[RE-wrenches] Issues with HomeGrid

Tue Sep 23 08:16:37 PDT 2025

I intend to get the stacks Internet connected on my next visit. They just got
Starlink at this remote location. The batteries were being used for power during
the new home construction when there was no Internet on site. I'm doubtful that
the faulty BMS will be able to make a connection now, but who knows. 

It seems like the Internet connectivity of these batteries is pretty useless
anyway. The app certainly is. And customer support never asks you if it's online
- they require a Windows laptop, special cables, and remote support software to
do diagnostics. It seems the only time WiFi comes up is when they want to deny a
warranty claim. 

Based on my conversations with customer service, which again, seems very
competent, efficient, and patient, it became apparent that their Chinese
overlords are probably calling the shots. I didn't get the sense that the RMA
escalation procedure was going anywhere useful. They had the lowest level
customer support agent get back to me with the bad news via email. I am
appealing the decision, but won't hold my breath. Meanwhile, the homeowner is
suffering with batteries not communicating, a 25% reduction in capacity, and
uncertainty on where to go from here.

Bottom line:

Must be Internet Connected = Not Suitable for Off-Grid Use

Oh, by the way, HomeGrid and Sol-Ark are pointing fingers at each other about
the master BMS in this system not communicating properly with a Sol-Ark 15K. The
BMS is recognized for a few seconds, with the Sol-Ark reporting the correct SOC%
from the battery on the main screen, then it reverts to Voltage mode
automatically. There is no information displayed in the Lithium Batt menu. 

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

[data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=3D]
On Tue, Sep 23, 2025 at 11:01 AM Jay <jay.peltz at gmail.com [jay.peltz at gmail.com]>
wrote:

