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 > What size inverter do I need?

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jornvango

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Posted: 03/13/22 10:55pm Link  |  Quote  |  Print  |  Notify Moderator

Our Casita trailer has one Duracell AGM battery and a 100V Renogy portable solar panel. By 11 AM, the battery is typically 100% charged so we don't use all that much (I presume). Inside the RV, we use LED lights and other than that, the 3-way fridge and water pump use the RV battery, as well as us charging an iPad and cell phone by using the 12V outlet in the RV.

Now ... for charging my laptop while we're traveling, I bought a (cheap) 400W inverter at Walmart to plug into the RV's 12V outlet. Since the laptop charger is 90W, the solar panel barely keeps up while the laptop is charging during the day, but it works fine.

Question: I want to use my electric hair clipper, perhaps once every two weeks for 10 minutes, to keep my hair short. The hair clipper says on the back "120V AC 60Hz 8W".
When I plug it into the 400W inverter however, the blades don't move fast enough to cut my hair. It works but it hurts my head while cutting so I can tell it needs more 'power' to run faster as intended.
Can anyone tell me how big of an inverter I should get if 400W isn't enough?

Is it accurate to say that the hair clipper needs 120V and a 15-amp outlet so 120x15 = 1800W to run as intended and I only have 400W at the moment?

Thanks! (Yes, I'm challenged when it comes to electricity)

Jorn

pianotuna

Regina, SK, Canada

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Posted: 03/13/22 11:15pm Link  |  Quote  |  Print  |  Notify Moderator

Jorn,

Motors need pure sine wave inverters. Otherwise they don't run at full speed. Hence the clippers do not work properly.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

jornvango

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Posted: 03/13/22 11:55pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks. I've been debating buying a Jackery since that would be easy to keep charged while driving around in the car, and, the Jackery includes a pure sine wave inverter. Based on the above numbers for the hair clipper, what size Jackery would I need which (I assume) needs to output enough Watts for the hair clipper to run?

wa8yxm

Davison Michigan (East of Flint)

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Posted: 03/14/22 04:55am Link  |  Quote  |  Print  |  Notify Moderator

Inverters. be they MSW or PSW/TSW run around 85-90% efficient (Varies slightly model to model) so if you are putting out 1800 watts you are drawing about 2,000

So calculate the maximum load.. Add a bit for safety (I'd use at least a 2,000 inverter or a 1500 watt load) Figure motors may need as much as 5 times their rated wattage for starting (Or more in some cases)

That about covers it. 2,000 watt is what I used. Microwave OR coffee maker plus television/radio and a few tiny loads like LED night light or clock. .


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


JimK-NY

NY

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Posted: 03/14/22 06:29am Link  |  Quote  |  Print  |  Notify Moderator

Most hair clippers are now cordless. Problem solved for about $35.

2oldman

NM

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Posted: 03/14/22 07:05am Link  |  Quote  |  Print  |  Notify Moderator

jornvango wrote:

The hair clipper says on the back "120V AC 60Hz 8W"
8 watts?
JimK-NY wrote:

Most hair clippers are now cordless. Problem solved for about $35.
Good point.

Lwiddis

Near Mammoth, California

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Posted: 03/14/22 07:57am Link  |  Quote  |  Print  |  Notify Moderator

A Jackery is about as an expensive solution as you could find. (It’s a battery!) Add another solar panel and another RV deep cycle battery. Consider Lithium.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AMP Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


KD4UPL

Swoope, VA

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Posted: 03/14/22 05:24pm Link  |  Quote  |  Print  |  Notify Moderator

Modified sine wave inverters are like black and white televisions. You could buy one buy why?

theoldwizard1

SE MI

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Posted: 03/14/22 05:39pm Link  |  Quote  |  Print  |  Notify Moderator

KD4UPL wrote:

Modified sine wave inverters are like black and white televisions. You could buy one but why?

Given modern technology, there should less than $50 difference on a less than 1000W modified vs pure sine wave inverter.

TurnThePage

North ID

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Posted: 03/14/22 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

A Jackery is about as an expensive solution as you could find. (It’s a battery!) Add another solar panel and another RV deep cycle battery. Consider Lithium.
This is what I would do. If you could install the panels on the roof, it would be almost no maintenance or thought there after.


2015 Ram 1500
2004 Pioneer 18T6

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