Scott,
One of your videos didn't play and the other one, to my surprise, was of me from over 5 years ago. And that's more than just a little ironic too because I have been following this thread carefully lately as I have a 5 year old, 48V pack of 6V batteries with several batteries that seem to be using a bit more water lately. They are also in parallel with another pack that I added about two years ago. I do have disconnect switches on each pack and a selector switch so I can operate them separately and run off either one or both. I normally leave them ganged together and this has worked great since I added the second pack and overall the system operates extremely better with the two packs working together. However I have found that they are charging and discharging at a slightly different rate now when I check the two circuits with a clamp on amp meter while running and charging. The 5 year old pack are Trojan T-125s and the newer pack are T-105s.
I have two questions for James, or anyone else that wants to answer:
When you parallel two 48V packs together, can you put a large diode coming from each pack to a common bus and solve the problem of one pack discharging to the other if one grounds out?
Please elaborate more on symptoms to look for in a failing battery pack. What is considered out of balance, Is 0.1V to 0.2V difference between batteries enough to panic over?
Capt. Carter
www.shipofimagination.com
On Wednesday, June 7, 2017 9:30 PM, "James Lambden james@electroprop.com [electricboats]" <electricboats@yahoogroups.com> wrote:
Batteries in parallel get dangerous at the end of their life. So yes you can go out and have a good time for years, but then one day your batteries start gassing off hydrogen gas. They can gas off when charging or when discharging and yes they can blow up. It can be quite disconcerting to see your battery in pieces and acid all over the place. Might even wreck your mood that day.
Be careful, and monitor batteries for balance more near the end of their battery life, and replace the entire pack when the voltage gets spongy. If there is any abnormal warmth in the battery at all, or any anomaly in the performance, its time for a new pack.
this applies to all lead acid battery packs.
Safety First Always. We don't want carelessness to ruin years of good fun with electric boating.
James Lambden
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
On Jun 7, 2017, at 11:11 AM, smasterson2@gmail.com [electricboats] wrote:
Headed out boating today on this dangerous thing, just like I did dozens of times last year...
https://www.youtube.com/edit?o=U&video_id=BRqcp4Tzzrg
And tomorrow, I am headed out on this dangerous thing, just like I have for the last four years...
https://www.youtube.com/edit?o=U&video_id=JfkzrLlUhtg
Stay dangerous my friends.Scott Masterson
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Posted by: Carter Quillen <twowheelinguy@yahoo.com>
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