Inverters 24V or 48V

[ArranP]

At home I am off-grid and have several 48V inverters operating in parallel.

My Lagoon 560 ( which sang so I am having to replace everything ), I am replacing the deisel generator with inverters operating in parallel.... the existing DC equipment is 24V however my preference and experience is with using 48V.

When using 24V I would need use twice as many inverters and batteries.

When using 48V it means
i, moving away from the standard equipment e.g. LED lights, pumps, winches, windlass, tenderlift etc.,
ii, keep the existing 24V equipemnt ( some items are 2-3kw / 125Amps ) but install a smaller 24V with a a battery charger from the 229V AC or direct from 48V DC battery.installing a step-down converter.

I would welcome any suggestions and comments as I am still after several months undecided.

One idea is to put a small 24V battery to take any surge from the high-draw items, and then a charger connect to the 48V battery. But do I use a small 24V Lead acide or gel, or stay with LiFePo4, and how many Ah should it be ? for example for a single 24V 125Ah be enough with several 48V/24V 30amp chargers for redundacy ?

Or abandon the idea of 48V and just go wtih 24V inverters and batteries...

Thank you.

[more]

Originally Posted by ArranP

At home I am off-grid and have several 48V inverters operating in parallel.

My Lagoon 560 ( which sang so I am having to replace everything ), I am replacing the deisel generator with inverters operating in parallel.... the existing DC equipment is 24V however my preference and experience is with using 48V.

When using 24V I would need use twice as many inverters and batteries.

When using 48V it means
i, moving away from the standard equipment e.g. LED lights, pumps, winches, windlass, tenderlift etc.,
ii, keep the existing 24V equipemnt but install a smaller 24V with a a battery charger from the 229V AC or direct from 48V DC battery.installing a step-down converter.

I would welcome any suggestions and comments as I am still after several months undecided.

Thank you.

Easy way stay on 24v. and DC-DC 24 to 12v for electronic and some small current equipment. but you limited 3000-5000W inverter

Hard way 48v have only problem windlasses and this is now easy possible solve if you want change windlasses. if you have eletrich winch,problem

[ArranP]

Originally Posted by more

Easy way stay on 24v. and DC-DC 24 to 12v for electronic and some small current equipment. but you limited 3000-5000W inverter

The inverter ( SOROTEC REVO VM II 3kw ) can each be connected ( upto 9 ) in parallel so providing 3,6,9,12kw and so on... so no real issue here. Only that double the amount of inverters are needed and space when compared to using 48V.

http://www.sorotecups.com/product-detail/revo-vm-ii/

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how much is old your boat.

[ArranP]

Originally Posted by more

how much is old your boat.

not for sale, being refurbished for family.

[more]

Originally Posted by ArranP

The inverter ( SOROTEC REVO VM II 3kw ) can each be connected ( upto 9 ) in parallel so providing 3,6,9,12kw and so on... so no real issue here. Only that double the amount of inverters are needed and space when compared to using 48V.

REVO VM II Series Off Grid Energy Storage Inverter

this is totally crap of inverter. maybe work 2-3 season if work 20-30% percent capacity max. little better crap http://mppsolar.com/

lot better inverter https://www.epever.com/product/ipowe...wave-inverter/

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But lagoon 56, minimum you can buy Victron phoenix inverter or real thru off grid inverter like SMA Sunny Island 8.0H

[ArranP]

I figure I need upto 10KW for the AC circuit at any one time.

At my home ( off-grid ) I use 48V inverters, I have 2x 5.5KW operating in parallel to provide 11KW so on the boat if using 24V inverters then I would need 4x 3KW.

[PaulCrawhorn]

If you think 48V is worth the extra headaches, use that for your inverters and maybe other high aml loads like windlass

Use that as your primary House bank target for all charge sources.

Then just have a smaller supplementary 12V House bank and put in a DC-DC charger to keep it topped up from the 48V bank.

[markcouz]

The Sorotec inverter in your link is actually a rebranded Axpert inverter manufactured by Voltronic.

They are not "crap" at all as someone stated, they have evolved over the last few years to be pretty good and programmable for LiFePO4 charging, but they are not quite up there with Victron.

Axpert manufacture a 5kW 48v (which can also be run in parallel) which is a much better voltage to use when getting up to the kind of power that you are after, otherwise the currents involved start to get crazy.

[PaulCrawhorn]

What is a "solar inverter"??

[PaulCrawhorn]

Originally Posted by ArranP

I am replacing the deisel generator with inverters operating in parallel

This makes no sense to me, completely different functions. What will actually provide energy while off grid for weeks at a time, if not a generator?

Huge alternators do exist, but will you be motoring a lot every day?

Solar will be supplementary at best at these huge energy requirements.

[more]

Originally Posted by markcouz

The Sorotec inverter in your link is actually a rebranded Axpert inverter manufactured by Voltronic.

They are not "crap" at all as someone stated, they have evolved over the last few years to be pretty good and programmable for LiFePO4 charging, but they are not quite up there with Victron.

Axpert manufacture a 5kW 48v (which can also be run in parallel) which is a much better voltage to use when getting up to the kind of power that you are after, otherwise the currents involved start to get crazy.

O yes, totally crap. and today lot this inverter coming with used MOSFET inside.

So many clone on market best option don't buy.
again if this inverter work 5-30% power survive maybe a couple of year.

[Pete7]

Originally Posted by more

O yes, totally crap. and today lot this inverter coming with used MOSFET inside.

So many clone on market best option don't buy.
again if this inverter work 5-30% power survive maybe a couple of year.

What evidence do you have to support this?

[Steve_C]

WHY do you think you need twice the equipment for 24 vs 48v????

Voltage is irrelevant to total battery capacity, so should be the same with either one. The inverters can be two Victron 24/5000.

Keep it 24V!