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Naio

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Posted: 03/06/18 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

It never got 24 hours. Maybe 1 hour total, in bits and pieces. Lotta dial twiddling and grabs for the off switch each time it got to 30 amps.

I was actually encouraged that it got to 6 volts, but I am quite ignorant...


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MEXICOWANDERER

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Posted: 03/06/18 08:44pm Link  |  Quote  |  Print  |  Notify Moderator

I followed the confusing twiddles and grabs and came up for air and read it differently...[emoticon]

Allow it to charge but halt charging if it exceeds 30 amps

OR

You can set voltage limit back to 13.2

Charge until amperage reads 20 or less

Tweak voltage back up to 14.4 then charge until amperage drops to 1.0 or less.

You have to periodically check battery temp with your hand. Stop if one or more cells gets quite warm to the hand.

Naio

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Posted: 03/06/18 10:58pm Link  |  Quote  |  Print  |  Notify Moderator

Glad to hear there may still be hope!

But how low a voltage can the MW put out?


This battery won't take 13v.


Even with the MW at 12.36v, amps still kept going up albeit more slowly, about 1a per 30 seconds or so.

So I got in maybe 5 mins of charging before it hit 30 amps. But that 5 mins took me up to 6v [emoticon].

I am not sure if the Megawatt goes much lower?

Also I gotta do this on a dry day, as there is no roof [emoticon] and I have to sit there staring at the ammeter.

* This post was edited 03/06/18 11:16pm by Naio *

time2roll

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Posted: 03/06/18 11:23pm Link  |  Quote  |  Print  |  Notify Moderator

Megawatt does not seem like a good solution if it does not self limit the amps at the max rating. Or are you adjusting the voltage while connected? Set at just 1 volt over the battery voltage. Increase 1 volt when amps are steady or dropping.

Do you have a different charger or some jumper cables? Standard converter would be better. If you can jump the battery to get the automatic charger started I think you could leave it charge overnight in a safe place.


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Naio

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Posted: 03/06/18 11:27pm Link  |  Quote  |  Print  |  Notify Moderator

My smart charger wouldn't recognise the battery at 1v, altho now that it is up to 6v I could try again.

You think jumper cables and a running engine? Lord knows this battery would leap at the chance to gorge on 100 amps, but I am not sure it wouldn't eat itself to death.

Naio

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Posted: 03/06/18 11:30pm Link  |  Quote  |  Print  |  Notify Moderator

On the low amp end, I have 3 dashboard solar trickle chargers I could put on it.

I know AGM's don't usually like a trickle charge, but I'm wondering if that might be ok in this situation? They put out about 14.45 volts, I think.

Naio

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Posted: 03/07/18 12:15am Link  |  Quote  |  Print  |  Notify Moderator

Googling, I see the mw can go as low as 10 volts. I could try that [emoticon]

MEXICOWANDERER

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Posted: 03/07/18 12:22am Link  |  Quote  |  Print  |  Notify Moderator

turn anticlockwise do not force plastic screw

MEXICOWANDERER

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Posted: 03/07/18 12:23am Link  |  Quote  |  Print  |  Notify Moderator

turn anticlockwise do not force plastic screw

Naio

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Posted: 03/07/18 12:27am Link  |  Quote  |  Print  |  Notify Moderator

Ok. Is the solar trickle charge an ok option, too?

As for the jumper cables, I do not think I know anyone with a big enough rig to turn over my big van engine. Am not at an rv park.

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