![]() Let me clarify a couple things so I’m sure I’m understanding this correctly. You may also wish to add a voltage drop calculation when selecting the wire gauge size, as, when voltage drops, current draw tends to increase. Wire gauge from battery to load is based on the anticipated max load current. I know wire gauge size is important to you, it is not the first time you ask this question, just in a different way. ![]() Their use is relatively new in Rvs and life cycle claims seem outrageous. LiFePo4s are an excellent battery, in theory. The advent of charge wizards are boon to RVers, as are gell cell maintenance free batteries. LiFePo4s are a bit different I believe, hence the use of a separate charge controller. But in none of these cases would you push 90amps at a single or pair of batteries.you would boil a lead acid battery and likely damage a gel cell. LiFePo4s charge differently than lead acid than gel cell. That isn't to say that for short periods of time that the wire couldn't carry a larger load current.Īs a side note, your 40 AMP fuse would likely not blow until the load reached 45 amps.īatteries charge at a lower current rate, and the rate of charge varies with the amp hour size of the battery and its construction and the number of batteries installed. Relating to wire size, wire ampacity is rated for continuous current carrying capacity. Not so much the battery, but it all works toward the end of preventing excessive current from damaging something. The fuse being placed close to the battery protects the wire And the load. There's a few variables here, but I'll address your protection questions first. Correct? If this is the case, then theoretically if a significantly larger converter is installed (let’s say 90 amp) without increasing the fuse size (and wire size), then the batteries would attempt to draw close to 90 amps from the converter when charging, and would therefore blow the fuse? Am I understanding this correctly? In this case the source of the current draw is the battery, so I assume the fuse is to protect the battery from drawing too many amps from the converter when charging? If the batteries drew too many amps, the fuse would blow before the wiring gets too hot. ![]() Therefore, if a larger converter is installed, then a larger wire is needed, and thus also a larger fuse appropriate to the wire size? Correct?Īlso, the fuse is placed closest to source of the current draw to protect the wire from overheating. Obviously a fuse protects the wire, so I assume the 40 amp fuse is appropriate for the gauge wire that is run between the battery and converter. ![]()
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