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Freedom 25 low voltage

Yahoo Message Number: 90004
I have a Freedom 25 (2500w) MSW inverter that for the most part works great. My batteries are relatively new and I monitor them closely. When using the microwave, the battery voltage will drop down from around 12.4 to 11.7. Does that sound right? I have 4 6v golf cart batteries.

Jim

99' Magna #5629

Re: Freedom 25 low voltage

Reply #1 –
Yahoo Message Number: 90023
Jim,

That pretty much coincides with my experience. Magnum inverter w/ 4 golf cart batteries. For that reason, I don't use my microwave on inverter for much more than heating a cup of coffee. More than that and I fire up the generator or use shore power.
Jim Barber
'87 LTD, 4223
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Re: Freedom 25 low voltage

Reply #2 –
Yahoo Message Number: 90037
Keeping this kinda simple (it's actually more complicated) a fully charged set of batteries should be 12.8 volts (no load). Your batteries are considered fully discharged at 10.5V. So on the surface your batteries look OK. The real test is how long they last. If you have Trojen 105'sa they should provide 115 minutes of 70A discharge (golf cart spec). A 800W uWave will draw around 70A to 80A from your batteries.

Judy n Joe

98 Intrigue 10578

Re: Freedom 25 low voltage

Reply #3 –
Yahoo Message Number: 90039
12.6 resting dcv is considered a full charge of a 12v battery. 11.7V is considered to be 40% of full resting charge or 60% discharged.
Observing the voltage on a voltmeter while your inverter and other systems are running does not provide a "resting" no load voltage reading.
If your voltage reading rises after turning off the inverter, then the removal of the heavy draw will provide a better assessment, but not accurate, of your battery's state of charge. The reason is you probably still will have systems drawing power when the inverter is off.
A web search for "resting voltage" will explain better than this amateur can.
My GC batteries, about to be replaced, drop to 11.7 when I turn on a few banks of florescent lights. They will not carry a heavy volatage draw load like a hair dryer.

Dean

95 Magna 5280
 

Re: Freedom 25 low voltage

Reply #4 –
Yahoo Message Number: 90062
Thanks to all that replied.

Sounds like this is pretty normal behavior for my setup. The voltage goes back up after the load is removed, I was just surprised at how low the voltage got. The microwave also takes significantly longer. I wonder how low the AC voltage is? If too low, I would guess I risk causing damage to the microwave. Would adding 2 more golf cart batteries lessen the effect? What was the point of CC using a 2500w inverter? Which loads were they designing for?

Jim

99' Magna #5629