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Old 06-30-2022, 10:04 PM   #1
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Remote controlled battery A - B switch

I've been looking for a solenoid switch in an A/B/OFF configuration. It needs to be rated for at least 200 amps at 12 volts on a continued basis.


Some reversing motor solenoids almost pass, but are typically limited for only about five minutes.


Any ideas?
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Old 07-01-2022, 03:40 AM   #2
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Blue Sea has remote-control products. They provide typical system diagrams here. This "Remote Battery Management and ACR Subsystem" diagram may be closest to what you seek.
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Old 07-01-2022, 04:43 AM   #3
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Switching 200A under load may be difficult to accomplish without a fat wallet.
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Old 07-01-2022, 08:10 AM   #4
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Quote:
Originally Posted by Ray,IN View Post
Switching 200A under load may be difficult to accomplish without a fat wallet.

In this application switching is not done under load.
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Old 07-01-2022, 09:02 AM   #5
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There are relays made that make before break. In other words the first battery is still in the circuit while the second in connected, then the first drops out. I have never seen any with the amp requirements needed for an rv.
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Old 07-02-2022, 07:51 AM   #6
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Without looking at Bluesea battery management specs ,as that was my first thought and the next post. You could use pairs of modestly priced continuous duty or latching solenoids in parallel. Many of us are very happy with Bleusea MTL-ACR to replace BIRD/IRD and/or other combiner isolator . Cole Hersee is old trusted brand . They have a latching one that doesn't need reversing polarity from switch. It would simplify wiring at switch a bit if you wanted latching solinoids. Would you ever want both banks combined?
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Old 07-02-2022, 09:26 AM   #7
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Use 2 Blue Sea ML RBS and 1 switch that comes with it. They are designed to do this.
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Old 07-02-2022, 09:50 AM   #8
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Thanks to everyone who has chipped in so far. Some useful ideas here. Some post are off some what because I did not define exactly what I'm thinking about here. I intentionally omitted this because I did not want the conversation to wander off topic too much.


What's up is how to best precharge a Xantrex 2000 X Freedom inverter. A subject that Is relatively new to me. The purpose of precharge is to supply controlled power to the inverter only to charge up its capacitors before providing full power at startup.


The appear to be some very simple ways and some that involve much more complex circuits. I like the simple ideas of using a power resister. This involves using something like a 25 watt 30 Ohm power resister for a few seconds to charge the caps. Then it is switched off and main power provided. Thus the idea of 200 amp rated A-B-OFF switch. Plenty of manual types, but I would prefer to place these components in a remote location and control them by low voltage switches mounted else where.


I one idea is just two parallel solenoids. First one for the resister operation could be a cheap 10-20 amp standard relay operated with a momentary switch. Then use a 200 amp rated relay to provide main power. It would be nice if this relay was latching type to reduce wasted power while the inverter is on. It would be operated by a second switch. Probably DPDT to reverse the polarity to operate the latching function.


In this project there is only one battery bank and I'm not switching under load. I though that an A-B style switch would ensure the resister is out of the circuit when in normal operation. But I can achieve this with the momentary switch on the low powered relay.


OK folks I have another open thread elsewhere about precharging inverters and would like not to get into pros and cons about that in this thread. The question is where to find a remote controlled (relay) A-B-OFF switch capable of handling a 2000 inverter under load?
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