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Can the smart battery protect be used as a simple HVC on the charge side of a set of LiFePO4 batteries without any kind of external relay or communication from a BVM?
Intended use would be to set a cut off voltage, and rely on the SBP to be the first line of defence to disconnect charging sources if they ever rose above whatever voltage I'd set on the SBP?
I'm presuming it has bluetooth so I can set the required disconnect voltage?
I am interested in the same question.
@mikedefieslife, I'll say a couple of things regarding this, though ultimately of course I defer to Victron staff regarding the possibility of using it this way:
First, the "Smart BatteryProtect" has Bluetooth, the "BatteryProtect" does not. Be mindful of your product selection when ordering these, because the different models look identical other than that some say "Smart" and some don't.
Second, there is no replacement for a BMS. Your lithium system needs one. Neither this, nor any other battery protection device, is a replacement for a BMS.
Third, the BatteryProtect is a unidirectional device only; reverse current through the device will irreparably damage the device and potentially cause damage to your other components. Although it's technically possible to connect this device between a charger (charger only, NOT an inverter/charger) and a battery by connecting the "in" to the charger side and the "out" to the battery side, due to the high risk of doing this incorrectly I would strongly advise against it.
Bottom line: get a BMS for your batteries. Once you've made the investment in a LiFePO4 battery system, the components that monitor and maintain its health are not the place to try to cut corners.
Thanks for the input. I have a BMS for my batteries. Most people use the BMS as an absolute last line of defence and use a high voltage disconnect and low voltage disconnect. Sometimes these are controlled by the BMS, sometimes by a battery monitor (such as the BVM 712), or sometimes operate independently.
Since the Smart and the normal battery protect are unidirectional, I would imagine that all load outputs from MPPT controllers would need to be removed to prevent the risk of reverse current. There is no risk of reverse current with a regular battery charger or DC to DC charger.
@mikedefieslife, I see... I read the question to mean that you were trying to find a way around using a BMS, which is a question I see fairly frequently at the Victron/Sterling/Blue Sea distributor where I work.
While the BatteryProtects are primarily designed for low-voltage cutouts, I've run a demo product in VictronConnect and can confirm that yes, you can set the "shut down" voltage higher than the "reconnect" voltage (so, shut down the output at, say, 14.5v and restart at 12.7v); ignore the battery presets and select "user defined" and you can set your thresholds to 1/100th of a volt, so you should be fine there.
As far as MPPT controllers, those are already smart 3-stage controllers, so there wouldn't be any purpose to running them through a high-voltage disconnect... I'd expect any respectable charger to be the same; all Victron and Sterling chargers already have high-voltage protection in place.
So, in closing, yes, you can do this as long as you connect the device "backward", that is, the "in" to the charger and the "out" to the battery. My only concern in this case, other than the apparent degree of redundancy, is the potential for "bounceback" - that is, if your charger is for some reason malfunctioning and running at full-bore while your batteries are already charged and your BatteryProtect shuts down the output, the current "bounceback" could read as a reverse current in the BP, which fries the FETs in a matter of milliseconds... and since I run the test bench at this distributor, I have seen firsthand the damage to the BP and connected components when reverse current is applied.
If you're set on using something of this kind, I'm inclined to recommend the Sterling ProLatch R instead, which is a bi-stable and programmable latching relay that is much more robust and will accomplish what you're going for without running the risk of frying itself. It's a royal pain in the absolute nuts to program, but once it's programmed it's an absolute beast... Food for thought. Good luck!
Yes your bms should normally not have to engage, therefore you set the charging devices to the correct level.
The same goes for 'intelligent' discharging devices, like inverters, you set the minimum discharge voltage in those.
remains: 'unintelligent' discharge devices (loads), these you use the Battery Protect for.
I use a BPs in conjunction with my BMS for both the HVC and LVC. If any individual cell is too high, my BMS will drop the high signal to a Smart BP100. That BP100 has my mppt 100/50 and a non-victron DC to DC charger. It may not be good for the chargers to be turning on and off a lot, but my battery pack is pretty well balanced and has yet to trigger them. On the LVC I have a BP65 for my DC loads setup in the same way.
My Multi does NOT go through the BPs. I use the two wire assistant with optocouplers off the same hvc and lvc of the bms.
