Great point.? Also, if you’re like me and don’t necessarily use actual chargers, but instead power supplies used as a 2-or 3-stage charger, consider that as a charger, the power supply needs to be able to handle running in current limit for a long time (most of the charge cycle).? A friend bought a 30amp “charger” for his boat pack but quickly found it would just shut off after long.? I looked into its detail design and the power control chip used and indeed the circuit was doing what it was wired up to do.? In his case, I got this resolved by adding a resistor in one spot that based on the specs of the chip allowed the power supply to run in current limit continuously.? We also found that the subsequent iteration of these “Meanwell” power supply/chargers actual include a switch allowing enabling of 2-stage charging (constant current limit “CI” phase).

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Also when you are cruising (genset running, chargers delivering and motor pushing), if you really need maximum or some minimum amount of steady power from your genset to the pack, be sure that the pack voltage is BELOW the CV set point for your charger/power supplies.? Listen to the genset and if it starts running easier, there’s your clue.? It’s very easy to think you’re still getting full power to the pack only to find that the voltage rose slightly and now one or more of the supplies starts ramping its current output down.? When this happens you can also experience “motor-boating” or a cycling between full-current, then lower, then full again, then lower again as the chargers drift in and out of the CV ramp.? To avoid this, increase the speed of your motor until the charge voltage drops below the start of the CV ramp.

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