48V Inverter Recommendation?
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danphillips
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I like the Magnum inverter / chargers
danphillips
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2800W 12VDC Pure Sine Inverter Charger MS Series | Magnum Dimensions
John Frum
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I'm thinking about 48V for a cargo trailer conversion with 7200Wh storage and 1200W solar, mainly for the ability to run a mini split heat pump system. The sensible option might be to settle for a 24V system as there are more RV appliance options for 12/24V. Just curious about 48V as it's more efficient. Split phase would give me some nice options on the mini split though - just gets really expensive.
John Frum
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Most of the 48 volt inverter/chargers/transfer switches will be split phase.
Which is a consideration if you are going to make provisions for shore power.
Another consideration related to shore power is a switchable neutral/ground bond.
One more thing to consider is low frequency vs high frequency.
Low freguency inverters are heavy and expensive but they handle surge loads much better.
For a 3000 watt inverter 12 volts isn't really a good choice but 24 volts is ok.
Hope that helps.
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Yes a lot to consider, but I think I'm probably going to go with 24V/3000W. Thanks for the good advice - hadn't considered the neutral/ground bond - I have a lot to learn - my thinking was more along the lines of a big Frankenstein switch for shore power
John Frum
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Yes a lot to consider, but I think I'm probably going to go with 24V/3000W. Thanks for the good advice - hadn't considered the neutral/ground bond - I have a lot to learn - my thinking was more along the lines of a big Frankenstein switch for shore power
The neutral/ground bond is a very important life saftey detail.
Glad to bring it to your attention.
D
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The Aims 6,000 watt 48 volt inverter connects/disconnects the neutral ground bond automatically when you connect to shore power. Easy.
Sounds expensive. It seems that 48V stuff is a little out of my range for an RV. Looking at the ROI a 24V system hits the sweet spot. I think I can do a 24V/1200W(solar)/2-3k inverter/7200Wh system for just over $4k. Prove I’m wrong
Doubting Thomas! Only proof is to do it, I’m not counting money I’ll spend making mistakes but on paper I think it’s feasible.
Okay let us know when you are done ;-)
There are plenty of cheap options out there if that's how you want to go -- but your battery need is probably only doable with used junk or golf cart batteries.
Well I'm just a noobie poking around for information but I think Will Prowse is a trustable source and I found this on his site: http://s.click.aliexpress.com/e/KuqogXnE thats 7680Wh for about $1800. Not saying that's the way I'll go but it puts me below budget. His 24V design with diy battery bank would put me at around $3800, need to add an ats to that so around $4K. Of course I could kill myself in the process.....
I like your enthusiasm. Why don't you get an inverter/charger with the transfer switch built into it? Just curious. Or an MPP Solar unit.
From the information I have, it seems that the all-in-ones in general and the MPP in particular have a high standby current and not recommended for extended inverter use. I would be running a heat pump on inverter all the time with hopefully most of time on standby. Will Prowse mentioned in one of his videos that you would need 400W solar just to run standby.
I think you are on the right track, I'm excited to see how your build develops.
I also think you are making good decisions going with 24v for a mobile build, and avoiding the All-in-one.
I also think you are making good decisions going with 24v for a mobile build, and avoiding the All-in-one.
True. Thanks for reminding me of that. I did see Wills video. Sometimes I forget how valuable every amp is when designing a solar system. I live in an apartment and there isn't enough sun to do much of anything although I eventually want to experiment. What I am thinking of building is more along the lines of a "portable" UPS and keeping in mind I may want to add solar in the future.
