Inverter Pure Sine Size

Submitted: Saturday, Feb 03, 2018 at 08:09
ThreadID: 136208 Views:1124 Replies:8 FollowUps:7
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I have been lucky enough to have been given 2 new pure sine inverters, both manufactured by Redarc. One is 300w the other is 1000w. Can anyone suggest which one I should use in my 4wd please. Main use would be for charging Samsung laptop, AA batteries and a cryovac machine.
It will be permanently hooked up to a 85amph century which has a 60L Waeco running off of it as well as a LED light.
Many thanks
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Reply By: Member - Alan H (QLD) - Saturday, Feb 03, 2018 at 08:13

Saturday, Feb 03, 2018 at 08:13
I have a 300 in my vehicle and have 1800 in our van. 300 will do charging duties.
Alan
AnswerID: 616618

Reply By: Member - Stephen L (Clare SA) - Saturday, Feb 03, 2018 at 08:13

Saturday, Feb 03, 2018 at 08:13
Hi Cruiser

Well done on receiving those two great units.

If it was just for the laptop and battery charging, the 300w will do it with ease.

As for the cryovac machine, how many watts does it draw?

That will be the determining factor,






Cheers



Stephen
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AnswerID: 616619

Reply By: Crusier 91 - Saturday, Feb 03, 2018 at 09:20

Saturday, Feb 03, 2018 at 09:20
Thanks for the replies so far.
Stephen, I haven't purchased a cryovac as yet. guess I would have to match output with inverter
AnswerID: 616621

Follow Up By: Bob Y. - Qld - Saturday, Feb 03, 2018 at 09:36

Saturday, Feb 03, 2018 at 09:36
Just checked our Sunbeam VS-550, Cruiser, and it's 150w.

Bob

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Follow Up By: RMD - Saturday, Feb 03, 2018 at 09:37

Saturday, Feb 03, 2018 at 09:37
Aldi One is 120W. So 300 watt inverter should work it ok.
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Reply By: HKB Electronics - Saturday, Feb 03, 2018 at 12:09

Saturday, Feb 03, 2018 at 12:09
Personally I would put the 1000W unit in, I have a similar unit and use it to run a power drill, dremel etc when required.
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Follow Up By: AlbyNSW - Saturday, Feb 03, 2018 at 12:52

Saturday, Feb 03, 2018 at 12:52
Won't the bigger inverter more drain your batteries quicker? Are you better having one just big enough to meet your needs for this reason or do the newer Pure sine wave units only draw power according to the load on them?
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Follow Up By: RMD - Saturday, Feb 03, 2018 at 13:10

Saturday, Feb 03, 2018 at 13:10
Alby
Apart from their own internal circuitry each inverter drawa power according to it's load. Maybe the bigger one under load is more efficient at switching and converting 12v to 240 and so will use less power with the same load.

I would always fit one with a battery isolator so it isn't electrically connected until required.
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Follow Up By: HKB Electronics - Saturday, Feb 03, 2018 at 14:08

Saturday, Feb 03, 2018 at 14:08
Big unit doesn't use much more than a smaller idling, my unit has an on off switch, would only draw a few millamps when turned off.
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Follow Up By: AlbyNSW - Saturday, Feb 03, 2018 at 15:40

Saturday, Feb 03, 2018 at 15:40
Thanks for the heads up, I am looking to purchase a unit and was looking at the smaller end of the scale (300w) so that it wasn't too hard on my batteries
I may as well go bigger then as they are not much more expensive
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Follow Up By: Allan B (Sunshine Coast) - Sunday, Feb 04, 2018 at 00:47

Sunday, Feb 04, 2018 at 00:47
.
Alby, although a larger inverter will not waste much more power on small loads, unless you forsee a need for a large inverter you may do better with a 300W size. It is cheaper to purchase and smaller to carry.
Large (1000W) inverters when supplying large loads use a lot of battery power (80A). Unless the alternator is running this can soon deplete your battery and take considerable time to recharge it.

Whatever size you purchase, be sure it is Pure Sine Wave as any other type will likely not work with some of your loads.
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Reply By: Mick O - Saturday, Feb 03, 2018 at 14:03

Saturday, Feb 03, 2018 at 14:03
If you've got the room, install the 1000W unit. Just so handy especially in a crisis when you might need to run a grinder drill or other electrical tool/appliance. It will handle all the charging duties although for phones etc, you'd only need a small 150W beer can type inverter.

I run the Redarc 1500W these days for just that reason. Handles the breadmaker as well (which a 1000 will do comfortably).

Cheers

Mick
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Reply By: Gronk - Sunday, Feb 04, 2018 at 11:27

Sunday, Feb 04, 2018 at 11:27
I'd use the smaller one, and if you found a need for the bigger one, have it setup so you can easily hook it up temporarily ..
The only thing I need an inverter for is camera batts, the phone and tablet or laptop charge off 12V.
If you need a cryovac machine, I presume you are on the road all the time......if not why not use it at home before you leave on trips ?
AnswerID: 616653

Reply By: Malcom M - Monday, Feb 05, 2018 at 06:28

Monday, Feb 05, 2018 at 06:28
You already have them at zero cost so install the bigger one and you are covered for unknown requirements.
Both draw similar quiescent current but then you only notice this when you turn it on...
AnswerID: 616675

Reply By: The Bantam - Tuesday, Feb 13, 2018 at 22:27

Tuesday, Feb 13, 2018 at 22:27
A very real consideration is how big the supply cable will need to be.

The 300VA inverter will draw around 25 amps

the 1000VA inverter will draw somewhere around 85amps

that makes the cable required considerably bigger for the larger unit, particularly if you intend mounting the inverter some distance from the battery.

the 1000 VA inverter will be drawing about what a starter motor draws on a free cranking 4 cylinder.

cheers
AnswerID: 616903

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