Good Sam Club Open Roads Forum: Battery charging question.
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pianotuna

Regina, SK, Canada

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Posted: 02/16/21 06:25pm Link  |  Quote  |  Print  |  Notify Moderator

wopachop,

Don't feel dumb. We all learn here. And you are doing a service to the OP, too!

So thanks for checking it out for all of us.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

time2roll

Southern California

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Posted: 02/16/21 09:06pm Link  |  Quote  |  Print  |  Notify Moderator

I believe the trick is to get the converter voltage to sag to 13.0 or lower during initial charging. This is actually very difficult even with #2 wire connecting the battery. BTDT. The battery voltage actually pops up fairly quick at 60 to 70 amps plus the voltage drop in the wire and the WFCO is doomed.

If I fire up the inverter/MW pulling 160+ amps while the WFCO is charging it will shift right into boost mode.

Yes I believe the WFCO is supposed to give about 15 minutes of boost mode about every 24 hours and is probably what you were seeing. And that brings me to another story of getting stuck overnight at 14.4 volts boiling my batteries away. Did this more than once. I had to give up at that point.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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Matt_Colie

Southeast Michigan

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Posted: 02/17/21 09:03am Link  |  Quote  |  Print  |  Notify Moderator

Panhandle and Wopachop,

Please do not mislabel yourselves. There is no fault in being uneducated to some very specific subjects. I lucked out here. I sailed a number of long quiet watches with a man that survived WWII in submarines. In that situation, batteries were their life. I learned a lot from him and probably missed 15~20% of what he tried to pass along.

One thing that I did have to learn on my own to cure my own issues with charging the house bank was the wire size is really important and none of the tables work. Those tables are all for a 3% voltage drop. At 14V, that is about 0.4V. With the entire life of a lead/acid battery being between 11.9 and 12.6 volts, you can't take a hit like that. The difference in recovery time for a pair of GC2s being charged at only 14.0V verses 14.4 is real close to forever.

Matt


Matt & Mary Colie
A sailor, his bride and their black dogs going to see some dry places that have Geocaches in a coach made the year we married.


wopachop

Who run bartertown

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Posted: 02/17/21 09:20am Link  |  Quote  |  Print  |  Notify Moderator

My WFCO went into boost mode this morning for 30 mins. I noticed my voltage display said 14.7v. Ran outside to measure charge amps. What weird is that 1amp was leaving the battery. So i must have gone outside right when the charge had stopped.

I also had my solar hooked up. At the time it was giving 2amps to the batteries. I think that is what must have kept the batteries above 14v when i ran outside and measure charge amps from the converter.

Was worried for a second!! Had just got done reading about the converter getting stuck at 14.4v.

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PanhandlePlainsman

Texas

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Posted: 02/17/21 10:03am Link  |  Quote  |  Print  |  Notify Moderator

I'm still reading all of your posts. All are appreciated. Too cold here this week to do any work on it. Many thanks!

I will need to price some of these upgrades out to see what works best for me. I do plan to get some brand of 2000-2500 watt generator. I would plan to run it 2-3 hours per day as needed when boondocking occasionally. Looking for best battery and converter choices for the money.


PanhandlePlainsman 2014 F350 4wd KZ Durango 1500

pianotuna

Regina, SK, Canada

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Posted: 02/17/21 03:21pm Link  |  Quote  |  Print  |  Notify Moderator

PanhandlePlainsman wrote:

I'm still reading all of your posts. All are appreciated. Too cold here this week to do any work on it. Many thanks!

I will need to price some of these upgrades out to see what works best for me. I do plan to get some brand of 2000-2500 watt generator. I would plan to run it 2-3 hours per day as needed when boondocking occasionally. Looking for best battery and converter choices for the money.


Hi PanhandlePlainsman,

For Battery charging a 1000 watt generator will be fine (with lead acid). 2000 watts is an 'inconvenient' size. I.E. on the edge of not being able to run a microwave when the batteries are being charged.

The best fit, in my opinion, is a 3000 watt or larger genny. I would buy the Champion 3400 with remote electric start in a flash. They are priced to sell, and if my Yamaha dies that is what I will purchase.

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