[RE-wrenches] VFXR3648A battery charging

[William Miller]

Jay:



Thanks for that.  I always thought re-bulk only applied if you had 24/7 AC
input which we do not.  I made the adjustment and we will see what happens.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* Jay [mailto:jay.peltz at gmail.com]
*Sent:* Saturday, December 13, 2025 12:11 PM
*To:* william at millersolar.com; RE-wrenches
*Subject:* Re: [RE-wrenches] VFXR3648A battery charging



You have to set the rebulk volts higher, higher than what ever you start
the generator.



Say 56 or so.



Jay



On Dec 13, 2025, at 11:56 AM, William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:



Friends:



I have a client with one VFXR3648A inverter off-grid with PV and a
generator.  The inverter is set to bulk at 58.2 VDC for 2 hours but when
the generator is required the voltage never gets above 52 VDC.  The PV gets
the voltage up to the 58 volt zone reliable.



The original generator was a portable of about 3 Kw.  I thought it was not
providing enough RMS power so we upgraded to a Kohler vertical shaft 12 kW
air cooled unit.  The problem is still the same:  The bulk voltage of the
batteries never gets above 52 VDC.



On my next visit I plan on resetting the inverter to factory defaults.
Other than that I am not sure what to try.  I have little luck reaching
Outback tech support in the last year so I am hoping someone here can
provide some advice.



Thanks in advance.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





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