Paul,
I make the difference as 2 hundredths of a volt differential at full continuous rating for the cables within the enclosure... and that assuming a foot or so of cable each rail..... multiply it out for the 5 or 10 feet to the bank.... were talking .... well not bush fire potential.... nor even a sack of wet mice....
The 33mm cable on the American Wire Gauge Conductor Size Table
http://www.solaris-shop.com/content/American%20Wire%20Gauge%20Conductor%20Size%20Table.pdfRated for 94A continuous. the 50mm... about 140amps... so are they both wrong?
If you read the notes, that is very conservative, and in fact the NEC would put it as a power transmission cable in free air.
"Current (ampacity) Notes
: The current ratings shown in the table are for power transmission and have been determined
using the rule of 1 amp per 700 circular mils, which is a very conservative rating. For reference, the
National ElectricalCode (NEC) notes the following ampacity for copper
wire at 30 Celsius:
14 AWG - maximum of 20 Amps in free air, maximum of 15 Amps as part of a 3 conductor cable;
12 AWG - maximum of 25 Amps in free air, maximum of 20 Amps as part of a 3 conductor cable;
10 AWG - maximum of 40 Amps in free air, maximum of 30 Amps as part of a 3 conductor cable.
Now this if for continuous not intermittent. Max continuous is only 80-100amps for this little inverter ( 4kw or so@50v )
In relation to those notes, two conductors will get a higher rating for the same mmsq than a single, as the surface are as a proportion to surface increases as the diameter falls.
If you do your sums, either wire will do the job just fine from a safety perspective ( cant believe I'm saying this Bruce)
Considering it will run happily from less than 48v through to over 65v, it would be difficult to peddle the voltage corruption line... and the nicely sized cap bank negates the transient argument too.....
But fear not......you have done for electrical theory what Cleopatra did for the steam engine.
The manual does not however disclose far more dangerous behavior....
Interestingly I had to fix a deceleration system on a butchers band saw today. it safely returns the cutting bands to stationary in less than 1 second, other wise turning it off it runs for 5 mins or more because of the inertia in the large driving drums, and the nice bearings... very dangerous condition while clearing the meat from the table..... What was interesting for this discussion... is that the timer that controls this is a omron dial timer.. preset for the appropriate deceleration time needed to bring the thing to a stop....
Guess what happens if we increase the rpm by 20% without changing the timer as well........ SMA has no right to mess with things like this....and would be criminal in this case were it to happen, and a hand went west..... and without disclosure.
No matter the installation, they deliberately allow and in fact belligerently program this to happen if installed incorrectly...
OR if it loses control of the loop for any other reason ( faulty shunt etc)...... it should just shut off if they are so concerned... thats the real nub of this.
To unilaterally speed up every induction motor within reach, not knowing what they power or how they integrate with the world is stupidity I have never witnessed before.... or the ballasts, or any saturated on purpose device ( eg ac relays, ferro transformers, etc )... even chokes will be out of range.
The national power grid here run the same number of cycles per 24hr period... They do this for a reason, not just to make life difficult for themselves. Too many things rely on consistent reliable power, and SMA have chosen to not provide it.... even when their system is running "normally" it is outside spec of any self respecting power grid... even the one over here with diesel generators and hamsters on steroids, they keep it in the range.
For a lawyer to pull that off ... the judge would need to be sex starved, and the lawyer .. a Pamela Anderson ( in her day) look alike.
..... oztules...........bewildered again