> You’ve convinced me to never touch a home grid. 
> 
> 
> Out of curiosity, did the system get web connected at somepoint?
> 
> 
> 
> > On Sep 23, 2025, at 8:48 AM, Jason Szumlanski via RE-wrenches
> > <re-wrenches at lists.re-wrenches.org [re-wrenches at lists.re-wrenches.org]>
> > wrote:
> 
> > 
> > It was only a matter of time. HomeGrid is denying warranty on a BMS that I
> > did not install. I can't prove when it was purchased or installed, but the
> > original installer never registered it or connected it to the Internet. It
> > was likely installed just over a year ago, perhaps 18 months. There was no
> > Internet on site at the initial time of installation. What a garbage
> > warranty policy.
> > 
> > 
> > In this case, the BMS seems to be working behind the scenes. The battery
> > modules are charging and discharging (confirmed with EMS Tools). The problem
> > is that the LCD display shows all zeroes, and the unit will not work in
> > parallel with the three other stacks. It is causing a parallel error and
> > shutting down the whole house.
> > 
> > 
> > I did exhaustive diagnostics on it with HomeGrid support, and they sent me a
> > "CANalyst-II" tool to try to unbrick or update the faulty unit. All attempts
> > to recover the unit failed, but I can "see" the whole stack of battery
> > modules through the BMS's RS232 port. 
> > 
> > 
> > So they're going to further alienate a customer over a clearly faulty BMS
> > unit that should be replaced under warranty. Not smart.
> > 
> > 
> > 
> > I will reiterate my recommendation against this brand for off-grid use. It's
> > simply not resilient enough and too hard to service/maintain.
> > 
> > 
> > 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
> > 
> > 
> > On Tue, Feb 11, 2025 at 9:17 PM Jason Szumlanski <jason@
> > floridasolardesigngroup.com [jason at floridasolardesigngroup.com]> wrote:
> > 
> > > For what it's worth, they haven't said anything about internet
> > > connectivity on these two systems I'm dealing with right now, and they are
> > > both Gen 3.
> > > 
> > > 
> > > One site has a bunch of firmware discrepancies, and this is the site with
> > > one module that has all cells low voltage. Not sure if it's even
> > > recoverable. It's sitting at 39V.
> > > 
> > > 
> > > The other site has all the same firmware. This is the one I went to today.
> > > One of 16 modules (2 full stacks) has one of 15 cells internally that is
> > > low voltage. To me, that's a clear warranty swap situation, but customer
> > > service wasn't having it. Disassemble the battery and charge it? That's
> > > not a solution. It has been escalated. We will see what happens. 
> > > 
> > > 
> > > Clearly we should be able to take these back to the shop for diagnostics
> > > at a minimum and get them RMA'd. Requiring the purchase of a Windows
> > > laptop and a battery charger is not ideal for sure. 
> > > 
> > > 
> > > The only good thing I can say is customer service took over my PC today
> > > remotely and ran diagnostics after installing the required software (which
> > > isn't a fast process). I was expecting them to say, "yep it's toast and
> > > we're sending you a new one, valued customer."
> > > 
> > > 
> > > No such luck. 
> > > 
> > > 
> > > Jason
> > > 
> > > 
> > > 
> > > On Tue, Feb 11, 2025, 6:48 PM Tyrone Houck via RE-wrenches
> > > <re-wrenches at lists.re-wrenches.org [re-wrenches at lists.re-wrenches.org]>
> > > wrote:
> > > 
> > > > Yep. And the 10 year warranty is only good if connected to the internet.
> > > > Firmware update of every module is crucial or else there will likely be
> > > > imbalances. You may be able to address it as 1 and shut of the others
> > > > and charge it through the bus but if it's cell voltage is too low it may
> > > > be an rma situation. I have had similar issues especially with gen 2.
> > > > Zero issues yet with any gen 3 modules but the internet thing really
> > > > struck a nerve as they only just recently got their internet monitoring
> > > > functional.. having to go back to every site is a serious pain just to
> > > > ensure what should be a basic warranty. Best of luck and feel free to
> > > > contact me offsite if you have any other questions I might be able
> > > > to  help with.
> > > > Tyrone Houck
> > > > Oregon Solarworks LLC 
> > > > CCB #204937 LRT #076
> > > > 541-787-1366 
> > > > tyrone at oregonsolarworks.com [tyrone at oregonsolarworks.com]
> > > > 
> > > >    
> > > > 
> > > > On Tue, Feb 11, 2025, 3:36 PM Jason Szumlanski via RE-wrenches
> > > > <re-wrenches at lists.re-wrenches.org [re-wrenches at lists.re-wrenches.org]>
> > > > wrote:
> > > > 
> > > > > Hi Wrenches,
> > > > > 
> > > > > 
> > > > > I am regretting some HomeGrid Stack'd off-grid installations right
> > > > > now. There is a major flaw in the way these function in an error
> > > > > state. For those of you that don't know, these 48V batteries are
> > > > > stacked with a single BMS on top, covering up to 8 batteries below.
> > > > > Each battery module has a circuit breaker and dip switches to identify
> > > > > the battery communication number and location in the stack. Each BMS
> > > > > can be paralleled to additional stacks with communication cabling. 
> > > > > 
> > > > > 
> > > > > The issue is when one battery module goes into an error state. What
> > > > > will happen is that battery stack's BMS will recognize the error, and
> > > > > then shut down the whole stack. This cascades to the other stacks and
> > > > > the system shuts down - fails to deliver 48V at the output terminals
> > > > > on the BMS of any stack.
> > > > > 
> > > > > 
> > > > > That is annoying, but what's even more problematic is you can't just
> > > > > shut off the offending battery to bypass it. You need to physically
> > > > > change all of the dip switches to bypass it and then reprogram the BMS
> > > > > to re-recognize the new module count (after taking it out of
> > > > > parallel). This is all very time consuming and requires the inverter
> > > > > system to be shut down. Even if a battery is not in an error state,
> > > > > you can't just turn it off. The whole system goes haywire. 
> > > > >  
> > > > > Once you have it bypassed, you can hook up a RS-232 cable (Mac users
> > > > > need not apply) and use their software to gather diagnostics. Customer
> > > > > service will then want to do additional diagnostics with the battery
> > > > > in the stock, but that is not reasonable in and off-grid system where
> > > > > uptime is critical. One of the faulty modules I am dealing with was
> > > > > diagnosed as one of 15 cells with low voltage. The "solution" is to
> > > > > take it out of the stack and charge it to 100% with an external
> > > > > charger. 
> > > > > 
> > > > > 
> > > > > By the time I'm done with all of the diagnostic nonsense, I can almost
> > > > > pay for a new battery with the lost labor. Isn't the whole idea for
> > > > > this not to happen with balancing done automatically? It was suggested
> > > > > to me that it didn't get charged to 100% often enough, and that is why
> > > > > it happened. That isn't an acceptable reason for failure in an
> > > > > off-grid system. 
> > > > > 
> > > > > 
> > > > > I hate to say this, but EG4 has a far better 5kWh solution in this
> > > > > respect. Each module has it's own BMS. When one fails, you can simply
> > > > > turn off the circuit breaker and everything else continues to work. In
> > > > > fact, a fault in one BMS doesn't take out the whole stack or stacks of
> > > > > battery modules. 
> > > > > 
> > > > > 
> > > > > Back to HomeGrid. When this happens, in my mind this is an automatic
> > > > > RMA. They should be replacing these, no questions asked. Especially at
> > > > > almost twice the price of EG4. They actually want me to disassemble
> > > > > the case of the battery and charge it with an external charger (which
> > > > > I don't have) directly from the terminals that are internal to the
> > > > > battery case. Totally unacceptable. Whatever is inside that case is
> > > > > their problem in my opinion. 
> > > > > 
> > > > > 
> > > > > I am not selling anymore HomeGrid until I get satisfactory resolution
> > > > > to these issues. EG4 isn't perfect, but I have actually had pretty
> > > > > good success installing some that I sold and quite a few that
> > > > > consumers purchased directly. And at almost half the price, it's
> > > > > easier to eat the cost of a battery here and there for customer
> > > > > satisfaction.
> > > > > 
> > > > > 
> > > > > Anyone have similar issues with HomeGrid?
> > > > > 
> > > > > 
> > > > > Jason Szumlanski 
> > > > > Florida Solar Design Group
> > > > > _______________________________________________
> > 
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