This does support my assertion that 2/0 is a suitable wire size option for adding a battery isolator even more, however. However, this sample size is too tiny and the statistics are too shaky, thus a warning is required that this information should only be used as a “just in case” and not as solid advice. What inferences can we make in light of this data? hardly much, to be honest The main lesson I can get from this data is that the alternator seldom charges home battery banks at rates higher than 100 amps. Some respondents didn’t know the exact amps they were using to charge their home batteries, but they did know the size of the fuse that was installed on the wire connecting the alternator to the battery, so we may infer that their amps never exceeded the size of that fuse. The following is a list of the wire and alternator sizes and the maximum amps that users reported seeing coming to their battery: Alternator Size 87% of the responses were evaluated to be 92% incorrect.īut I did find the following information: Wire Diameter To Reported Amps.21% would rather offer me unrelated advise than respond to my inquiry.18% of respondents were unable to distinguish between amps and volts.15% of respondents had no idea what a shunt was.50% of respondents were unable to determine the number of amps they were charging at.What then did I do? I contacted many camper van Facebook groups, which are THE source of dubious crowd-sourced data. I was more interested in learning the highest amps someone has ever seen connecting their alternator to batteries. I wanted to get some actual statistics from people who were using their alternators to charge their home batteries. Crowd-Sourced Data with Questionable Reliability With 2/0 wire, even at charging rates up to 149 amps, a 3 percent voltage loss will still be attained as long as the home battery bank is maintained within 12 feet of the starting battery. The majority of applications will never need amps that high, and the majority of alternators cannot produce that many amps. Under 50 feet in length, 2/0 wire with 105☌ insulation can manage currents up to 330 amps. Size Of The Battery Isolator Wireĩ5 percent of applications can be completed using 2/0 wire. The increased voltage of the lithium batteries may be seen by a standard battery isolator as “charging,” which will keep the batteries paired even though it shouldn’t technically “damage” them. You’ll probably need a lithium battery-specific isolator due to the lithium batteries’ resting voltage rates. On the alternator itself, it will normally be stamped into a metal plate. You may sometimes find the maximum amps your alternator will produce on the vehicle’s spec sheet. To manage the maximum amp output from your alternator, size your battery isolator. The size of your alternator will determine the size of your battery isolator.Įven though it’s unlikely that you’ll ever see the whole alternator output amperage pass through your isolator, it’s the only baseline you have. R v battery isolator how to#How To Calculate The Size Of A Battery Isolator: Simply said, this figure represents the maximum possible amps that might pass through the component from your alternator to your home battery bank. The majority of battery isolators have an amp rating. How to Pick a Camper Van Battery Isolator:
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