[RE-wrenches] Charging a HUP

[Chris Mason]

A 12KW generator can produce 250A at 48V, and the breaker should be 12KW
*125% or 62.5 amps.
You may have an unbalanced load, you probably can only put 6KW per leg of
the 240V feed.


On Sat, Feb 8, 2014 at 2:46 AM, <bruce at willpowerelect.com> wrote:

> Hi All,
>
> 3 VFX 3648
> 2 FM 80
> 6.5 kw solar
> 12 kw generator
> PSX 240 on generator output and VFX stacking
> Mate 3
> HUP 1690 ah
>
> System design considering 45 amp charge current from each VFX totaling 135
> amps. (135 x ~55v = 7.42kw)  Potential charge current from 2 arrays and FM
> 80's, 90 - 100 amps. On a good day, reasonable to expect 200+ amps?
> Have not been able to exceed 90 amps for more than 30 minutes, with the
> generator putting out about 9 kw before it's 70 amp 2pole breaker trips. L1
> 42 amps, L2 37 amps. 5 amps neutral. Load banked to 12.3 kw (51 amps @
> 240v) resistive without breaker trip.
> I have had to dial back the maximum charge current in the Mate 3 to 12
> amps each on two of the inverters (L1 and L2) and 8 on inverter 3 to keep
> the generator from tripping out when customer turns on the microwave or
> coffee pot. In effect, 42 amps charge @ 240 v = 7.6 kw. At the battery, I'm
> only seeing 80 amps of charge current. Running loads are typically less
> than 1 kw but there has been a of construction going on with chop saws and
> compressors creating annoying spikes that are easily handled by the
> inverters when the generator is off.
> I don't want to kill this new battery by not feeding it properly! I would
> have put in a larger generator, but the owner bought the 12 kw before
> deciding on the new battery. I thought the 12 would be merely adequate, but
> not so....
> Any suggestions?
>
> Thanks!
>
> Bruce Fiero-RMI
>
>
>
>
>
> *"I'd put my money on the sun and solar energy. What a source of power! I
> hope we don't have to wait until oil and coal run out before we tackle
> that." T. Edison, 1931*
>
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-- 
Chris Mason
President, Comet Systems Ltd
www.cometenergysystems.com
Cell: 264.235.5670
Skype: netconcepts
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