Yamaha 2000iS and softstart with AC?
I have a older Yamaha 2000iS (not sv2) and a Magnum 3012 hybrid inverter but can’t run an AC due to the poor surge capability of the generator (it drops voltage too fast for inverter to ‘support’ it s...
Forum Discussion
Thinking about this a bit further, I checked the Owners Manual for your Magnum hybrid inverter and for my ProSine 2.0 (non-hybrid) and have come across a better understanding…
On pg 37 of the Magnum manual it talks about “dropout voltage” which is set at factory default of 80vac which is desirable (in many situations) to accommodate the load sharing feature:
“ 3.4 TransferTime
While in Standby mode, the AC input is continually monitored. Whenever AC power falls below the VAC dropout voltage (80 VAC, default setting), the inverter automatically transfers back to Inverter mode with minimum interruption to your appliances—as long as the inverter is turned on. The transfer from Standby mode to Inverter mode occurs in approximately 16 milliseconds. While the MSH3012RV is not designed as a computer UPS system, this transfer time is usually fast enough to hold them up. However, the VAC dropout setting has an effect on the ability of the loads to transfer without resetting. The lower this setting, the longer the effective transfer will be and therefore, the higher the probability for the output loads to reset. This occurs because the incoming AC voltage is allowed to fall to a level that is so low that when the transfer does occur, the voltage on the inverter’s output has already fallen low enough to reset the loads.
The disadvantage of a higher VAC dropout setting is that smaller generators (or large generators with an unstable output) may nuisance transfer. This commonly happens when powering loads that are larger than the generator can handle—causing the generator’s output voltage to constantly fall below the inverter’s input VAC dropout threshold.”
And in my ProSine 2.0 manual the issue of ‘Hysteresis’, pg 89:
“Consider a scenario: the PROsine is operating in charge mode from shorepower. The shorepower voltage falls below the transfer point of 90V. The PROsine transfers to invert mode and the shorepower voltage rises to 95V - but the PROsine does not transfer back to shorepower even though the shorepower voltage is now above the transfer point. In this instance the PROsine applies 10V of "hysteresis" to the transfer voltage before accepting the shorepower again (that is, the PROsine will require 100V on the shorepower before transferring back).”
On my pass-thru type ProSine (non-hybrid), ‘vac’ hysteresis is not user adjustable (though vdc is), and there are user adjustable settings for frequency (from 40 to 70hz) and voltage dropout (85 to 135vac range)…
So, hysteresis can play a role, but it would appear that lowered settings will help facilitate a smoother transition to the eco mode…
I believe that the above issues need to first be considered before opting for a Soft-start…You might try a test by connecting the air cond directly to the generator (bypassing inverter, while in eco mode) and hope for success…
3 tons
On pg 37 of the Magnum manual it talks about “dropout voltage” which is set at factory default of 80vac which is desirable (in many situations) to accommodate the load sharing feature:
“ 3.4 TransferTime
While in Standby mode, the AC input is continually monitored. Whenever AC power falls below the VAC dropout voltage (80 VAC, default setting), the inverter automatically transfers back to Inverter mode with minimum interruption to your appliances—as long as the inverter is turned on. The transfer from Standby mode to Inverter mode occurs in approximately 16 milliseconds. While the MSH3012RV is not designed as a computer UPS system, this transfer time is usually fast enough to hold them up. However, the VAC dropout setting has an effect on the ability of the loads to transfer without resetting. The lower this setting, the longer the effective transfer will be and therefore, the higher the probability for the output loads to reset. This occurs because the incoming AC voltage is allowed to fall to a level that is so low that when the transfer does occur, the voltage on the inverter’s output has already fallen low enough to reset the loads.
The disadvantage of a higher VAC dropout setting is that smaller generators (or large generators with an unstable output) may nuisance transfer. This commonly happens when powering loads that are larger than the generator can handle—causing the generator’s output voltage to constantly fall below the inverter’s input VAC dropout threshold.”
And in my ProSine 2.0 manual the issue of ‘Hysteresis’, pg 89:
“Consider a scenario: the PROsine is operating in charge mode from shorepower. The shorepower voltage falls below the transfer point of 90V. The PROsine transfers to invert mode and the shorepower voltage rises to 95V - but the PROsine does not transfer back to shorepower even though the shorepower voltage is now above the transfer point. In this instance the PROsine applies 10V of "hysteresis" to the transfer voltage before accepting the shorepower again (that is, the PROsine will require 100V on the shorepower before transferring back).”
On my pass-thru type ProSine (non-hybrid), ‘vac’ hysteresis is not user adjustable (though vdc is), and there are user adjustable settings for frequency (from 40 to 70hz) and voltage dropout (85 to 135vac range)…
So, hysteresis can play a role, but it would appear that lowered settings will help facilitate a smoother transition to the eco mode…
I believe that the above issues need to first be considered before opting for a Soft-start…You might try a test by connecting the air cond directly to the generator (bypassing inverter, while in eco mode) and hope for success…
3 tons
