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 > Replacing my Converter/Charger - Help

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Steve92004

Borrego Springs Ca

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Posted: 05/29/17 03:01pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Steve92004 wrote:

I got 14.4v from the charger and 14.2v at the battery.
Is that good enough voltage drop?
Good to go IMO.
I have seen a full volt differential and that is bad.

I still have one old #4 cable I want to replace and that might bump it up a bit

DrewE

Vermont

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Posted: 05/29/17 04:48pm Link  |  Quote  |  Print  |  Notify Moderator

Steve92004 wrote:

DrewE wrote:

Steve92004 wrote:

I got 14.4v from the charger and 14.2v at the battery.
Is that good enough voltage drop?


So a 0.2V drop...at what charge current?

That was bulk mode so 70 amps?
I don't know
It's now in regular mode 13.6 and I still have that.2v difference


Bulk mode (or any mode) would just max out at 70A or thereabout, in theory, before the converter's current limiting cuts the voltage down. In practice it's not quite that precise; often they're limited as much by power as by actively limiting the current.

If the batteries were nearly charged, the 14.4V or whatever your converter puts out could only put a few amperes of charge current through the battery. If they are discharged, it could be a whole lot more current. 0.2V drop at 5A isn't great, but at 40A it would be perfectly acceptable. (This is, of course, a practical application of Ohm's law.)





Steve92004

Borrego Springs Ca

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Posted: 05/29/17 05:08pm Link  |  Quote  |  Print  |  Notify Moderator

They were discharged, I still don't know

BFL13

Victoria, BC

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Posted: 05/29/17 06:38pm Link  |  Quote  |  Print  |  Notify Moderator

You need an ammeter to really know what is going on.

However, you do know your 6s want 14.8 volts at 77F for proper charging , so your 14.2 or even if you get it to 14.4 no loss, is going to be a limiting factor in how long the 6s last (Although not necessarily a big deal budget wise in comparison between say 3 years and 5 years or whatever when you annualize the costs.)

In hot weather 14.8v equivalent is less in voltage amount, so if you keep camping where it is hotter than most if us could stand [emoticon] it might get closer to the specified amount temp comped, once you get closer to 14.4 at the batts at 77F by improving your R on the pos and neg paths (or at least one of the paths.)


1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI

MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 12/19/17 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

Amplitude + time

An extreme example. Batteries that are discharged to 30% of capacity then put on continuous power at 13.6 volts for an unlimited time, they will recover slowly and over a period of perhaps 12 recoveries using this formula, over 8-10 months time, become sulfated.

That's what they make the Megawatt and dial timers for. To chop the idiotic manufacturer's anti-lawsuit, anti-battery psychosis off at the roots. Even the 29 amp 350 watt unit would work.

But some people seem to be afraid of setting up a Megawatt or Meanwell. You can pinstripe a donkey but you ain'g gonna have a zebra.

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