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Old 06-11-2016, 10:25 AM   #29
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1958 22' Flying Cloud
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We just bought a 59 Flying Cloud with no battery system so are installing one and would like to use lithium batteries, probably 400 AH, and are also trying to figure out where to buy them. AM Solar seems to be completely sold out. Since we are building the system from scratch, is there any advantage to using the "drop in " batteries sold by Smart and Stark versus the more cellular looking ones sold by EPS? We are also installing solar cells and are having a repair shop do the installation. Any thoughts appreciated as we are new to all of this! Thanks
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Old 06-11-2016, 08:03 PM   #30
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Originally Posted by Driftin Di View Post
We just bought a 59 Flying Cloud with no battery system so are installing one and would like to use lithium batteries, probably 400 AH, and are also trying to figure out where to buy them. AM Solar seems to be completely sold out. Since we are building the system from scratch, is there any advantage to using the "drop in " batteries sold by Smart and Stark versus the more cellular looking ones sold by EPS? We are also installing solar cells and are having a repair shop do the installation. Any thoughts appreciated as we are new to all of this! Thanks

The new Victron lithiums are 'on the water' and the first lot is expected in 2-3 weeks. These are a premium cell with an excellent monitoring system including a low temperature cut-off.

Maybe worth the wait??


Lew Farber
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Master Tech Energy Systems, Inc.
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Lifeline AGM Batteries**Magnum Inverters***Victron Energy Components
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Old 07-26-2016, 07:36 PM   #31
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Lithium batteries – where to buy?

UPDATE!!!

Our next Victron lithium shipment is on the way via motor freight. We expect delivery on or about Aug. 2.
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Old 09-05-2016, 12:03 AM   #32
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Lithium charge voltage

Lithium Iron Phosphate in theory are 3.65 volts per cell and fully charges a 4 cell pack is 14.6 volts.

I have used the Calb cells for a year now charging a 100 amp/hour 4 cell pack at that voltage.
I just had a cell go bad, but they are in an aluminum box in my tow vehicle and it has been over 100 degrees this summer.

The big challenge with the Calb cells is cell balancing which I critical with lithium batteries.
I have these micro boards that go across the cells to balance them, all feed back to a control board. Then a custom fabricated aluminum battery box, grommets, 400 amp breaker, etc. A lot of work for a 14.6 volt/100 aH pack.

I have also used a Battery Tender lithium battery which has the cell balancer built in, an easier to manage package.

I think we will see more Lithium Iron Phosphate batteries come to market in the next year or two.

The chargers in this industry are relatively basic when it comes to lithium.

I fly carbon fiber model planes as a hobby and use lithium cobalt batteries in those, like a Tesla.
They are charged to 4.20 volts per cell, much higher energy density than Lithium Iron Phosphate, and much higher discharge rates. My charger made in the UK balances during charging to 0.01 volts per cell.

Some have fabricated their own battery packs using that technology which is the Panasonic 18650 battery.

I have yet to see an RV fully powered by 18650 batteries. The challenge, they can get hot and catch on fire. In high performance model planes we discharge at 50-100C. The key to a Tesla is the cell management and cooling technology to enhance reliability.

I have talked with Progressive Dynamics about their charge board and it is set up for a 14.6 volt lithium pack.

I now want to run a 48 volt pack which is actually 16 cells of 3.65 volts or 58.4 volts fully charged.

I bought a Outback Power Flex Max 80 so I can program each phase of the charge cycle to .1 volts.

Dan






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Originally Posted by lewster View Post
The PD-9100L charges the LiPo batteries at 14.6VDC……………..much higher than the 14.2 VDC that 'we' (AM Solar) have found top be optimal after extensive testing of a variety of different cells. . No mention of the 'float or 'silent' voltage after that batteries are fully charged either. That might be one of the advantages of being 'took expensive'……as anything we sell or use has been through the ringer, literally and figuratively! Just be careful out there and remember…..YTOU GET WHAT YOU PAY FOR!!!!!

They also might have tailored these units to the requirements of the 2 lithium battery sources that they list on their web site: Stark Power and Relion.

And just for clarification, the "Master Tech" that PD refers to in the same sectarian is not me, but Master Techs, Inc, a wholesale supplier of electronic equipment for the RV industry in Marshall, MI.
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