Forum Discussion
otrfun
May 20, 2022Explorer II
One of things rarely discussed in these types of discussions is the pre-existing alternator load prior to connecting the dc2dc charger.
On our Cummins (220a alternator; OEM configured, with no optional or additional electrical equipment connected) alternator load can vary from 40a to 70a. Load varies depending on the starter battery SOC and which accessories are in use (lights, a/c, etc.).
It's the remaining load capacity that determines whether a given dc2dc charger can be safely powered by a given alternator. Depending on the pre-existing load, a 160a alternator can potentially handle a given dc2dc charger with more headroom than a 220a alternator.
On our Cummins (220a alternator; OEM configured, with no optional or additional electrical equipment connected) alternator load can vary from 40a to 70a. Load varies depending on the starter battery SOC and which accessories are in use (lights, a/c, etc.).
It's the remaining load capacity that determines whether a given dc2dc charger can be safely powered by a given alternator. Depending on the pre-existing load, a 160a alternator can potentially handle a given dc2dc charger with more headroom than a 220a alternator.
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