Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2130
| Posted: 09:05am 14 Jul 2024 |
Sorry for Long answer
I was in a similar frame of mind until I realized the simplicity of the Nano controller, trying to get dual stage fans running at exact temperature trip points with the correct overlap and hysteresis was an absolute pain, and I'm over twiddling pots on a PCB over an over to get it right.
In the Nano, just 10 seconds to do that, works first time every time.
Using the Nano was like a dream come true for that adjustment, same with calibrating the DC voltage displays, setting AC voltage enable, AC under voltage etc and no external control circuits needed, and all can be done with the inverter running.
Monitoring the cap bank is important when Fuses or switches might be in the path and/or a Kilovac is used to automatically isolate the Inverter from DC input in the event of "ANY" fault, the reason I have never exploded a component with a failure is due to the DC current sense and AC over-current trip immediately removing DC input, much faster than the typical circuit breaker of fuse - IE the fuses never blow, the Kilovac and Nano always save them.
The second reason to accurately monitor capacitor bank voltage is it allows the controller to wait until the capacitor bank voltage is within 200mv of the battery voltage before bypassing the per-charge resistor.
Depending on the high value of capacitance, closing a pre-charge switch, either manual or automatically with more than 2 volts difference, will cause up to a 100A to 150A DC input spike - it does in mine.
Input spike is now ZERO. These things annoy me and manual pre-charge and bypass will never work for my wife, or me, if one day I forget - and I have with manual pre-charge.
As it is now, a complete Noob could switch the inverter Off and On, it's impossible under any condition to cause damage to the inverter, no matter how much you abuse the On/Off switch or disconnect and reconnect DC power cables or batteries in any fashion.
Finally, as I will NEVER go back to a manual pre-charge system or a system without a Kilovac, monitoring the Cap-Bank voltage at the moment of pre-charge bypass confirms the integrity of the DC path from Battery input to Cap-Bank.
During the inverter RUN state, it can warn you and also stop the inverter if it detects too much loss in that part of the circuit due to a sudden connection fault or other fault condition.
I agree, those little color AC status meters are just brilliant, and so dam accurate.
I have always loved programming since the early Pre-MSDOS days, mostly in assembler back then, once you get the programming bug you never get tired of it.
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