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20A - Dedicated charging station for laptops, ipads, phones.Here are the circuits we chose to run on the 12 Volt side: We opted to try the 20 amp ones since we sized half our 12 Volt circuits at 20 Amps. Unfortunately for us, these converters tend to be on the small side (10, 20 and 30 amp 12 Volts seem to be the norm), meaning we would need to use multiple converters to supply enough current. As a result, there is an abundance of inexpensive and highly efficient 48 Volt to 12 Volt converters. We needed to find a way to get the 48V DC coming out of the batteries down to 12V DC in order to run our water pump, fans, house lights, chargers, etc.įortunately for us, the golf cart industry has been running 48 Volts in golf carts for years. While stationary off-grid systems have been increasingly trending toward 48 Volts, increasing the availability of things like inverters, charge controllers and BMS units, one problem is that most RV DC powered devices are 12V. A quick version is that it increases efficiency. There are many reasons why we went this route which you can read more about here (more details here). While most traditional RVs run their house power from 12V batteries, our house batteries run at 48V (actually closer to 55V). If you have been following along with our build, you know that our house batteries are far from the traditional RV system. This last system is what we are dealing with in this post. The second set of batteries are usually "deep cycle" and are meant to power both the 120 Volt AC household power like air conditioners, microwaves, and outlets as well as the 12 Volt DC house systems such as lights, pumps, stereos, etc. Much like a car, it is often 12 Volts with batteries that are designed to provide a high output but are not usually "deep cycle". The first electrical system is to power the vehicle part of the RV. Most modern motorhomes actually have three discrete electrical systems powered by two separate sets of batteries. After getting the A/C power mostly squared away and tested, it was time to tackle the 12V DC "house" power side of things.