The point is that if you're using a pre-charge resistor each time you turn the inverter on, you don't need to.
Pre-charge resistor seems crazy
- Thread starter JRUD
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The point is that if you're using a pre-charge resistor each time you turn the inverter on, you don't need to.
corn18
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Fair point.
True. I turn off my inverter by disconnecting it from the batteries so I always need to precharge.
There's an app for that. If you have Victron. LOL. I haven't touched the physical switch on my Victron Multiplus since it was installed. I use the app or the Touch 50 screen connected to the Cerbo GX.
Do you not have solar on your trailer to keep the batteries topped up?
corn18
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I know. Not sure why I still have a switch for the inverter now that I have the current surge limiter vs. the precharge. That works every time.
I do have solar but sometimes it's dark out
timselectric
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I'm not aware of any that do.
It's not a concern for the inverter.
Only a problem for the battery BMS.
(And maybe your lug)
SilverbackMP
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I’m gonna have eight 16s batteries each going through their own 250 amp breakers as the wires (4/0 gauge marine rated) enter into a Midnite Solar 2000 amp combiner box. And from the combiner box, the inverter (4x SI) will each get a 250 amp breaker. Also 300 Amp Blue Sea fuses on each battery going into Anderson connectors (Similar to Ray Builds Things/Ray in Texas’s setup but higher capacity breakers/fuses).
Should be able to turn everything off and turn on one at a time…I hope. And avoid some inrush to the inverters(?) and scary sparklies.
Still need to figure out something to keep from zapping a few of the BMS components (REC master/slave setup) though.
Should be able to turn everything off and turn on one at a time…I hope. And avoid some inrush to the inverters(?) and scary sparklies.
Still need to figure out something to keep from zapping a few of the BMS components (REC master/slave setup) though.
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Hedges
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Potentially, that may blow a fuse, may burn contacts of a BMS relay (if used), may damage breakers.
People here have welded a relay with lithium & SI, and people have blown fuses (forget if with SI or other.)
If you aren't going to have BMS disconnecting and reconnecting, because inverter keeps BMS happy, only have to deal with precharge manually when starting up.
How about giving one battery a second breaker or switch, feeding through a resistor capable of carrying 0.3A (standby current)?
Close that breaker/switch to precharge all inverter capacitors, then close all the battery breakers.
What's the issue that could zap BMS components?
People here have welded a relay with lithium & SI, and people have blown fuses (forget if with SI or other.)
If you aren't going to have BMS disconnecting and reconnecting, because inverter keeps BMS happy, only have to deal with precharge manually when starting up.
How about giving one battery a second breaker or switch, feeding through a resistor capable of carrying 0.3A (standby current)?
Close that breaker/switch to precharge all inverter capacitors, then close all the battery breakers.
What's the issue that could zap BMS components?
Britman
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Frick I wonder if you would make a small post with some pictures of what you use .. that sounds like a great addition
Inverter Disconnect Switch with Precharge
To get the paper, click on the orange button at the top of this page. This circuit is designed as a disconnect switch that allows the user to pre-charge the inverter capacitors before turning the switch completely on. 26 June 2020 update: At...
diysolarforum.com
cs1234
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Alternatively, if you don't mind spending some money, you could buy the battleborn csl500.
Disclaimer, I haven't tried one, but they have been discussed here on the forum. Solved some problems for somebody that was having problems with his battery bank going into overload on inverter reboots.
I suppose I could, next time I dig in there I’ll get pics. Battery is sort of buried at the moment, glad it’s working without intervention.
@Britman
diysolarforum.com
My pre-charge resistor answer for my inverter
I was asked to post a pic, finally dug enough junk out to get to the battery. I built it nearly a year and a half ago and haven’t seen it since, it’s been working flawlessly the resistor is wired from position 1 to output, battery is position 2 to output. turning from off to 1 allows a 10/sec...
diysolarforum.com
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