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Charge two battery banks and keep them separate?
Charge two battery banks and keep them separate?
There are five ways of doing this: *The simplest way, if you can remember to do it, is to turn your battery switch to "BOTH" when charging, and turn it back to 1 or 2 when you are finished. This solution is risky for those who sometimes forget and then end up with a flat battery from time to time. If you want to automate the process and make it idiot proof, then you need to pick one of the other options.
* The best way, if you can manage it, is to have two alternators. This allows independent charging of each bank, and by fitting a combiner switch you get the added feature of a backup alternator for either bank in the event of a failure.
* The wrong way is to use a battery isolator, which is a set of diodes which allow the charge to go to each battery but doesn't allow the batteries to connect to each other. The big problem is that there is a voltage drop across the isolator means you need to have an externally regulated alternator with a voltage sense wire downstream of the isolator. Another problem is the high failure rate of isolators. Another is that the voltage drop means wasted energy.
* A good and successful way is to use a battery combiner such as the Blue Sea ACR This is a voltage sensing solenoid which connects the batteries together when they are being charged and separates them when they are being discharged.
* The fifth way is also a good way. Using either the Xantrex Echo Charge or the Balmar Duo Charge you can charge the start battery from the house bank. These relatively simple devices give a controlled low amp charge whenever the house bank is receiving a charge. |
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