Good Sam Community

pianotuna · ‎Mar-14-2019

Hi all,

I'm back in the RV for a road trip. I had disconnected the Magnum from the battery bank for storage. I forgot to reconnect.

The Magnum would not pass 120 volts without being connected to the battery bank.

It (and I) survived.

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.

jharrell · ‎Mar-16-2019

Just tried the disconnect on my Magnum 3012, still letting 120v through with no battery, also seemed to be outputting 13.2v float. Perhaps it won't switch AC disconnect on with no battery? Need to investigate further, manual makes no mention of requiring battery for anything.

2016 Winnebago Vista 31be - Blue Ox Rear Track Bar - Centramatic Wheel balancers
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar

pianotuna · ‎Mar-15-2019

Hi time2roll,

I have disconnect switches--the Magnum does have a parasitic load--so I disconnect for long term storage. I simply forgot to turn it back on. mea culpa.

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.

time2roll · ‎Mar-15-2019

Why disconnect in storage? Why not just connect the Magnum back up before you roll?

2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

pianotuna · ‎Mar-15-2019

It is just another reason to do a "patch board" installation.

I can move plugs and in 20 seconds bypass the Magnum altogether.

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.

2oldman · ‎Mar-15-2019

Yes, that makes sense.

"If I'm wearing long pants, I'm too far north" - 2oldman

GordonThree · ‎Mar-15-2019

Somewhere in the manual, I'm pretty sure I recall a warning to never connect the 120v supply without the 12v supply already hooked up.

Glad to hear there weren't any fireworks.

2013 KZ Sportsmen Classic 200, 20 ft TT
2020 RAM 1500, 5.7 4x4, 8 speed

pianotuna · ‎Mar-15-2019

wa8yxm,

No there was twelve volt power to the Magnum remote. Just not to the charge and discharge terminals on the Magnum.

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.

wa8yxm · ‎Mar-15-2019

If I had to guess I'd say it is like the Air Conditioner. Now if your A/C has a Wall Thermostat of if it is a Carrier Air V with a I/R Remote... YOu need 12 volts for CONTROL.. Same with the inverter more than likely.

NOT all are like that.

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

BFL13 · ‎Mar-15-2019

This came up before when it turned out that you can't run the 12v off the charger in an inverter/charger like you can with a converter and no battery. It seems the inverter/charger needs 12v from the battery to operate at all.

Another good reason to have separate inverter and converter.

1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

jharrell · ‎Mar-15-2019

Interesting I thought it would function if it had either 120 or 12, not good if something happens to 12v but need 120v and have the whole coach running through the inverter like me.

2016 Winnebago Vista 31be - Blue Ox Rear Track Bar - Centramatic Wheel balancers
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar

Good Sam Community

An observation about Magnum hybrid inverters