DiploStrat
Expedition Leader
An ammeter will do at the top end, ensure endAmps is reached at Absorb most cycles before dropping to Float.
> I actually worry a bit about my present setup as I have only 40A available from the alternator because of the size limitations of my B2B.
The high charge rate is good for longevity but not as critical as the SoC top and bottom.
Go direct off the alt for the first few hours of driving sometimes?
Or save your pennies and trade up to Sterling's 120A if you think it's worth it.
On my last truck I used an intelligent relay and a pair of 1/0 AWG (100mm2) cables. I could crack 150A charge, but, as you well know, only for about thirty minutes. My maximum overnight drain is around 125Ah, so I am only discharging about 20%. I have noted that, even with massive cables, the battery voltage rises so fast that the real world sustained charging is around 50A.
I have used Sterling products in the past but this time around, I went with REDARC as I got two mints in one - 24v to 12v step down and an extra MPPT solar controller. (Sterling does sell a 24v to 12v B2B, but it does not include a solar controller.)
If the 40A proves not to be enough, I can double up the REDARC. The REDARC has the advantage of being extremely compact and not needing a fan.
So far, the real world performance has been excellent and, as many campsites only offer full hookups, I can always run the Magnum if I am worried.
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