Victron smart shunt

countrykids wrote:
I just installed a Victron smart shunt in our class c. I have two group 27 batteries so in setting up the device I entered 200 in battery capacity, 50% in discharge floor and enabled Soc alarm at 50%. Does this seem right?

Nope.

Group 27 sized RV/Marine "deep cell" batteries typically have a Ahr capacity of closer to 80 Ahr each perhaps a bit less. With 2 you have 160 Ahr max and at 50% about 80Ahr for the pair.

Since these are in reality a "combo" start/deep cell, they do neither job well and also have a much shallower DOD if you really want the get the maximum rated discharge cycles.. Basically not much more than 20% of the capacity should be used if you care about getting the max life from them..

I would set my SOC alarm at least 10% higher than the floor.

countrykids wrote:
I just installed a Victron smart shunt in our class c. I have two group 27 batteries so in setting up the device I entered 200 in battery capacity, 50% in discharge floor and enabled Soc alarm at 50%. Does this seem right?

I have a Victron smart shunt..Yes it sounds right if your batteries are really 100ah each..And as mentioned above,you can choose 50% or whatever for longevity..The secret is to get the true details of your battery to enter into the app for the most accurate results..Ballpark numbers will give you ballpark results..

Your realworld ah capacity will vary depending on your discharge style and the condition/care/age of your batteries.

12.2v typically represents 50% SOC for a lead-acid battery. Me, I'd do a load test and see how many ah's it takes to get the voltage down to 12.2v. That's your discharge floor. Double that result for your realworld battery capacity.