12AH (PS-12120) but it puts me a little too close to possible run time than I'd like. What I'd really want to know is if a PSC-12800 charger intended for use with batteries from 4AH-12AH (max output 800mA) would be sufficient to charge the 12V/18AH battery. The next charger up is about a $100 leap in price and is rated for use with batteries from 12AH-40AH (max output 4000mA).
Do I need the bigger charger to fully charge the 18AH battery? If it's just a matter of charge time it's not an issue.
The other possibility I was considering was running 2 6V 7.2AH SLA's to accomplish the 12V, but I'm not sure how running them in series would work with the inverter, plus it's less capacity. It might be easier and save me from having to buy another charger, my Eco batteries are 6v 7.2AH and use a Powersonic 6V charger, but I'd still need to pick up batteries since I'll be using them for the V3.