3648 question/jay peltz [RE-wrenches]

[Christopher Freitas - OutBack Power]

The 0.90 factor was the efficiency of the VFX3648 at full power. Your 
right Bob-O (as usual) that estimating the current draw at 44 VDC 
instead of 48 VDC is more accurate.

So the actual current (without the safety margin) would be:

  3600 WAC / 44 VDC / 0.90 eff = 91 amps DC

The OutBack OBDC-100 breaker is 100% duty rated so the 125% John Wiles 
multiplier doesn't have to be applied as long as the cables are able to 
handle 125 amps.  

So - the bottom line is that the 100 amp breaker is too tight and may 
nuisance trip - its okay if the inverters are not expected to be ran 
hard but...  

You also can just sneak by with #2 AWG cables from the inverter to the 
breakers with the 100 amp breakers.  The cables to the battery should be 
larger however - and usually are since often they feed two or more 
breakers.  We offer a busbar now that can connect the battery side of up 
to four 175/250 amp breakers or up to six of the OBDC100 breakers - see 
the OutBack BB (or "Big Bus").  

Christopher Freitas
OutBack Power Systems
cfreitas at outbackpower.com
tel 360 435 6030




Christopher Freitas
OutBack Power Systems, Inc.
cfreitas at outbackpower.com  www.outbackpower.com
Tel 360 435 6030  Arlington WA USA

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