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Will a 72 volt lithium-ion battery syatem work on a 60v tap transformer of the GS 12kw and the max will be 80vdc ? My 48 volt system max out at 64vdc on a ASL9,0 PJ transformer . The PJ 10.3 controlboard will blow up the FETs at 65 vdc but the 11.1 control board will not let the inverter to even start but shut down if the MPPT charge over 65vdc . PJ no longer sell the good 11.1 control board and replace with the 11.3 control board . The 11.3 control board will blow up the FETs on all older PJ inverter and need the mainboard cable modify by the seller so be careful if trying to make older PJ inverter to work .
72v is not 60v...if you have a 72v nominal battery bank (= 20S Li-Ion or 24S LiFePo4), the "full charge" voltage will be 84-86v, which is too high.
The 80v limit is an absolute limit--if it's exceeded for even a spike, the power chips tend to blow out. Main FET caps are 80v...and for that matter, the fans are rated to a maximum of 75v anyway.
So while the 12kw GS has the transformer ability for a 60v system, that's not 72v.
So while the 12kw GS has the transformer ability for a 60v system, that's not 72v.
The primary for the GS 12kw is 32vac for 48vdc battery system Will the 60v system also has the primary at 32vac ? A 72v or 96v battery system will need a different transformer as there is no room for a separate winding . Look like impossible and need a complete re-design to do 96vdc system . Thank you .
Will the 60v system also has the primary at 32vac ?
No. The 30v primary configuration is ideal for 48v usage.
60v "tap" configuration is 37.5v, providing a minimum pure sine voltage of 53vDC. (The "60v" config is actually a byproduct of 36v support.)
96v would be possible with the exact same transformer and size, though it would need a different winding spec (twice the turns, half the strand count). As a result, transformer losses will be exactly the same at 96v as at 48v.
but 96v would require 200v FETs (which have a considerably increased RdsOn), different DC filter caps (rated to 150 or 200v), and a 96v -> 48v step down converter to power the fans and logic. Due to the increased FET slew rate (resulting from the doubled DC bus voltage), the Miller spikes will be a lot worse--which may necessitate redesigning the FET gate drive circuitry to force the FET gates negative in off state.
I see lots of inverters for higher voltages like that in the industrial market.. At which point 130v is pretty common [substations], and then 480v, which then you're talking about 3-phase.
Almost no overlap with the off-grid community. Can't say i see much reason it would be worth the design investment - unless you want to make industrial inverters... haha
I have no interest in going into higher and higher DC voltages...simply because the safety risk goes up exponentially. There's a reason UL requirements top at 50v nominal. Besides, if you're getting into voltages that high, you might as well go HF. (EDIT: UL permits higher DC voltages, but the rules get considerably more difficult to follow.)
60v is simply an unexpected side effect of supporting 36v--which to my knowledge no other established LF inverter manufacturer does. Yes, we don't sell too many of them--but we have sold a decent number. They're especially valuable to people trying to utilize EV battery packs, which often are at weird voltages that don't fit into 24v or 48v brackets.
60v "tap" configuration is 37.5v, providing a minimum pure sine voltage of 53vDC. (The "60v" config is actually a byproduct of 36v support.) They're especially valuable to people trying to utilize EV battery packs, which often are at weird voltages that don't fit into 24v or 48v brackets.
MY 16s lithium-ion ev battery will work with your 60vdc GS12 kw ? Is 80vdc the maximun for OVP ? Do Sean sell the 60vdc GS 12kw now after the pre-order ?
Is 80vdc the maximun for OVP ?
80vDC is the red line, the cliff's edge, the absolute max before the inverter will likely fail. EDIT: and that's with the power switch turned off.
A reasonably safe maximum would be 72v.
16S Li-Ion at full charge would be 67.2v, which is well within the safe range. (16S nominal voltage is 57.6v)
A reasonably safe maximum would be 72v.
Thank you . Is the inverter wired for 60vdc done by Sean or are all inverter wired 48vdc in China ?
The 30v primary configuration is ideal for 48v usage.
Sean youtube answer all the questions about the 60vdc so 48vdc is better .
Thank you . Is the inverter wired for 60vdc done by Sean or are all inverter wired 48vdc in China ?
All final wiring is done by Sean.