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ktmrfs

Portland, Oregon

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Posted: 09/20/22 07:26pm Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

As they said 300 watts for Entainerment/computer only

1500 is the absolute minimum for a Microwave I'd go with 2,000


Panasonic true inverter microwaves run just fine on a 1000W inverter if you set power to 50% max. Done that for 8 years now. yes, things take a bit longer (maybe 50%) to heat, but that's it. 50% is drawing about 750-800VA, you can actually go to 70% or so if you have a big enough battery bank and are reasonably charged. 50% works on a set of 4GC2's discharged to around 50-60%.

Now a conventional microwave, yes 1500W minimum.


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StirCrazy

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Posted: 09/21/22 06:41am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

1800 watts for single hi draw items such as an induction hob.

300 watts for tv, computers, and cell phone charging.


you running two inverters PT? I just want one but I want to size it so I cannot draw full current through the BMS on the new battery. its for the camper not the 5th wheel, I have a 2000 watt inverter in the 5th but a 2000 watt inverter can pull 166 amps and I am only using a 150 amp BMS on this one. when I do another then I can handle twice that with two batteries.

right now I have no need for AC in the camper aside from charging phones which I can do with DC, but I thought it might be nice to use the electric toaster (700 watts) once and a while and if we decide to keep this old camper instead of upgrading to a newer one then maybe add some other stuff. if I can find a decient 1500 watt pws inverter that will draw 125 amps max for a reasonable price here in canada that might be what I am looking for.

* This post was edited 09/22/22 07:54am by StirCrazy *


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pianotuna

Regina, SK, Canada

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Posted: 09/21/22 02:32pm Link  |  Quote  |  Print  |  Notify Moderator

my microwave draws 1565 watts. 1500 is not going to cut it for me.


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dodge guy

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Posted: 09/21/22 02:51pm Link  |  Quote  |  Print  |  Notify Moderator

Just got a 3000W inverter for my MH. It’s only to run outlets and maybe the microwave on the road. I only have 2 batteries, but will never pull the full wattage. It when it comes time for batteries I’m thinking 3 100Ah LifePo batteries.


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StirCrazy

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Posted: 09/22/22 07:53am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

my microwave draws 1565 watts. 1500 is not going to cut it for me.


wow, is that a comercial restuarant model? I havent seen one rated over 1100 and that being one of the biggest ones, most I see are 900 to 1000.

StirCrazy

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Posted: 09/22/22 08:00am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

Just got a 3000W inverter for my MH. It’s only to run outlets and maybe the microwave on the road. I only have 2 batteries, but will never pull the full wattage. It when it comes time for batteries I’m thinking 3 100Ah LifePo batteries.


ya I am building my own LiFePO4 so using 320AH cells which is great for the amount of capacity available from one battery , but to get a good quality BMS that will handle 3000 watts gets a little pricy. Im already going higher than my last battery by using a 150amp bms. my original plan was to use a 120 and save 30 bucks but I decided when I build a second one they will handle a 3000 watt inverter no problem so for the 5th wheel they will run cool on a 2000 watt inverter.

I was also looking at the smaller inverter waist less power while they are on but not being used so there is a efficicency thing I am looking at also.

ktmrfs

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Posted: 09/22/22 09:00am Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

pianotuna wrote:

my microwave draws 1565 watts. 1500 is not going to cut it for me.


wow, is that a comercial restuarant model? I havent seen one rated over 1100 and that being one of the biggest ones, most I see are 900 to 1000.


Microwaves have two spec's on "watts". the advertized one, which is usually the OUTPUT power, then on the back plate the actual power draw from the line. The first is commonly in the 1000W range, the second is usually in the 1300-1500 watt range. At least in the U.S. if current draw exceeds around 12A they need to be equipped with a 20A plug rather than the common 15A plug. That pretty much limits them to 1500 or so watts actual power draw.

Then there is the power draw and VA. Since they are not a resistive device and usually no power factor correction, the current draw (which inveters care about) will usually be higher than derived from assuming a resistive load.

StirCrazy

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Posted: 09/23/22 06:44pm Link  |  Quote  |  Print  |  Notify Moderator

ktmrfs wrote:

StirCrazy wrote:

pianotuna wrote:

my microwave draws 1565 watts. 1500 is not going to cut it for me.


wow, is that a comercial restuarant model? I havent seen one rated over 1100 and that being one of the biggest ones, most I see are 900 to 1000.


Microwaves have two spec's on "watts". the advertized one, which is usually the OUTPUT power, then on the back plate the actual power draw from the line. The first is commonly in the 1000W range, the second is usually in the 1300-1500 watt range. At least in the U.S. if current draw exceeds around 12A they need to be equipped with a 20A plug rather than the common 15A plug. That pretty much limits them to 1500 or so watts actual power draw.

yes, I thought he was talking about the output when I saw that. my 1100 watt one only draws 1200 watts which also had me wondering.

Then there is the power draw and VA. Since they are not a resistive device and usually no power factor correction, the current draw (which inveters care about) will usually be higher than derived from assuming a resistive load.


pianotuna

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Posted: 09/23/22 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

Mine was measured with a Kill-a-Watt meter--which has been checked against a seriously expensive meter.

It is a Dometic.

time2roll

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Posted: 09/23/22 09:01pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Mine was measured with a Kill-a-Watt meter--which has been checked against a seriously expensive meter.

It is a Dometic.
1565 watts but did you measure power factor?

I think the PF killed my Prosine 1800 prematurely.


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