One of my sites has five eVault MAX. There is a little bit of SOC to Voltage difference, maybe one of them is going over causing the whole lot to trigger a shutdown. I would like to know the definite shutdown voltage setting. The next time I go there, I’ll bring a laptop, a dongle and poke the bear.
This has only happened twice in 2.5 years. So, overall, it is working great.
FYI, MidNite SPDs on all possible components.
Thank you,
Maverick
Maverick Brown Off-Grid Solar Commander since 2006 Maverick Solar Enterprises, Inc. • Solar Commander Remote Power • SunFlow Systems Cathodic Protection maver...@mavericksolar.com 512-460-9825
On Aug 27, 2024, at 6:43 PM, Dave Angelini Offgrid Solar via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
Just curious what high SoC is? I set mine for 95% or so and do not worry about the last few %.
Have not seen this problem but do not use fortress. Should not have shut downs offgrid except LBCO or lightning.
I really think that an SPD should be on the battery as well as AC in and out these days, especially with a 48V BMS. Tempting the demons!
On 2024-08-27 4:19 pm, Maverick Brown via RE-wrenches wrote:
Ray
I think you are on to something.
I have multiple eVault MAX batteries on a Radian and I have had mysterious random shutdowns with high SOC before.
Could be they were off grid at the time or had a big load shut off causing a voltage bounce.
The batteries are comm'd together but not to the Radian, of course.
If that is the case, I wonder if there is a newer battery firmware that can over come this or in fact why a LiFePO4 can't go over 55.2 when most have a 58.4V limit.
Thank you,
Maverick
Maverick Brown Off-Grid Solar Commander since 2006 Maverick Solar Enterprises, Inc. • Solar Commander Remote Power • SunFlow Systems Cathodic Protection maver...@mavericksolar.com 512-460-9825
On Aug 27, 2024, at 5:24 PM, Ray Walters via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
Is it possible that a load shut off, and then the controllers over shot the voltage long enough to shut the BMS off? If so, what's the solution? Lower absorb voltages? I checked voltage calibration between the various pieces of equipment.
Ray
On 8/27/2024 4:14 PM, Jerry Shafer via RE-wrenches wrote:
High voltage disconnect would do this, is the site monitored
The SPD was on one of the PV inputs before it came into the house. There were two Classics, each fed with its own PV input and SPD. It actually caused an underground splice to fail (high resistance) which I replaced the splice and restored full voltage, and both Classics were working fine. Just seems unlikely ( but not impossible) that the surge would make it past the Classic without damage, but then damage the Fortress BMS in an otherwise imperceptible manner. That is our current best theory at the moment though. I added an SPD on the 48 v buss, before this latest total shutdown.
Ray Walters
On 8/27/2024 2:35 PM, Dave Angelini Offgrid Solar via RE-wrenches wrote:
When I have had someone lose an SPD (I assume it was on DC buss) there is often latent damage (shows up later) to many of the devices. In a Hi Rel mode, it is recommended to replace it all. Most offgrid is not that critical but try telling that to someone with rotten food.
The freezers and reefers are often full of spoils that smells never go away. YUK !
On 2024-08-27 1:02 pm, Ray Walters via RE-wrenches wrote:
Greetings All;
I have Fortress Battery installation with a pair of E Vault batteries set up in a Master/ Slave arrangement. Its been working fine for over a year, but the customer just had a complete shutdown of the batteries which left multiple freezers, and refrigerator with rotting food. When he rebooted the batteries by turning on/off the main breaker on each, they both come up and showed 100% SOC on the Master, and 98% on the other. There were no fault codes. I just recently installed a larger PV array, and so the system has been reaching full charge every morning.
I have multiple calls in to Fortress, but not hearing anything back from them at all. We did have a lightning surge event a few months ago, that damaged a Midnite SPD (first ever for me), and took out the control board on the generator. One VFX inverter has an LED out, but we only use two inverters of the Quad stack, so I just switched to another inverter. All other equipment appeared fine: Midnite controllers, rest of the Outback VFX quad stack, and never any issues seen with the Fortress batteries.
The other odd thing, is since he rebooted the batteries, the system is working fine, and recharging to 100% by 9:30 am as before. Is it possible the Fortress BMS were damaged and are now having an intermittent shutdown issue? I did ask him to temporarily disconnect the comms between batteries, in case it is a bad BMS on one, it will isolate it from the other.
This is a tough one to figure out, since it hasn't happened again, and there are no fault codes. The Mate 3 shows a low frequency AC code, but that's usually just from the generator shutting down. Any help, ideas, experiences, would be greatly appreciated.
Thanks,
Ray Walters Remote Solar
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