SunSynk 16kw Internal Battery Circuit Breaker Tripping
1. I have had a few instances where my internal positive terminal battery circuit breaker has tripped when nearing 10kw. I noticed that these internal breakers for the battery inputs are rated at 200Amp. The spec sheet indicates the ability to charge/discharge the battery at up to 300Amps (This is larger than the circuit breaker's rating). Is this a design error? Am I misunderstanding this point? Please could someone clarify this point?
2. The Spec sheet also indicates a maximum Off-grid AC power output of 13000W. Some basic maths ( 13000w/50vDC = 260Amps) This 260Amps would also exceed the 200amp rated internal DC circuit breaker. Is this a design error? Am I misunderstanding this point? Please could someone clarify this point?
3. If I were to take the 200Amp (DC breaker rating) and multiply it with a battery voltage of 50VDC It would show that this inverter is actually only capable of letting 10Kw out the batteries and into the inverter. This would explain why my DC breaker was tripping when nearing the 10kW mark. That means that if you were to use the SunSynk 16kW as an off-grid unit; you can actually only pull 10Kw from it. This is quite a far cry from the illusive 13kw (off-grid) tag.
Looking at the battery connection terminals in the sunsynk max each positive is connected to it's own 200A MCB and the negatives are solid i.e. not going through a MCB. Whennthe MCB's are both closed both positive connections are shorted together. I am assuming that up to 150A can be drawn through each MCB to reach the 300A limit set by the inverter and the MCB will not trip. My problem is that if one MCB opens because develops a fault then the remaining MCB will see the load and trip if it goes beyond 200A. I don't like this. I also don't like the M8 bolts in my opinion they should be M10 and the width of the cable connection bay is approx 20mm which is too small to accept say a 95mm cable lug. I agree a 300A single MCB and a larger positive and negative connection bay may be an improvement but would not accomodate paralleling of inverters according to the schematic diagram.