[RE-wrenches] Charging a HUP

Sun Feb 9 08:07:46 PST 2014

Thanks Jay,

We used to be able to figure the max charge rate at 25% of the packs
capacity. That might not work with the HUP packs.

Glad you have a manual! 

It is always a good idea to follow the directions in the manuals!

Later,

Bob Ellison

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of jay peltz
Sent: Sunday, February 09, 2014 9:38 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Charging a HUP

Hi guys,

The HUP manual specifies minimum charge rate of 136 amps, max at 272,

jay

peltz power

On Feb 9, 2014, at 1:38 AM, RE Ellison wrote:

Sounds like there is a need for a bigger generator, my gut tells me there is
almost enough (but not quite), with 12kw to almost max the chargers and
nothing left to feed the other loads.

I have found that "on paper" and reality do not always mix well.

Getting max theoretical charging capacity from solar and the generator at
the same time is sometimes a tough nut to crack, although batteries seem to
"like" the varying charge better than a steady max charge. That battery can
probably absorb 420 amps as the charging max using the usual 3 stage
charging we have with inverters, you're not getting anywhere near enough to
max them with that generator. Powering down all the chargers 30% or so (or 1
inverter totally) would help stop the breaker trips but slow the charging
off the generator. Then you just need to pray for lots of sun.

Is the solar alone enough to power the loads in the normal day to day usage
in a best case situation, or is this a case of the generator has to run to
keep up?

Up here we have seen 1 sunny day in 3 weeks, we know about generator
usage...

I can't speak on the HUP's. I have never used them, but might they be
somewhat hard to charge?

Just some thoughts, but it's 3 am and I hope it makes sense in the morning
when I reread it..

Later,

Bob

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of
bruce at willpowerelect.com
Sent: Sunday, February 09, 2014 1:29 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Charging a HUP

Hi Larry,

I have an FNDC in the system. Manufacturer wanted 2 hour EQ before adding
water to the new battery. We got that and had SG between 1.260 and 1.275 on
all 24 cells. Cells were very thirsty (shipped with electrolyte almost to
the plates) and took 8.5 gallons between all cells. We aren't having much
trouble getting voltage back up but SG is below 1.23 (within .01 on cells
tested). Strategy at this point is to give a daily bulk and absorb and EQ
every 3 or 4 days for extended times and monitor SG. Discontinue hard
charging when SG plateaus. I generally shoot for c/10 charge current, and
nervous about barely c/20 and a 12kw genset only giving me about 5.

Bruce

-------- Original Message --------
Subject: Re: [RE-wrenches] Charging a HUP
From: "Larry Crutcher, Starlight Solar Power Systems"
<larry at starlightsolar.com>
Date: Sat, February 08, 2014 11:50 am
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>

Hi Bruce,

Please explain "feeding it properly". Charging any lead acid battery slowly
actually preserves battery life. As long as you are achieving the
recommended charge voltage (temperature compensated) for long enough time,
and reaching 100% SoC regularly, you are caring for the battery.

At 82kWh battery capacity and 6.5kW PV, the customer may have a hard time
getting to 100%. You did not mention, but I HOPE you have a battery capacity
meter in the system. It's mandatory if they want to care for the battery.
Since the customer has a small generator, they need to realize the
limitations and reduce their loads during generator time so you can use the
full output.

Larry

On Feb 7, 2014, at 11:46 PM, 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

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