Kisae SW2420 PSW Inverter 24VDC-120VAC

[brulaz]

Just got it and opened it up. Haven't tried it yet.
Manual: http://www.kisaepower.com/wp-content/uploads/2016/07/SW2420-Series-REV-B.pdf

The construction looks pretty solid to my untrained eye.
Not sure about the electronics. Lots of LG branded capacitors.

A couple of pictures:

[brulaz]

2oldman wrote:

...
I found there's less battery heating and better efficiency. Trying to run air on 12v was scary- lots of heating in all components. 24v was better, but 48 is a piece of cake. The less amps you can deal with the better.

I think as the conversion difference is smaller, the efficiency is better. Although I will add that the idle current for my 4k 48v inverter is much more (although still insignificant) than a 12v unit.

Well, we're not going to be running AC. Even when there's shore power we'd rather just use a 35W floor fan to keep cool. And if it gets worse than that, it's time to move further North. We're Snowbirds after all. The main reason for this whole RV thing is to track the seasons. If I wanted to stay down in Florida/Arizona all year, I'd buy a house.

And we'd have to get a bigger trailer if we decided to use much more electrical energy. 4 GC2s are close to the max on our tongue, and even this 2000W Kisae inverter is a pretty large. I'll probably have to move some stuff from the pass-thru to the truck's bed just to free up space for air-flow. Anything larger would be a bigger problem.

Currently we just turn off the 1000W inverter when we're not using it. But I'm curious how the Kisae's less than 100ma stand-by mode will work with our 120VAC usage. Apparently it wakes up every few seconds, and if there's greater than 10W load it stays on until the load drops to 3W, when it goes back to stand-by. The Microwave might not like this. We'll see. But even when this mode is turned off, the draw isn't bad, less than 600ma. Or we could just turn it off like we do now. We're not running a frig or anything essential like that on it. Not yet anyway.

[2oldman]

brulaz wrote:
EDIT: Especially as 6 GC2s won't work with 24V.

So there could be more Peukert's, battery heating and conversion inefficiencies as well.

Correct.. I was harkening back to my 12v days. You'd need 12v batteries to make 6 work.

I found there's less battery heating and better efficiency. Trying to run air on 12v was scary- lots of heating in all components. 24v was better, but 48 is a piece of cake. The less amps you can deal with the better.

I think as the conversion difference is smaller, the efficiency is better. Although I will add that the idle current for my 4k 48v inverter is much more (although still insignificant) than a 12v unit.

[brulaz]

2oldman wrote:

brulaz wrote:
But I'm a bit worried about what will happen now, with the new 2000W Inverter.

I found that 6 GCs was a sweet spot for charging vs usage for that size inverter.

Not exactly what I wanted to hear.:(

EDIT: Especially as 6 GC2s won't work with 24V. Need either 4 or 8 or change the voltage to 36V or back to 12V. Nope.

Oh well, this whole thing is a learning experience. It will be interesting to see how it works out for us with our usage patterns.

Since upgrading to 700W solar, 440Ah battery and 1000W inverter, the lowest est. SOC has been about 70%.

With the 24V system and 2000W inverter, we'll get more peak solar, but will have also doubled the potential peak loads with the big inverter. So there could be more Peukert's, battery heating and conversion inefficiencies as well.

We'll see, but I do expect to see 50% SOC more often.
EDIT: And after reading another discussion, that's prolly not going to be a problem. Think I've been way too conservative in working these batts.

And maybe with next years tax rebate, a 300W portable solar system might be possible.:)

[brulaz]

BFL13 wrote:
What is the composition of the 700w of solar? I missed that somewhere.

If it is using 24v 60 cell panels the highest voltage you will get is 30v, based on my testing with 24v battery bank and a 60 cell panel. Doesn't matter what the MPPT controller can do as such, it is the 60 cell panel limit. 30v is plenty for recharging, but not enough to equalize.

You are ok to get to equalize levels with 24v 72 cell panels or using 12v 36s in series to be 24v.

Good point. I forgot about that.

But my panels are all 72 cell with Vmp of ~36.6V so on a bright sunny day they should do the trick.

[2oldman]

brulaz wrote:
But I'm a bit worried about what will happen now, with the new 2000W Inverter.

I found that 6 GCs was a sweet spot for charging vs usage for that size inverter. You better be using more power!

[BFL13]

What is the composition of the 700w of solar? I missed that somewhere.

If it is using 24v 60 cell panels the highest voltage you will get is 30v, based on my testing with 24v battery bank and a 60 cell panel. Doesn't matter what the MPPT controller can do as such, it is the 60 cell panel limit. 30v is plenty for recharging, but not enough to equalize.

You are ok to get to equalize levels with 24v 72 cell panels or using 12v 36s in series to be 24v.

[brulaz]

colorado.com wrote:
As the highest paved road in North America, Mount Evans Road rises to a height of 14,130 feet above sea level

Guess we can't go there! :B
It's a shame, cause I'm sure there's lots of good solar.

[brulaz]

2oldman wrote:
Good thinking on the 24 v 12 charging. 700w should easily handle 2 batteries (2- right?).

Originally 440 Ah at 12V with 2 banks of 2 GC2s.
But soon 220 Ah at 24V with 4 GC2s in series.

In the past we've been quite conservative in our electrical usage. Usually didn't get below 12.3V at rest or 70% SOC with the 12V setup. Only very rarely down to 50% SOC.

But I'm a bit worried about what will happen now, with the new 2000W Inverter. Expect we'll be seeing more dips to 50% SOC and running more days at lower SOC.

But we're not full-timers, only snow birds and don't boondock all the time, or for more than 2 weeks (so far), so hopefully the batteries will survive.

[2oldman]

time2roll wrote:
Operating Altitude Up to 9,843ft (3000m) above sea level

Well that *is* weird.

[time2roll]

(sorry it is altitude)


Safety and Environmental
Conformance cETLus CE EMC & LVD
Agency Markings ETL CE
Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -20°C to 60°C (-4°F to 140°F)
Relative Humidity 5-90% noncondensing
Operating Altitude Up to 9,843ft (3000m) above sea level

[2oldman]

time2roll wrote:
Specification sheet mentions the max elevation.

My control-F search found no reference to elevation in the first post's link. The capacitors blow up?

[2oldman]

Good thinking on the 24 v 12 charging. 700w should easily handle 2 batteries (2- right?).

Should you need a 24v charger PM me.

[MEXICOWANDERER]

Owner gets oxygen starvdd - presses wrong button

[time2roll]

MrWizard wrote:

time2roll wrote:
I like the no load draw and the tight load sense ratings.
What happens above 10,000 feet elevation?

is NOT A GENERATOR no carb no oxygen use, NO FUEL, NO worry

Specification sheet mentions the max elevation.