![]() ( Getting a battery to accept its last 15-percent of charge takes a lot longer than the bringing it up to 85-percent.) That way you should have the juice you need when you need it. When sizing your house bank, estimate the amp-hours at 50-85-percent anticipated usage and then go up 15-percent. You can install the solenoid wired to a momentary switch for emergency starting as insurance-I did-but a VSR is very reliable. Works like a charm-no heat, no voltage drop, no switches to throw to direct charge. A simple on off switch is installed also. Its wired like a three-way battery switch ( 1-2-Both). In addition to the voltage drop caused by an isolator, these also generate heat, further inhibiting charging.Ī VSR senses voltage and sends charge to whatever bank needs it, keeps both banks isolated, and requires no action on the skippers part after install. That's it.Īs for charging, I recommend, have installed and have been using a Voltage Sensitive Relay like those from BEP in lieu of an isolator. ![]() The solenoid connects the house and starting banks (batteries) for emergency starts. Just follow the instructions that come with them if you want to use Therefore, I am not going to cover them very These have a half volt drop between the house and starting battery, Iĭon't recommend them. These are commonly available at any auto parts or RV store. Another solution, and by far the most common, is using a battery isolator. House battery can not run down the starting battery. That means that if theĮngine is running, the house battery is being charged, and if it is off, the Solenoid, the magnet turns off, the bar falls and there is no longer aĬonnection between house and starting battery. When you turn the key off, current no longer flows to the Lifts a bar which makes a connection between the two large posts,Īllowing charging current to flow from the starting battery to the houseīattery. Power goes to the solenoid which activates a magnet inside it. What happens is that when you turn on the key, Radio since we know that when you turn off the key, the radio losses A good easy place for this is the power to the Wherever you splice in, it must beĪfter the ignition, so that when you turn the key off, power is turned off Whether you have one or two smaller posts, you must run a If there is paint on the fender or firewall where you areĪttaching the solenoid, you must scrap the paint off so that you have aĬlean metal-to-metal connection. What you have, take extra care to have a good clean connection for the The screws that secure it to the firewall act as the ground. Solenoids are self-grounding, so they only have one of the small posts. One is for a ground to theįrame, the other is to a hot wire in the vehicle wiring harness. Some solenoids there will be two smaller posts. Large post and runs back to the positive post of your house battery. Post to one of the large studs on the solenoid. A cable runs from the starting battery positive Once you have it, you mount it to theįirewall of your vehicle. Don't buy an intermittent duty solenoid, it won't A goodĪuto store will sell these or you can google continuous duty solenoid and It is using a continuous duty solenoid between the two batteries. The next solution is a little more complex but solves all of our problems. And carry a jumper battery as discussed earlier.Ģ. Marine starting battery which will not be damaged if you forget to turn One way around this is replace your starting battery with a Off? You run the risk of running your starting battery down and being But what if you forget to turn the switch Two batteries are connected again and the house battery is being ![]() The next day, when you areĭone camping and about to drive off, turn the switch to on and now the Starting battery so it can't draw it down. When you are going to be using the house battery, You attach the cableįrom the starting battery to this switch and run a cable from the switch The first and simplest is a battery selector switch. I'm not an electrical type so I'd appreciate any info. The solenoid seems more reliable and more robust (and cheaper). Pretty strongly.ĭoes anyone have more info on this option? Seems all I hear about is an isolator or a separator. ![]() To summarize (I pasted the section below), they recommend a continuous duty solenoid over a separator. And noticed the section on charging the house battery.
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