Change to Lithium-ion?

larkyblast wrote:
Those chinese batteries sure look interesting.

Interesting is a good word. I don't know what the cable size is, and I guess you have to install your own connectors.

MrWizard wrote:

Then it would be 1/4 of that for a 12v drop in battery

actually it's 4 times that of a 12v battery.

Relion 48v 100ah. I'd post a link but on the phone it's difficult. I can post an exact number later.

road-runner wrote:
I think the WFCO bashing has gone too far. They have an undeserved bad reputation because they are rarely installed correctly, and a very deserved bad reputation from a horrible reliability history that can be traced to poor physical layout of the components. When sized correctly for the battery bank and connected to the batteries with wires that aren't pathetically undersized, the WFCO loaded sensing technique for SOC is more accurate than the no-load voltage sensing of the competitors, and the current-based fan operation anticipates the cooling need instead of reacting to it. The WFCO converters I've had supply their full rated output with marginal AC input, while the PD converters I've had taper their output if the waveform and voltage aren't right at the upper end of the specs.

If they'd fix the reliability issue and emphasize correct installation I think the WFCO converters would be the pick of the litter among the mainstream power converters.

OK say you had a 35 amp WFCO connected to 4x GC2 with 20' of #2 wire... Should that work?
How low does the battery need to be? 12.0 volts?
Mine still does not work.

OK at some point they do work because if I slam the low battery with my inverter and 150 amp load for 20 seconds the WFCO actually goes to charging at 14.4 volts.

No need to talk about twice getting stuck 12+ hours in boost mode at random after being plugged in a few days. Or not dropping to float after a week.

As if I was the only one... Not.

2oldman

How much of a voltage drop from full to 50% SOC
Then it would be 1/4 of that for a 12v drop in battery

2oldman wrote:

RCMAN46 wrote:


As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.

I'm not sure that's true of RV batteries. My 48v pack will show a voltage drop.

What batteries are used in your 48v pack. I mean manufacture and type or part number.

Those chinese batteries sure look interesting.

RCMAN46 wrote:


As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.

I'm not sure that's true of RV batteries. My 48v pack will show a voltage drop.

I have used LiFePO4 in radio control airplanes for the radio system batteries.
The LiFePO4 is very stable very little danger of fire if the battery is mistreated.

As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.Thus very difficult to determine if the battery is near its discharged state. They only way I know of is an accurate record of the volt amps used. There are instruments that can track the volt amps used.

Here is a device I use and has a 50 amp continuous rating. On draw back it has to be de-energized to reset the readings.

DC power meter

That's getting down to similar cost as an AGM.