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Old 02-05-2021, 12:12 PM   #15
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Quote:
Originally Posted by Freqz View Post
It my case, it would be a 240V inverter so you need the auto transformer to provide split phase 120V. (I donít necessarily need split phase but I do need a neutral)

Iím building this around a 8k Quattro to support a mini split and induction cooktopó 6kVA seems a little light for my use. Your way gets more charging current and cost a bit less. Several ways to skin this particular cat!
Thanks!

I have a MS planned as well....as a matter of fact I already have the 240V subpanel installed and circuit run to the outdoor unit proposed location..... just trying to figure out the interior distribution plan, front and rear!

I can already run both rooftop units off the grid but calculating that the mini-split will use 40 - 70% less amps, depending on how we end up!
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Old 02-05-2021, 12:46 PM   #16
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Originally Posted by paul65k View Post
Thanks!

I have a MS planned as well....as a matter of fact I already have the 240V subpanel installed and circuit run to the outdoor unit proposed location..... just trying to figure out the interior distribution plan, front and rear!

I can already run both rooftop units off the grid but calculating that the mini-split will use 40 - 70% less amps, depending on how we end up!

Yeah, Victron shows ~2200W for my 15kBTU which is about what a 24kBTU mini split should take. Sheesh.

Iím still in the spitballing phase...this was much, much less complicated (and much cheaper!) for my 30A trailer . But itís also half the fun, I guess!
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Old 02-10-2021, 12:11 PM   #17
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Get a manual/diagram for your installed generator and investigate the capabilities of the generator itself. I'll bet it already has split 240 Volt dual circuit capability but has been configured to only supply a single circuit at 120 Volts.


If it seems capable, check with a full line service center (i.e. Freight Liner service center or equivalent that has electricians on staff) to see if they know how to do this.


Best Regards,
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Old 02-10-2021, 04:47 PM   #18
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Get a manual/diagram for your installed generator and investigate the capabilities of the generator itself. I'll bet it already has split 240 Volt dual circuit capability but has been configured to only supply a single circuit at 120 Volts.


If it seems capable, check with a full line service center (i.e. Freight Liner service center or equivalent that has electricians on staff) to see if they know how to do this.


Best Regards,
So the QD 7500 is only capable of single-phase as the windings apparently can not support split-phase output. The windings are not capable of developing split-phase hence the need for the autotransformer

In addition to this spec sheet, it was confirmed to me by Onan.
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Old 05-24-2021, 10:58 PM   #19
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Thought I would update this thread...........

I have the Autotransformer in my possession and plan to do the install next week. It looks pretty straightforward; I will intercept the input from the generator prior to reaching the transfer switch. The way it will be wired, the (2)v120V lines from the generator (sams phase) will feed into the Autotransformer on L1 which will then provide (2) lines out (L1, L2) which will now be 180* out of phase just like the 50A shore power input.....only difference will be that each line will only have 3600W (30A) each vs. the 6000W (50A) with a shore power connection.

Why is this important

Because right now when I run the generator L1 (1/2 the panel) is fed via pass-through and L2 (other 1/2) is fed by the 2nd inverter from the batteries while the 1st inverter is charging the batteries.......this of course is not the case with a 50A shore power connection because both L1 and L2 are 180* out of phase and each line passes straight through as well as BOTH are charging the batteries with a total output of 280A (@12V) which gets the batteries charged twice as fast

I will have to do a little power management if I need to run the generator AND run both AC units at the same time which can cause the breaker at the genny to trip, but in our system, we can set the available amps to 30 or any number actually, and the Inverter/chargers will manage the loads based on that without putting excess draw on the genny

Is that as clear as mud
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