[RE-wrenches] Stand alone battery charger

Tue Apr 21 12:41:53 EDT 2020

See screen shot. The external is sold by Schneider but you can also
obtain them.  

Dave Angelini Offgrid Solar
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don't"
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text 209 813 0060

On Tue, 21 Apr 2020 09:39:19 -0700, Jerry Shafer 
wrote:  Wrenches, Jason I have done this when l dont want tranfer switch
operation but you are looking for 400 amps at 51vdc that around 20 kW of
charger. l used golf cart chargers but you may want to consider a forklift
charger, they are quick and basic, the BMS/U will manage the charge rates
anyway. I would run everything through a shunt for monitoring either
through the box or via an eguage and DC shunts. You should be able to let
the inverter turn on genny but programmed as a DC charger not AC at least
with Outback we can do that. Fun times Jerry  NABCEP PV Inspector   
  On
Tue, Apr 21, 2020, 5:28 AM Jason Szumlanski  wrote:    I actually need
400Adc at 51V nominal of total charge rate. I was hoping to use 100Adc
chargers for redundancy, or some combination of 2-8 chargers to reach the
needed current, assuming they can be synced up. I don't think the charging
algorithm needs to be complicated. We are basically bulk charging the LiPOs
to 80% with the battery BMS controlling the generator. The concept is to
get to 80% sometime in the night and solar kicks in during the day to reach
100% using 2-stage charging from the XW charge controllers.   The problem I
have is the quad XW6048s in the system run at a pretty good load
typically... often over 50%. This is off-grid with generator backup. The
transfer switches in the XW6048 are causing surges and brownouts when the
switched loads are high, especially smart dimmers and televisions. I need
seamless power for this client. My thought is to abandon the internal
chargers in the XW6048s and just run loads off inverter power full-time. I
would charge the batteries with external battery chargers. The tricky part
is how to adjust the charge rate based on load, and also based on solar
input. I need to limit the net charging current. Of course, I still need
400Adc of charging current, which I'm learning might be hard to find. I
don't really want to buy four more XWs - that's a pretty expensive
solution.    Jason Szumlanski Florida Solar Design Group    
  On Fri, Apr
17, 2020 at 4:26 PM Dave Angelini Offgrid Solar  wrote:  

I use the CSW
4048. It has a 50 amp charger. A good spare for clients. Get 2 of them.
Repurpose an old Radian or XW well over 100A. XW+ is 140adc. 

DAVE
ANGELINI OFFGRID SOLAR  
"we go where powerlines
don't"
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e-mail offgridsolar at sti.net
[6]
text 209 813 0060

On Fri, 17 Apr 2020 14:21:14 -0400, Jason Szumlanski
wrote:  I'm looking for a standalone 51V nominal battery charger suitable
for a LiPO battery with 2-stage charging and adjustable setpoints for max
current and battery voltage. It would require dual chargers with 100A
capacity (I want dual chargers for redundancy so I have at least 50%
capacity if one goes bad). Ideally they would sync up so they change stages
simultaneously, but I'm not sure if that's really important.    Who makes
something like that?   Jason Szumlanski       
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