[RE-wrenches] Stand alone battery charger
Ray
ray at solarray.com
Tue Apr 21 14:29:49 EDT 2020
Are you sure its just the transfer switching causing problems? I've seen
quite a bit of lights dimming, flickering, and strangeness with XW
inverters ( and many others) just in normal operation. Certain LEDs are
particularly sensitive, just another appliance coming on can cause
noticeable flicker that bothers some clients. Our solution was to try
different brands of LEDs till we found ones that had less trouble. I
recall the Phillips ones being good, but you would have to test a few to
see.
Ray Walters
Remote Solar
303 505-8760
On 4/21/20 12:26 PM, Jason Szumlanski wrote:
> I have not looked into that, but the problem also exists
> transferring from inverter to generator. The owner wants "clean" power
> all the time, and just keeping him on inverter power all the time
> would be a solution.
>
> *
>
> *
>
>
> On Tue, Apr 21, 2020 at 9:35 AM Tump <tump at swnl.net
> <mailto:tump at swnl.net>> wrote:
>
> Have you shortened the transfer time from gen to inv, voltage “cut
> out"acceptance of the gen in power instead of their 90Vac to say
> 110V/L ? Raising the output voltage on the 6848s & gen set for
> VD/voltage sag issues under heavy loading? Watch this as sometimes
> under heavy loading it will cut the AC input. I use the config
> tool to address this kind of issue, gives me a bit more control.
> I have a client that has a large external battery charger similar
> to a fork truck unit that he alleges causes "dirty power" while
> the genset is supplying power to the charger, w/o charging thru
> the inverters. Unfortunately w/ the virus I have yet to confirm.
>> On Apr 21, 2020, at 8:27 AM, Jason Szumlanski
>> <jason at floridasolardesigngroup.com
>> <mailto:jason at 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
>> <offgridsolar at sti.net <mailto:offgridsolar at 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/
>> <https://mailtrack.io/trace/link/3c165022419c043bf7fae6f8ecf982e3ecc4a1fe?url=http%3A%2F%2Fmembers.sti.net%2Foffgridsolar%2F&userId=1613865&signature=465d0580a80dab11>
>> e-mail offgridsolar at sti.net <mailto:offgridsolar at sti.net>
>> text 209 813 0060*
>>
>> On Fri, 17 Apr 2020 14:21:14 -0400, Jason Szumlanski
>> <jason at floridasolardesigngroup.com
>> <mailto:jason at 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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