[RE-wrenches] 48V Charger Recommendation

[Mac Lewis]

Hello Jason,

I have had success with the cheap, variable power supplies on Amazon.  Its
nice to be able to adjust output voltage from 0-60V for the
various battery bank voltages we encounter.  You have to build your own
cord but they are small and easy to have on the truck.  They are slow but
typically, this isn't a big deal if you are just trying to get it above the
BMS cut out voltage.  There is very little actual charge from <40V to 48V,
then you can engage the power system to do the heavy charging.  I like to
be able to apply charge to the cell directly if there is one that is
problematic if there is access to the cell level.

Just remember that you probably want a power supply that doesn't require a
battery to wake up.   It's hard to have all of the tools, dongles, apps etc
that we need on a service call these days!

On Fri, Feb 14, 2025 at 7:01 AM Kirk Herander via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Jason,
>
> The NOCO GX4820 is a great charger. I've used it to dark-start Fortress
> and Blue Planet 48v cabinets, instead of dinky trickle chargers taking
> hours to do the same job.
> Priced at $500 a year and a half ago. its rated @ 110 -240 vac input. The
> one I bought came only with a 120v cord.
>
> On Fri, Feb 14, 2025 at 7:29 AM Jason Szumlanski via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> I'm looking for a suggestion for a good all-around charger for service
>> purposes. I would consider a 240V or 120V option. The purpose is primarily
>> to charge 5kWh lithium batteries.
>>
>> I would probably just pick up an EG4 Chargeverter, but it is
>> back-ordered. Something more portable would be nice.
>>
>>
>> Jason Szumlanski
>> Principal Solar Designer | Florida Solar Design Group
>> NABCEP Certified Solar Professional (PVIP)
>> Florida State Certified Solar Contractor CVC56956
>> Florida Certified Electrical Contractor EC13013208
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>
> --
>
> *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
>
> *Owner|Principal, VT Solar, LLC*
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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