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 > Battery recommendations for 1500W inverter

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BFL13

Victoria, BC

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Posted: 10/13/18 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

road-runner wrote:

BFL13 wrote:

I measure my voltage drop at the batteries with the Trimetric monitor. That includes the wiring and batteries for cause of drop at any amps. Of course the actual voltage 'seen' at the inverter is less across the wiring, but the drop seen is the same, just from a lower starting point.
If I may nitpick,the voltage drop in the wiring will increase as the battery voltage goes down. Assuming a constant load on the inverter, a 10% drop in the battery voltage will lead to a ~10% increase in the inverter's DC current draw. Most likely a much smaller factor than the battery voltage drop, so not much of a factor in the big picture.


Good point! Inverter "creep" as the voltage drops the amps go up to try to maintain watts.

I am trying to see how that works with inverter-gens too at 120v and 120 amps. Seems to be there, but I don't have much data yet.

All those electrons sure manage to keep busy [emoticon]


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MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 10/13/18 08:03pm Link  |  Quote  |  Print  |  Notify Moderator

Specifically you do not want Lifeline batteries if your vertical clearance is limited. If it isn't limited you can go with the extra tall Lifelines and get CCA and extra long life, plus Peukert superiority for low draw loads.

I have drawn 4500+ watts with my Trace inverter. Even six tons of wet cells draws down over a volt.

theoldwizard1

SE MI

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Posted: 10/13/18 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

My 4x GC2 from Costco have done just fine driving the microwave.

There is your answer.

beemerphile1

Ohio

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Posted: 10/13/18 09:21pm Link  |  Quote  |  Print  |  Notify Moderator

My setup;
Four Sam's Club GC2
2,000 watt PSW Xantrex inverter
8' x 2 of 2/0 cu cable


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MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 10/13/18 10:03pm Link  |  Quote  |  Print  |  Notify Moderator

-There is your answer-

If you are a clone and use the microwave like he does. How long can it drive a microwave? That is...

The Rest Of The Story...

Coffee warmup 3 minutes

Marie Callander pot pie 5 minutes

Big bowl of frozen vegetables 8 minutes

(2) Russet potatoes 13 minutes

pianotuna

Regina, SK, Canada

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Posted: 10/13/18 10:50pm Link  |  Quote  |  Print  |  Notify Moderator

LI would be best but are still far too expensive and can't be used in the cold.

AGM are next best.

Wire run to the battery bank needs to be short. Place the inverter as close as humanly possible to the battery bank without it being in the same compartment.

I was able to successfully power my microwave (1561 watts input) on 3 Marine jars. I can do it on two AGM's but of course do not do so.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Gottahaveit

Stockton CA

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Posted: 10/13/18 11:43pm Link  |  Quote  |  Print  |  Notify Moderator

syperk wrote:


Mostly I'm just looking for someone else running a 12V 1500W (or greater) inverter to get some insight into what battery setup they have.


Sorry but running your Microwave off batteries and inverter not going to happen unless you really want to put in alot of batteries. I would never even try and we have 6 T105's. Good luck


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Latviaman

Central Valley, Ca.

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Posted: 10/14/18 12:46am Link  |  Quote  |  Print  |  Notify Moderator

To the OP I just completed an install like you were asking. I have 2 Lifeline GPL-4CT 6 volt batteries. I installed a gopower 1500 watt pure sine wave inverter . The cables were 1/0 for all my cables. A total length of the positive cable was 1ft from battery to the fuse and 3ft to the inverter r. I have some done some minimum testing with a microwave just testing a cup of water for about 5 minutes in 1 minute intervals. I can’t remember my microwave size. I have a 2012 lance 855s. If I remember correctly the voltage dropped to about 11.5 when using the microwave. I hope this helps. I won’t be able to do any further testing for a while.

BFL13

Victoria, BC

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Posted: 10/14/18 07:24am Link  |  Quote  |  Print  |  Notify Moderator

One AGM advantage doing this, is their higher voltage per SOC in the first place. This means they can be used to run the microwave when at a lower SOC and still not hit the inverter's 11v alarm.

theoldwizard1

SE MI

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Posted: 10/14/18 07:30am Link  |  Quote  |  Print  |  Notify Moderator

beemerphile1 wrote:

My setup;
Four Sam's Club GC2
2,000 watt PSW Xantrex inverter
8' x 2 of 2/0 cu cable

The simplest thing for the OP to try is going to large cables.

You can buy pre-made cables on Amazon for less than less than $50 for 1/0 and less than $55 for 2/0

Swapping cables is a lot easier than trying to mount 2 additional batteries that would likely require large wire anyway.

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