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Old 04-11-2013, 12:06 PM   #95
rjtrane
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City: Palmetto Bay
Vessel Name: Sunshine
Vessel Model: Island Pilot DSe 12m Hybrid
Join Date: Apr 2013
Posts: 268
For the "soft" start:

1. 100w/10ohm resister.
2. Wire the resister from the battery side of the solenoid to a relay and then to the bus side of the solenoid.
3. When the BMS key switch is turned on, 12v closes the relay allowing 48v from the battery to the bus through the resister.
4. Install a time-delay relay that starts timing when the remote BMS key switch is closed (turned on). When this relay closes (about 5 seconds after the initial relay), it actuates the solenoid which then closes allowing full current from the battery to the bus.
5. Since I have yet to build in a delay for the DC/DC converters, the resister gets warm but not unduly hot. It stays in the circuit as long as the key switch is on (all the time unless working on the battery or circuits), but the current is flowing directly through the solenoid at this time, not the auxiliary resister circuit.

This "soft" start is working well.
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Reuben Trane
"Sunshine" - Island Pilot DSe 12m
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