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I guess letting the husky bask in the shade of the panels isn't an option0
MC4 is likely a set of specifications, which may be subject to patents and licencing of varying length and enforceabilty in various parts of the world. Like any such set of specifications, it can and will be used to produce goods which will meet those specs to varying degrees. The original specifyer will have an interest in producing to that spec and protecting a brand name.1
> @Lumisol said:
> The best solution is a custom solution you build yourself. Best of luck to you.
Maybe, but in my experience the vast majority of people are happier with a packaged solution with fairly straightforward operating instructions.0
Having more panel than you really need is nice for light overcast days. If it was me and I could swing it, I'd get the extra string.0
If you can return/sell the inverters, even if you have to eat a reasonable restocking fee, I would do it. They look more appropriate for a large marine application like a big power yacht. If not, just be aware of the big tare loss. If you use one for the barn make sure you turn off all the barn loads when not in use, or better yet, turn off the inverter. You don't want to run the inverter just to keep some electronics in the laundry appliances lit.
As others have pointed out, the batteries are likely to be problematic. It is what it is though, so we should focus on doing the best we can with what we have. On the bright side, you will get a lot of knowledge and experience with loads etc and will be in a much better position to make replacement choices when the time comes.
A big problem with AGM is there is no good way to accurately measure state of charge. We can get a reasonable idea by measuring resting voltage (no loads or charging for several hours) though, so before hooking them up as a bank, I would:
1. Lable each battery with a number to identify.
2. Measure and record resting voltage for each battery.
3. Charge each battery individually and fully. You will probably have to do this again, so get a good multi-stage 12v charger. Note any batteries that seem to charge unusually quickly, unusually slowly, or get unusually warm while charging.
4. Repeat step 2.
If you get this far with no problem batteries there's a decent chance of making a bank that might work for a while. If you find some problem batteries, maybe you still have some recourse to the seller?
The main thing is to get the batteries in as close to the same state as we can, and with no outright bad ones. If they go into a bank with some weaker than others there's a good chance of ruining the weaker ones prematurely. Once in use, you will want regularly measure and record individual battery voltages and repeat the separate charging exercise for weaker ones.
The generator is likely a portable type, on wheels, designed to run tools etc on remote job sites?0