Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 08-03-2019, 15:43   #1
Registered User

Join Date: Jan 2017
Posts: 9,985
Battery Protect now can customise setpoint via BT

New version Victron Battery Protect have bluetooth, custom program the LVD and return V
https://www.victronenergy.com/batter...attery-protect

Essential for use with LFP cells, tweak for changing conditions.

If only they also made an OVD version. . .
__________________

john61ct is online now   Reply With Quote
Old 09-03-2019, 04:47   #2
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 12,317
Re: Battery Protect now can customise setpoint via BT

Quote:
Originally Posted by john61ct View Post
New version Victron Battery Protect have bluetooth, custom program the LVD and return V
https://www.victronenergy.com/batter...attery-protect

Essential for use with LFP cells, tweak for changing conditions.

If only they also made an OVD version. . .
Thanks John. Excellent. Maybe they'll just improve the device to be selectable ovd/lvd?
__________________

rgleason is offline   Reply With Quote
Old 09-03-2019, 17:25   #3
Registered User

Join Date: Jan 2017
Posts: 9,985
Re: Battery Protect now can customise setpoint via BT

Or even better one device that can do both.

Good for those with a single buss for both loads and charging anyway, like users of combi style charger / inverters.
john61ct is online now   Reply With Quote
Old 14-03-2019, 02:34   #4
Registered User

Join Date: Sep 2015
Posts: 303
Re: Battery Protect now can customise setpoint via BT

Quote:
Originally Posted by john61ct View Post
Or even better one device that can do both.

Good for those with a single buss for both loads and charging anyway, like users of combi style charger / inverters.
Unfortunately, no. Battery Protect is an asymmetric FET, so it can only interrupt current in one direction. One of these cannot be used as the safety isolator in a homebrew battery monitoring system.
nebster is offline   Reply With Quote
Old 14-03-2019, 04:16   #5
Registered User

Join Date: Jan 2017
Posts: 9,985
Re: Battery Protect now can customise setpoint via BT

Yes I just meant "if it could" be improved

or a new device developed by Victron

to act as such, not be so limited

that "would be nice".

But certainly as is, I think this is still a great improvement,

more suitable than before as part of a DIY LFP

for those with separate charge and load busses.
john61ct is online now   Reply With Quote
Old 14-03-2019, 04:40   #6
Registered User

Join Date: Sep 2015
Posts: 303
Re: Battery Protect now can customise setpoint via BT

Quote:
Originally Posted by john61ct View Post
Yes I just meant "if it could" be improved

or a new device developed by Victron

to act as such, not be so limited

that "would be nice".
I see. Yes, that would be nice.

Quote:
But certainly as is, I think this is still a great improvement,

more suitable than before as part of a DIY LFP

for those with separate charge and load busses.
...and with (small) loads guaranteed to be lower than the rating (which itself is underspecified... "peak" for how long?).

FET arrays tend to fail quietly and infuriatingly: they cascade short and turn into wires.

Contactors have a distinct advantage here. For a given nominal rating, good ones can handle substantial overcurrent transients for periods well into seconds, and at the same time their primary failure mode (contact arc welding) occurs during breaking events rather than in normal use.

Put another way, if your Battery Protect is "on" in a system running normally, and you inadvertently apply something north of the peak transient current for 20ms, you may well now have a BP that won't P! (That peak is marketed as 2.5x the rated continuous, by the way.)

On the other hand, if your contactor is closed "on" in a system running normally, inadvertent transient currents well in excess of 10x the rated continuous are unlikely to do a thing. The device won't melt, and the contactor doesn't have a gap to arc over. It will still happily break a nominal current, later, in a shutdown event.

In large systems, substantial transients can be created as inverters with big buffers are switched into the system. (Ask me how I know!)

I'll stop there, and just summarize: don't use Battery Protects as pack disconnects in high-power lithium systems. They look cool on paper, but they're not robust enough for the job.

They're probably fine for small systems with light, unidirectional loads. Make sure you understand their drawbacks before proceeding.
nebster is offline   Reply With Quote
Old 14-03-2019, 05:41   #7
Marine Service Provider
 
witzgall's Avatar

Join Date: Oct 2006
Location: Eastern Shore, MD
Boat: Camper Nicholson 44 Ketch
Posts: 1,892
Re: Battery Protect now can customise setpoint via BT

Quote:
Originally Posted by john61ct View Post
Or even better one device that can do both.

Good for those with a single buss for both loads and charging anyway, like users of combi style charger / inverters.
Victron told me that you cannot use a Battery protect on an inverter charger. This was after mine stopped working, installed in such a manner. It only lasted a few minutes. I was drawing 50a at 24v, running an air conditioner. I do not recall the reason given. It was the non bt version.
witzgall is offline   Reply With Quote
Old 15-03-2019, 13:34   #8
Registered User

Join Date: Apr 2017
Location: Kansas
Boat: FP Salina 48, Hobie 33
Posts: 338
Re: Battery Protect now can customise setpoint via BT

I bought a Victron Multiplus for my soon to be home brew LFP setup. Would have done it later, but my battery charger died a month ago.

I now own the batteries (12 Sinopoly 200ah cells to run 3P4S) and I bought a 123Smart BMS in part because I can enable or disable charge and invert on the Multiplus independently with it.
__________________

Tornadosailing is offline   Reply With Quote
Reply

Tags
battery, rot

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What's the Best Way to Protect Keel Bolts ? Larsdelmar Construction, Maintenance & Refit 21 27-10-2013 05:54
Is it Better to Have a Net to Protect Dog Visitors ? otherthan Families, Kids and Pets Afloat 26 16-01-2011 14:30
We Serve and Protect? s/v Moondancer Cruising News & Events 9 26-08-2009 13:39
To circuit protect or not BassAckwards Construction, Maintenance & Refit 23 30-12-2008 13:08
Protect electronics from lightnings? freetime Navigation 2 23-07-2008 06:37



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:02.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.