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I will have 600 - 900ah of LiFePo4 batteries in my RV. Each 12 volt Battery is rated at 300ah with a 100Amp Continuous output and 200Amp Peak output. The Batteries will be wired in Parallel, keeping the system at 12 volts DC. 500Amp x 12v = 6000 Watts. 1000Amps x 12v = 12000 Watts. My RV has a 50Amp Service connection. Should I use a 500Amp Smart Shunt or the 1000Amp Smart Shunt? I think the 500Amp Smart Shunt with Bluetooth should be fine?
It's more the loads you'll be putting on the system than the battery size. So you'll have to guess at what you will use when/at the same time. Then work out shunt size. Also the voltage will be higher than the nominal 12V, which adds a little margin on 12V.
The 500A shunt will be fine. Even with 3 of your proposed batteries at best 300A could be sustained. Expect less. Do you even have any appliances likely to occasionally exceed that for more than a few minutes?
Our RV 300Ah 4 cell LiFePO4 battery with no internal BMS limitation has started the 3.9l TD truck engine having to deliver a measured brief peak of 740A possibly a few thousand times over the last 8 years of fulltime travel. The 300A Juntek shunt and the now 2 year old series added 500A Victron SmartShunt still look pristine.
