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Old 08-18-2014, 12:08 AM   #41
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Quote:
Originally Posted by gbaglo View Post
Was just on Canadian Tire site looking at their 27 deep cycle, on sale for $299.
Problem is they rate it 88 amp/h but don't indicate if that's the 5hr. rate, or 20 or what? Makes it hard to compare. Trojan is 105 AH at 20hr. rate and 85AH at 5hr. rate.
Given the price, it appears that you're looking at Canadian Tire's Group 27 AGM battery. The specs include:
Quote:
88 amp hours, 190 minute reserve capacity
"Reserve capacity" usually means the time that a 25-amp load can be maintained. That would be about 79 amp-hours over a 3-hour period. The 88 amp-hour rating would be over a longer period... but how long?

The corresponding Trojan is their 27-AGM. Comparing to the Trojan specs, the Canadian Tire battery is heavier (more lead), and has a greater reserve capacity... I suspect that the Canadian Tire 88 A-h rating is for a 5-hour rate; 20-hour rate would be likely be over 100 A-h if the ratings follow a similar pattern.

It looks like the Trojan you're using for comparison is the 27TMX. It has (in addition to the 85Ah@5hr and 105Ah@20hr) a reserve capacity of 175 min @25A. Again, it's lighter than the Canadian Tire unit... so again I suspect the Canadian Tire 88Ah rating is for 5 hour, and the 20 hour rating is likely over 105 Ah.
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Old 08-18-2014, 12:19 AM   #42
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Brian,

You have correctly ID'd the batteries I was comparing. Also need to look at warranty. I'm an electrical short circuit, but I'm guessing the Canadian Tire offering is the better deal?
It's on sale now, but I'm hoping I can limp along for a bit. Maybe get a new battery next spring.
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Old 08-18-2014, 12:45 AM   #43
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Have you looked at the vmaxtanks AGM batteries? They sell one with 125ah and 155ah. Better charge acceptance vs flooded.

Amazon.com: Vmaxtanks VMAX SLR155 AGM 12v 155ah Deep Cycle SLA Rechargeable Battery for Solar and Golf, Pv Solar Panels, Smart chargers, Wind Turbine and Inverters.: Electronics
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Old 08-18-2014, 01:02 AM   #44
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Free shipping. But, not to Canada methinks.
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Old 08-18-2014, 01:56 AM   #45
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Free shipping. But, not to Canada methinks.
Forgot about that. Looked at the Amazon.ca website and their choices are severely limited compared to the US site. I could ferry one up to ETI for you but it wouldn't be till March!
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Old 08-18-2014, 02:40 AM   #46
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Thanks for the offer, but if I get a battery locally, I won't have to mail it back to source to claim warranty. I still live in hope that I can get another season out of this Trojan 27TMX. I should, for the price.
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Old 08-18-2014, 09:56 AM   #47
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Quote:
Originally Posted by gbaglo View Post
Used the multi-meter and reads 12.5 or 6 ( eyes aren't what they used to be ) at the battery terminals.
I'm going to leave it unplugged from shore power for a few days and monitor it. Then I'll disconnect a terminal after charging and monitor that.
Don't disconnect 'a' terminal, disconnect the negative terminal, especially if the battery was just charged, and more so if it is in a closed space.

Wear eye protection and, if you insist on disconnecting the positive terminal, ear protection as well.

Good Luck.
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Old 08-18-2014, 10:51 AM   #48
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Quote:
Originally Posted by The Minimalist View Post
Don't disconnect 'a' terminal, disconnect the negative terminal, especially if the battery was just charged, and more so if it is in a closed space.

Wear eye protection and, if you insist on disconnecting the positive terminal, ear protection as well.

Good Luck.
What is the reason for taking all these precautions ?. Is explosion a possibility when you disconnect a positive terminal after the battery is full charged? Thanks.

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Old 08-18-2014, 11:06 AM   #49
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Old 08-18-2014, 11:39 AM   #50
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Quote:
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Free shipping. But, not to Canada methinks.
These may be available in Canada locally from Sears:
Sears.com (link to Sears Marine Deep Cycle Battery on sale).

I use a smaller version (size 34M) to power my electric trolling motor and have high praise for its easy charging, long life and foolproof maintenance, thanks to AGM construction.

If the twin 6V battery option was not available at ETI I would be considering a pair of these batteries in parallel. But at 75 pounds each, weight is a factor to consider since I can't lift much over 50 pounds.

A safety note: They don't give off external hydrogen gas in normal use.

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