Parallax series 7300 converter question

[KATOOM]

I was wondering if anyone knew off the top of their head if the Parallax series 7300 convertor is a three stage unit? I have a family member with this converter and isnt sure if the trailer can remain plugged it during storage without harming the batteries. Thanks.

[Salvo]

14.4V is the threshold where gassing begins.
http://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery#Exploding_batteries

How often do those who have a PD need to add water? Perhaps once or twice a year? When on, the PD holds 14.4V for 2 hours. That's a long duration for a cell to lose few ounces of water.

RJsfishin wrote:
Quote:
Anyways, at 14.4V the battery degasses very little. It would take a long time for a battery that's initially full to drop electrolyte well below the plates.
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If you really believe such a thing, it would be much better if you kept it to yourself.

[Bobbo]

Salvo wrote:
Look at the numbers.

Battery boiling voltage is 14.4V at 25C.

Voltage reduces by 30mV/C.

You were at 100F, or 38C.

Boiling voltage is reduced by (38 - 25C) * 0.03/C = 0.39V.

At 100F, battery boiling voltage is 14.01V.

The Parallax converter is operating at 13.7V, way below the boiling voltage.

There are a few possibilities. The converter was defective or your story isn't straight.

Anyways, at 14.4V the battery degasses very little. It would take a long time for a battery that's initially full to drop electrolyte well below the plates.

Fancy numbers and equations don't conceal the fact that this post is 100% wrong.

[RJsfishin]

Quote:
Anyways, at 14.4V the battery degasses very little. It would take a long time for a battery that's initially full to drop electrolyte well below the plates.
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If you really believe such a thing, it would be much better if you kept it to yourself.

[JiminDenver]

Might be worth turning it on and checking it out even though the chance we will see a power pole is pretty slim. First off we would have to go to a campground and well honestly, that isn't going to happen. lol

[09FLSTC]

I'd get a multi stage upgrade kit for it.

[Salvo]

Look at the numbers.

Battery boiling voltage is 14.4V at 25C.

Voltage reduces by 30mV/C.

You were at 100F, or 38C.

Boiling voltage is reduced by (38 - 25C) * 0.03/C = 0.39V.

At 100F, battery boiling voltage is 14.01V.

The Parallax converter is operating at 13.7V, way below the boiling voltage.

There are a few possibilities. The converter was defective or your story isn't straight.

Anyways, at 14.4V the battery degasses very little. It would take a long time for a battery that's initially full to drop electrolyte well below the plates.

[JiminDenver]

Ok so what did I do wrong. It had its water before and there are no adjustments, what "maintenance" did I miss out on here?

[Salvo]

Probably millions single stage converters were sold. Were batteries boiling within 2 weeks? Hell no. Only those who didn't know battery maintenance boiled batteries and then blamed the converter.

I had the 7345 for 4 years before switching to Iota. I have to add 3 times more water now than with the Parallax.

It's easier on the ego to blame the converter than to admit one screwed up.

[Bobbo]

Salvo wrote:
This converter gets a bad reputation from the ineptitude of the noob.

I knew a guy from Florida who used the Parallex converter with G24 batteries for 6 years without problems. He was always plugged-in. He knew battery maintenance.

JiminDenver wrote:
Mine almost cooked my new battery in a few weeks our first trip out.

This demonstrates that if you want to be constantly fiddling with the batteries, the 7345 will work. If you would rather not be constantly fiddling with the batteries, the 7345 will damage the batteries more quickly than most.

[JiminDenver]

Salvo wrote:
This converter gets a bad reputation from the ineptitude of the noob.

I knew a guy from Florida who used the Parallex converter with G24 batteries for 6 years without problems. He was always plugged-in. He knew battery maintenance.

JiminDenver wrote:
Mine almost cooked my new battery in a few weeks our first trip out.

had I waited to check the water 2 or three times a year as you suggested earlier, I would not be using that same battery to run the trailer this year. I checked the water during the PDI two days before the trip just to make sure they did their job but in this case I would think the 99 degree temps was a factor. Luckily the noob knew well enough to check when he brought it home for charging.

[Salvo]

This converter gets a bad reputation from the ineptitude of the noob.

I knew a guy from Florida who used the Parallex converter with G24 batteries for 6 years without problems. He was always plugged-in. He knew battery maintenance.

JiminDenver wrote:
Mine almost cooked my new battery in a few weeks our first trip out.

[wa8yxm]

KATOOM wrote:
I was wondering if anyone knew off the top of their head if the Parallax series 7300 convertor is a three stage unit? I have a family member with this converter and isnt sure if the trailer can remain plugged it during storage without harming the batteries. Thanks.

7300 is single stage
7300T(For Timer)is a Timed 2 stage

Progressive Dyanmics Intella Power 4600 upgrades them (Replaces only the converter module) best converters.

[BFL13]

JiminDenver wrote:
Mine almost cooked my new battery in a few weeks our first trip out.

Mine works well for floating and for when on shore power, but it ruined my "learner" first set of batteries (pair of 6s) by not being able to get their SG's up into the "green" so they got sulphated.

I discovered Vector chargers and joined this forum but it was too late for those 6s 😞 I got a few more years out of them, but they died young. RIP, Learner Set.

[JiminDenver]

Mine almost cooked my new battery in a few weeks our first trip out.

[Salvo]

The batteries will "cook" quicker with an aggressive 3-stage converter (or solar charge controller) than the Parallex. It's up to the user to add battery water. The batteries will be fine if water is added 2 or 3 times a year.

KATOOM wrote:
Thank you. But really if its a signal stage, wouldn't it eventually cook the batteries in a few weeks or so no matter the weather? I guess I'm confused.