Question about inverter transfer switch

time2roll wrote:

Rocknxj wrote:
Just looked up UPS's, I'll get one ordered and plug the TV into it, and might as well plug a couple other things into it as well. Should solve the problem, and cheaper than replacing the inverter.

Please post what you get and how well it works.

OK, I got this UPS and it doesn't work.

AmazonBasics Standby UPS 400VA 255W Surge Protector Battery Backup, 6 Outlets


It works to keep the TV from shutting off when switching back and forth from inverter to generator, but it doesn't like the modified sine wave from the 458 inverter. The UPS stays on and charges up with the generator running, but it shuts off and sets an alarm for frequency beyond 47-63 hz when on just the inverter.

Anybody have a UPS that they know works with the Freedom 458 inverter or any other modified sine wave inverter? I can buy a new Freedom 3012 pure sine wave inverter with a 10 ms internal switching time, which should solve the problem on it's own. But, I was hoping that a $40 UPS would solve it.

time2roll wrote:

Rocknxj wrote:
Just looked up UPS's, I'll get one ordered and plug the TV into it, and might as well plug a couple other things into it as well. Should solve the problem, and cheaper than replacing the inverter.

Please post what you get and how well it works.

I ordered this one from Amazon. Got it, and I'll plug it in tomorrow to see how it works.

https://www.amazon.com/gp/product/B073Q48Z95/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

AmazonBasics Standby UPS 400VA 255W Surge Protector Battery Backup, 6 Outlets

Rocknxj wrote:
Just looked up UPS's, I'll get one ordered and plug the TV into it, and might as well plug a couple other things into it as well. Should solve the problem, and cheaper than replacing the inverter.

Please post what you get and how well it works.

You could be referring to the main transfer switch for the shore power, mine makes a click that can be heard. My understanding is that keeps shore power isolated from the on board power sources. There is also a transfer switch inside the inverter/charger. I found on the Freedom 438 that I have that the switch time is 25-40 ms. Like someone else here shared, my HD TV still clicks off but the other stuff I found is staying on. The newer pure sine wave Freedom 3012 has in internal transfer switch speed of only 10 ms which they say is fast enough to not disturb electronics. I have experience on a sailboat with the 3012 and none of the many electronics are disturbed when switching from inverter to genset and back, and the genset is on auto start. I was ready to buy a new 3012 inverter if needed, but using a UPS is a great idea and I have one ordered.

Mine does the same thing and has done so since new. I can hear the switch activating when switching over. Monaco techs said it's a safety feature built into the coach and is normal....Dennis

oldave wrote:
Try visiting IRV2 they have a forum for National RVs .
Someone there will probably know the answer .

I don't think my Monaco Windsor does as you describe .
I suspect the manufacturers wired coaches up differently
resulting in behavior like yours .

Ray

Thanks.....will do.

As I keep messing around with this, I've isolated that really just the HD TV is turning off when switching back and forth from inverter to generator. The DVR and the satellite box stay on. Just looked up UPS's, I'll get one ordered and plug the TV into it, and might as well plug a couple other things into it as well. Should solve the problem, and cheaper than replacing the inverter.

Now I need the batteries to not run down so fast when the inverter is left on. I just ordered an SG200 battery monitor system, the newest one from Balmar, which gives both accurate SOC and SOH and has Bluetooth. See how good my battery bank is. Probably go from 4 to 6 batteries.

Thanks for the info and ideas.

The OEM TS between shore cord and generator
Has a time delay before 'ON' to allow the generator to come up to speed and stabilize

When shutting down, the generator head will try to maintain voltage but it will drop, the TS will maintain/hold the contacts until the voltage has already dropped below the threshold needed for the modern power supplies in electronics to work
So the electronics are turned off power loss before the RV TS can switch over

I think it has to do with the efficient modern switching power supplies. Previously the old heavy transformer, diodes and large capacitors would carry the device as the power switch was made.

Whenever my generator starts while I'm on battery power my satilite receiver reboots and I have to wait to get the signal back. Aggrvating because everything else seems to switch without a blink.