Smart DC-DC Charger Isolated - Charging a battery on the same circuit as the input.

I have a setup with a 24V starter battery and a 700V traction battery. There is an onboard DC-DC converter that steps the 700V down to 27.6V, with a 150A capacity, to run the system after start-up. The onboard DC-DC doesn't have fine enough control to operate as a battery charger which results in the battery life degrading due to never charging above 27.6V.

By connecting the Input to the DCDC and the output to the battery would the charger function without having to disconnect the battery from the system? The input would be connected to the same circuit as the output.

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kevgermany ♦♦ commented · Apr 22 at 03:01 PM

Just so we understand, please confirm

You're thinking of disconnecting the 700-24V converter from the 24V battery. And putting an Orion DC:DC 24/24 in between the 700-24V and the 24V battery. The Orion should charge the 24V battery.

Is this correct?

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samjones kevgermany ♦♦ commented · Apr 23 at 06:42 AM

We would like to keep the 700-24V converter connected to the battery at the same time. As this setup is fitted to several vehicles we are trying to reduce the amount of changes needed to retrofit this battery charger. If that doesn't work we will have to disconnect the battery from the 700-24V converter.

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