Re: [RE-wrenches] Stand alone battery charger

[bruce]

Check out Quickcharge out of Oklahoma. I have one of their 100 amp chargers working in tandem with some VFXs. Good folks.

Bruce Fiero-RMI

"Energizing the Rogue Valley"

4115 S Pacific Hwy

Medford, OR 97501

  

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-------- Original Message --------
Subject: Re: [RE-wrenches] Stand alone battery charger
From: Jason Szumlanski <ja...@floridasolardesigngroup.com>
Date: Tue, April 21, 2020 9:32 am
To: Dave Angelini Offgrid Solar <offgridso...@sti.net>
Cc: RE-wrenches <re-wrenches@lists.re-wrenches.org>

I'm not sure I follow. I would disconnect the generator AC2 input from the existing quad XW system and move it to the external chargers. Or, I could just turn the charging off by software config in the XWs.

If I were to buy four inverter/chargers to serve as "external" chargers for the battery (any brand, really) I would just connect the generator input to AC2 and the battery to the batt terminals of the four inverters. The AC1 input/output would have no connections. The inverter function would be turned off and the charger function turned on. 

Again, this would be an expensive solution. I'm sure there are some companies making high output DC chargers. I assume a 48V model will be able to go up to 60V charging output, which would be plenty for my 51V nominal system. 

On Tue, Apr 21, 2020 at 11:44 AM Dave Angelini Offgrid Solar <offgridso...@sti.net> wrote:

4 xw's need the external relay contactors not the internals, Right?

You will destroy the internals relays. If there was warranty still left, and there is not on 6048, you would need to scrap them for parts. Xw logs welded relay warnings and faults for warranty on all xw's.

Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail offgridso...@sti.net text 209 813 0060

On Tue, 21 Apr 2020 08:27:53 -0400, Jason Szumlanski <ja...@floridasolardesigngroup.com> 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 <offgridso...@sti.net> 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" http://members.sti.net/offgridsolar/ e-mail offgridso...@sti.net text 209 813 0060

On Fri, 17 Apr 2020 14:21:14 -0400, Jason Szumlanski <ja...@floridasolardesigngroup.com> 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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