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I have 2 x Multiplus II 48/8000s that I am planning on wiring in parallel to provide 240 out and charge the 48V battery bank.
I'd like to have my generator on auto-start to help provide power and charge the batteries as required. It has a 120V output cable, can I wire that into the AC-IN of a single Multiplus II or do I need to wire the generator into both units?
I'll contact you by email about this.
If parallel units then it must be connected to both. If split phase then you can connect it to one unit and be sure to deselect "switch as group" when configuring the multi's
Okay, thank you so much for that info.
I do have a 240V out cable for the generator but it only has four lines on it. L1, L2, N, and G. Do I need a different cable to wire it up to two Multiplus?
I haven't seen any documentation that suggests 2 x 48/8000 cannot be used in parallel. And they were purchased by the dealer for this purpose.
The manual doesn't suggest some models of Multiplus II can parallel while others cannot: https://www.victronenergy.com/upload/documents/MultiPlus-II_230V/32424-MultiPlus-II___Quattro-II_120V-230V-pdf-en.pdf
https://www.victronenergy.com/upload/documents/Datasheet-MultiPlus-II-inverter-charger-EN.pdf
Virtually unlimited power thanks to parallel (not for the 8k, 10k and 15k models) and three phase operation
@Guy Stewart (Victron Community Manager) shouldn't this limitation be spelled out at 4.4.7 in the manual @AlaskanNoob links to?
I would point to the page 32 of said document where one can get false notion that this model can be connected in parallel.
Read the description of the pointer "E"
2x RJ45 VE-BUS connector for remote control and/or parallel / three-phase operation
So is this an error or MP-II models 8k, 10k and 15k can be connected in parallel?
Just saw on the data sheet that it specifies 8Kva (and two other Multiplus II versions) don't support parallel. I really wish the manual had specified that. And that our Victron dealer had been aware of it.
When discussing what equipment to buy for our off grid installation, he suggested that two 8000s could be put in parallel and that we could use the Victron autotransformer on the other side. So we bought all three components, the 2 x MPII 48/8000 and the Autotransformer (not to mention the Lynx Distributor and the 2 x SmartSolar 450/200 MPPTs). The dealer wrote:
"You set it for 60 hz and 240v is standard. What’s different is it has no neural or 120 output. Hence the Autotransformer. You can stack parallel victron gear. If you wanted 2 8000s that would not be an issue. It would be 66A into the 100A auto transformer."
So we said, "[Name], can you add another Multiplus II like the other onto the quote so we have the option to run single phase 240V at double the amps (70-ish)?" and he responded "Can do and we will add a second 8000."
I suppose the next step is to contact the dealer and hopefully ship these two 48/8000s back to the lower 48 from Alaska (not cheap) and get 4 x 48/5000. But first, @Guy Stewart (Victron Community Manager) could you confirm that we can't parallel two 48/8000 models? I'm hoping it's just an old data sheet document and that page 32 of the manual (which does indicate that 8K-15K models can be run in parallel) is correct and informed my dealer's understanding.
It just seems odd that we can parallel up to six Multiplus II 48/5000 models, but not 2 x 48/8000 models. Hopefully this data sheet just hasn't been updated?
Any updates here? Looking for 10k unit and don't want to have to rip/replace in future or waste wall space for 2x 5000s to add 2x more later.
