This includes lights, fans, refrigerators, leveling jacks, etc. +DC Distribution: Most DC loads run on 12V. If you hope to enjoy high current charging through a battery combiner, like a Victron Cyrix, your house battery bank needs to be at the same voltage as your chassis battery bank, which means having a 12V house battery bank will be ideal. +Alternator Charging: Most alternators and chassis batteries are 12V. +Commonality: 12V systems are far more common than any other voltage which means that replacement parts will be easier to find, on shorter notice, at better prices. Most RVs are designed from the factory to work with 12V house battery banks. +Simplicity: If you need to get help with your system you are going to find more people understand 12V systems than any other voltage. If don’t need more than 3000VA of inverter output, go with a 12V system. Having a system with an inappropriate voltage will result in unnecessary cost/complexity, and potentially reduce options for future expansion. ![]() Then, only if you have a very odd system, look at 48V. When trying to decide what system voltage is best, we recommend starting low, at 12V, until you find reasons why 12V would be impractical. When more batteries, or cells, are connected in series you get higher voltage battery banks, like 24V, (25.6V lithium) and 48V (51.2V lithium). To keep things simple, these are commonly referred to as just “12V batteries”. With a lithium battery, you have four series-connected 3.2V lithium cells to make a 12.8V nominal battery. ![]() ![]() This nominal voltage figure has more to do with chemistry (the details of which aren’t really relevant to this blog) than something you would actually see on your voltmeter since 12V lead-acid battery banks can range from about 10V to 14V depending on the state of charge. This is created by having six 2V lead-acid cells connected in series, within one battery, and multiple batteries being connected in parallel to make a battery bank. When someone talks about a 12V system, they are usually referring to the nominal voltage of the battery bank being 12V. First, let’s make sure we’re all speaking the same language.
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