Not to step on sponsor's toes, but: What size SLA . . .

albee · « **on:** 24 Jul 2005, 12:21 am »

Would be needed to run a pair of Flying Moles (DC version) for the usual 10 to 12 hours before charges? Would it take a regular automotive battery or could a true SLA be used?

Gordy · « **Reply #1 on:** 24 Jul 2005, 12:06 pm »

I'm using 7ah SLA's wired for +/-48v to run two UcD 400 modules for an easy 12 hrs. between charging. Specifically, starting at 54v and recharging at about 49v. The oem recharger was designed to auto recharge at 42v to prevent deep discharge, so I figure my 12 estimate is pretty conservative!

HTH!!!
Gordy

albee · « **Reply #2 on:** 24 Jul 2005, 07:24 pm »

Thanks, Gordy, but that was over my head. How many batteries are you using? The Moles can put out up to 160 watts per channel and are about 95% efficient as far as current is concerned. I was thinking along the lines of a single battery to feed both.

I wrote the Moles four days ago and have heard naught from them.

Gordy · « **Reply #3 on:** 24 Jul 2005, 09:05 pm »

Hi Albee,

I'm not at all familiar with the Flying Moles, but their min./max. operating dc voltage will determine how many batteries you'll need. The T amps are the easiest as they only req. +12 to 15v dc/a single battery, the Teac 700p's have a max. of +/-30v per rail (I think), so need 2 batteries per rail (4 total) for +/-27v. The UcD's I'm using operate at their best at between +/-45 to 63v so I'm using 4 batteries per rail for 54v at max charge and a max. wattage into 8 ohm of 150. After about 12hrs. of play (depending on db

) the batteries are down to about 48-49v output and 130w. Using a transformer the UcD's could put out their rated wattage of 200w into 8 ohm, but I gladly sacrifice the power for the pristine power supply! Economically this probably wouldln't pan out, but a few of us were able to get the USP's (4 batteries and charger) needed for rewiring from an overstock/reseller for $60 a pop (Thank you Occam!!!). These are unfortunatly no longer available as somebody bought all 80 of the remaining units

Wiring the batteries for +/- voltage is a snap, heck, if I can do it... and if anyone has run the FM's on batteries before, you can probably read up on it at DIYAudio.com or AudioKarma.com. In fact you can find a diagram for wiring up a 24v supply in AudioKarma's gainclone section posted by Gonefishin'! That's exactly where I got started. Well, that and bugging Gonefishin', Vinnie and Occam to death! PM me if you like for whatever limited info I might be able to supply ya...

albee · « **Reply #4 on:** 27 Jul 2005, 03:52 pm »

Gordy, the specs show one Mole operating at 1/3 power would draw 5 amps (per hour?). So, two would be 10--what does that mean to me looking for 12V battery power?