Tesla model "s" battery system being built, and I am on "the list" for my 6000 GS......

So the basic premise is the "nominal" voltage of the battery bank in question, vs the design spec voltage of the inverter.

If these are the 6S Tesla blocks, a GS set to 36v should work well for 2 blocks in series.  However, if they're 7S blocks (somehow!), then you would be advised to use the 48v GS inverter with 2 in series.

Nominal voltage of the 6S blocks is (3.6vpc * 6) = 21.6v.  Empty is (3.0vpc * 6) = 18v...full is (4.2vpc * 6) = 25.2v.  Yes, that's close to a 24v inverter spec, but the waveform quality will suffer much below 24v due to the internal design...and your batteries will still have a lot of storage energy left.

With 2 blocks in series, that's an equivalent 12S battery bank, where (3.6vpc * 12) = 43.2v nominal.  Empty = (3.0vpc * 12) = 36v.  Full = (4.2vpc * 12) = 50.4v.  While that's a bit on the high side, especially if you only charge your batteries to 4.1vpc (49.2v), that's not much beyond the 48.0v spec expected for lead-acid batteries at low temperature equalize (=16vpc *3 = 48v).  Shouldn't be a problem.

At the higher voltage, you'll have reduced current, lower losses, and require fewer MPPTs for the total design ;-).

Why is there such a wait for these inverters. I'm in the market for a couple basic ones without UPS and ATS. I'm doing a 55kw Lifepo4 batterybank and I'm wondering if these inverters can be connected in parallel. 

Thanks Sid.....my tesla batteries are indeed 6S and so I do want to take your advice and use the 36 volt GS inverter.  I am planning on limiting my batteries to somewhere around 40 volts on the low side,  and 48 volts on the high side.  To drain these batteries below 38 volts in series will destroy them and they will not charge again,  and on the high side,  if overcharged above 50.2 these can (or will) burst into flames and because of the chemistry, the fire cannot be put our easily.   I am going to wire in extra voltage shutoffs for the low and high ends for these reasons.   Thanks.....  Jim

Why is there such a wait for these inverters?  Shipping delays, finding manufacturers for a supply chain, etc., etc., the list goes on and on!  It's basically 3 months from when we order until there's a chance they might be delivered to the Genetry Solar warehouse...assuming there aren't any issues.  Kinda funny how the Chinese try to figure out a problem for 2-3 weeks until we get suspicious that something might be wrong and start pressing for details...and after they finally admit that they're having a problem, then I solve the problem in 2 days.  That sort of thing certainly didn't help.

We might have ordered the first batch back in October of last year.  But they didn't actually make it to the shipping dock until the 3rd week of December.  And then it's been shipping delays from there.  Another shipment was shipped before the Chinese New Year earlier this month.  We plan to order another batch as soon as possible after the Chinese New Year holiday is over...trying to get enough units that we can have stock here in the U.S. and ship inverters within a business day or 2 of customers placing orders.

Just so you're aware, Genetry Solar inverters are NOT rebranded pre-made Chinese units.  These are designed to our custom specifications...and that's soon to be completely from the ground up.  The Genetry Solar LF Control Board wasn't designed in China.  It was designed right here on my laptop in Ohio, on a 100% off-grid solar system, with Ubuntu Linux 🤣😇.

Can the Genetry Solar inverters be connected in parallel?  If you're referring to multiple inverters working in parallel to power a load, theoretically yes.  (First successful test of that code yesterday, now I still need to refine it.)  You get AC-powered battery charge, ATS/UPS, grid-tie master / slave support, 3-phase, 2-channel generator start and other features thrown in for free 😉 .  Maybe down the road in a software update, but that's all going to be available.

Perfect, that will run a 36v GS inverter quite nicely.

Jim send me a quick text with your email so I can confirm this change with you.

Thanks and welcome to the forum

That is awesome. There is a high demand for quality inverters. I'm working on a project which I may need a lot of the completely off grid version without generator back up, UPS,ATS, etc cuz they'd rather oversize the array and batteries than use a generator.  

We only have one version of the Genetry Solar inverters: fully loaded.  If you don't need the features, don't use 'em 😇😉.   No upselling here, just the world's most versatile inverter for the price point.  Keeps stock requirements down too 🤗

Now, if there's a mega-order where cost is an absolute importance, we can customize the design for your needs--but you'd end up only saving a couple of dollars out of the whole cost.  Generator start is literally 2 small relays that the CPU can control...then AC input (ATS/UPS/charge/grid-tie/sync/3-phase) is one large 50A relay and a few other miscellaneous parts.  (If we're talking a dozen inverters, it's not worth customizing the unit.)

Jim, I am also using Tesla packs in series, although I only have two at the moment. May I ask what BMS are you using, and what charge settings do you use? I use electrodacus' SBMS0 and do not charge to 50.2V, only to 48V for better longevity of the bank.

My PJ inverter warns at 43-42V and I think dies at 41V, so I can't use most of my capacity there, which is why I ordered a 36V GS inverter- it covers the range of these packs better.