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Old 06-21-2012
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newer battery switches alt protection

I want a friend of mine to help me determine if my 2 banks are correctly connected and ready for actual switching.(since I now have refrigeration. I was looking at perko and bluesea switches that "protect" the alternator field. Is this the way to go? they are not very $.

per Don Casey; "use isolation diodes" I think was written before the new switches were in production. duh? .. where does one obtain diodes they need to get and where to get them?
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Old 06-21-2012
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Re: newer battery switches alt protection

Denise,

The AFD feature only works if you have an easily accessible field wire to interrupt. With an external regulator this is easy but with a stock regulator not quite as easy. The AFD circuit breaks a split second before the load is disconnected thus avoiding disconnecting a load from the alt with the alt pumping out current and blowing the diodes.

The far easier solution with a stock alt is to feed the alt directly to the house bank then let an ACR or Echo Charger charge the start battery. Now you can switch the battery switch all you want and the alternator will always see a load.

The only things you'll need are some 2-6 GA wire, a fuse to protect that wire mounted close to the battery and preferably a "service disconnect" ON/OFF switch in the alt feed but mounted in the engine bay. This allows you to turn off the alt feed if working on the engine.
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Old 06-21-2012
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Re: newer battery switches alt protection

Denise

The best solution is to get the alternator output off the switch entirely - send it direct to the larger house bank and charge the start battery with either an Echo Charge or ACR. This makes the switch for "use" only and both banks will be charged automatically regardless of switch position.
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Old 06-21-2012
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Re: newer battery switches alt protection

Oh ok.. I have a blue sea ACR that I've been sitting on.. guess it's time!
thanks!
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