Friday, May 12, 2017

Re: [Electric Boats] Leaving AGM batteries

 

If you have no load when you are away, I would get a small solar panel.
2 watt or so.

I have a dump trailer with a deep cycle battery.
I have connected a 2w coleman solar panel and it slowly keeps my battery charged.

It has no charge controller connected, but the output is low enough to charge the battery without overcharging it.

I have also used one connected to the cigarette lighter of a car I use very rarely.
It keeps the battery topped up too, even through the window.

--------------------------------------------
On Fri, 5/12/17, shredderf16 shredderf16@sbcglobal.net [electricboats] <electricboats@yahoogroups.com> wrote:

Subject: [Electric Boats] Leaving AGM batteries
To: electricboats@yahoogroups.com
Received: Friday, May 12, 2017, 4:41 PM


 









Sorry about no boat content but kind of
has to do with a "land boat". I'm building a
house on St Thomas and rigged a 360 watt solar system
feeding 2 105 amp hour 12 volt AGMs in parallel. Left for 2
months, came back to a fault light on my MPPT solar
controller and 11.2 volts in the bank. My guess is the
controller tripped shortly after I left and between the very
small power it and my Victron battery monitor use drained
down the batteries. Got the batteries back up now to 12.6
volts open circuit, but I have to leave now for another 2
months. Going to buy a Victron MPPT controller in the
interim, but am afraid to leave system powered again. I can
pull main breaker and disconnect batteries while I'm
gone, or take a chance old controller will trip again.
There's no AC power on site to trickle charge off of.
Any ideas on best course?Thanks,Jerry
Barth


Sent from my Sprint
Samsung Galaxy S7.









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