230VAC Bosch mini-split on 240VAC ?

[TaliaDPerkins]

I have this Bosch Mini-Split arriving by Friday.


https://www.amazon.com/Bosch-Efficie...-garden&sr=1-1


Their model BMS500-AAS012-1AHXXA. It has no listed tolerance for it's voltage, but they give the range of 208VAC to 230VAC.


I plan on powering it with an AIMSPower 120/240VAC inverter. It's a bit late to change which heat pump I ordered, and I don't think I have to get an autotransformer for 240VAC to 230VAC. But I'd love to know what you all think?


Secondly, I have a 36ft bus which will have the roof raised 18" and about only 20% of currently glazed area kept, that to be double paned. Floor will have an infiltration barrier as close to 100% as I can make it, and the walls/ceiling spray foamed. The wind will not blow under it, skirting to ground will be provided. Think this 1 ton unit will cool it effectively, and heat it in VA for most of the winter (small woodstove otherwise) ?

[rossvtaylor]

There's so much confusion over line voltages, in part because the single phase line voltage used to be 110...but is now more commonly 120. And 220 is more often 240. But people also refer to 115 and 230. There's enough variability in the grid that appliances have to work with a fairly broad range of voltages. So you do not need a transformer

208 is generally 3 phase, so it's a bit odd that that was mentioned. But I can't believe that a mini split would be three phase. That's a commercial or industrial grid type

[TaliaDPerkins]

I can see why Bosch made sure their higher voltage option can run on it.



What I wish their Tech Supp would get back to me on is, of their 208/230VAC range, what is the tolerance? Is 240VAC AOK?


Maybe they didn't get the question?

[DeMac]

Originally Posted by TomDPerkins

I can see why Bosch made sure their higher voltage option can run on it.



What I wish their Tech Supp would get back to me on is, of their 208/230VAC range, what is the tolerance? Is 240VAC AOK?


Maybe they didn't get the question?

It's common to have two or more line voltage options on a single product. Typically, matched to the line voltage when installing by capping off an unused load wire or moving a jumper or adjusting a dip swich.

Often the case on compressors, motors, pumps, transformers. Found in hot tubs, medical equiptment, roll up doors, fan motors, light ballasts, industrial equipment, etc.

Search for a wiring diagram of the product. Adding ".pdf" and the product name may yield technical documentation, normally enclosed with product packaging.

Then post it in this thread.

[Mr4btTahoe]

Someone asked that question on the amazon listing in the "Customer Questions" area. Says it works fine on 240.


I didn't see any mention of 208v but I'd say that is the "minimum" voltage it will operate correctly on yet is still a 230v appliance. You'll be fine as long as your inverter is a traditional split phase 60hz inverter which I believe it is.

[TaliaDPerkins]

While I thank you for your reply, of course I have looked in the offered manual and not seen the tolerance, and was in fact asking for the impression of those here about the wisdom of deliberately supplying the unit with an off nominal voltage, ie, 240VAC instead of 230VAC. Would it be best to put an autotransformer in to bring the 240 down to 230?


And secondly is it off base to use a 12kBTU/1ton unit in a 36' bus in the VA climate?


I have since found a tolerance for the 115VAC unit, it is +/- 10%. Still can't find a tolerance for the 208/230 unit's supply. However, the question has just become moot.


The AIMSPower inverters have a setting for 230VAC!


The remaining question is the wisdom of a 1 ton unit on an 18" roof raised 36' bus with approx 2" thick spray foam insulation without a lot of windows.

[melwade]

With the 230v do you expect to be offgrid? Do you forsee problems connecting to RV hookups?

[TaliaDPerkins]

My charger will be separate from my inverter. The inverter is able to simultaneously do 230VAC and split phase 115V. Idea is the 30A/50A 110~120VAC RV hookup is converted by the charger to charge the batteries when the solar input goes too low, and the inverter runs from the batteries. Also have a gasoline 7.5kW inverter generator for back up. (I'd have preferred a diesel inverter generator, but they aren't out yet in that size, apparently, at least not economically).

[Bert06840]

From a theoretical perspective, you are very likely to be alright.

From a practical perspective, you are even more likely to be alright.

I moved three times between Europe and the U.S. and have a large pile of 230V/50Hz gadgets that have been put to service on 208/60 and 240/60, and even more vice versa.

Running something on a higher voltage and lower frequency is the biggest *potential* problem, and even that is not a very big problem. I.e. running a skimpily designed transformer or motor made for 208/60 on 245/50 (in the U.K.) is not advisable as it may overheat.

But running a 208-230/60 appliance on 240/60 is going to be just fine, especially since a high end compressor might even be doing power inversion, and the higher frequency is easier on the supply. Even more, it will be designed for 50Hz and 60Hz markets, and 60 is easier on it than 50.

If the spec says it’s made for 50Hz markets as well, you are 100% ok running it at 240/60.

If your Aims can be set to 230/60 split phase, do that. You’re covering best of both worlds.

The autotransformer is not needed.