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This circuit is designed as a disconnect switch that allows the user to pre-charge the inverter capacitors before turning the switch completely on.
26 June 2020 update:
This circuit is designed as a disconnect switch that allows the user to pre-charge the inverter capacitors before turning the switch completely on.
26 June 2020 update:
- At request of a forum member I added a circuit design for 48 volts.
Warning: I have not built/tested the 48 Volt design. - Added comments on how to build the circuit without the PTC thermistor.
- Expanded on building the circuit without the PTC thermistor. (It is not needed in many (Most?) situations)
- Updated link to PTC in the parts list.
- Added slide showing the connections in the four different switch states. (this helps explain how the circuit works)
- Added label and printing instructions for Perco 8511 switch.
- Added discussion of Inverter Disconnect vs Battery Disconnect
- Added assembly picture for building w/o the PTC resistor.
https://diysolarforum.com/threads/48v-disconnect.62004/post-776166
48V would be an odd max voltage but would make sense for a nominal voltage, so I tend to believe the email from Marinco.
Unfortunately, it is still the closest thing I have found to something that works. I have built it and it works... but the mixed messaging leaves that big question mark. YMMV
Now that the cyber truck uses 48V for their low voltage systems, hopefully we will start seeing more items clearly supporting 48V.