There is no ground because there is no frame. Most of if not all of the solar panels with over 19% efficiency use Solarpower cells, but you only need to worry about positive grounding when using high voltage long strings. For the amount of panels you could put on even the largest personal water craft, you can treat them just like normal panels.
In the case of all the bendable panels, they are not grounded at all.
On Jun 9, 2014, at 11:20 PM, "Carter Quillen twowheelinguy@yahoo.com [electricboats]" <electricboats@yahoogroups.com> wrote:
Does that Grape solar panel have a positive ground? and how does that work exactly?Looks just like the Renology panel, 100W Monocrystalline Bendable Solar Panel | Renogy Store, which I believe has a positive ground. Not sure exactly how to deal with that but would like to understand what difference it makes before I spend $2/watt for a couple of them for my dinhy. Only weights 3 pounds and looks like a good package but the positive ground thing has me concerned.Can anyone explain how this will affect a charging system? or does it matter?Captain CarterOn Monday, June 9, 2014 9:30 PM, "James Sizemore yamez4u@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
As long as the high and low cutoff can be user configured they would work. You would also want a contact relay so that the BMS could shut the charger down if a single cell went out of range. The 12 volt and 48 volt chargers are using the same feed in source so the limit is the watts used not the DC amps.120v 15a breaker can supply 1800 watts.1800 watts / 48 volt = 37.5 amps1800 watt / 12 volt = 150 ampsThe limit is almost always the source watts, just Ohm's law in action.The largest charger you can realistically buy is a forklift battery charger:You would need at least a 5000w generator to keep it feed.
On Jun 9, 2014, at 12:11 PM, "albert682@yahoo.com [electricboats]" <electricboats@yahoogroups.com> wrote:Hi Group,
I'm kicking myself for even shipping the 48v Lester chargers up to Canada but done is done. Can they even be used for charging Lithium Batteries? If not I'll use them for the coach RV batteries.
Otherwise I've been reviewing inverter/chargers and have found that 12v inverter/chargers output more amps than 48v inverter/chargers. Why is that? Also if that is the case should I be looking at a 12v high output charger?
Each of my motors produces 80amps for a combined output of 160amps full throttle. It would be nice to source out the components so that I can always return the same 160amps back to the bank. So if I'm thinking correctly then I get a large stand alone inverter and run multiple 48v chargers back into the system.
Everyone seems to go for the elcon 1500 charger but at the outset I don't know for sure if it charges at more than 20amps which would take forever to charge a large bank.
The safe limp home speed well it's more like the never going home speed I'm after. I do concurr though the DC generator is the way to go but prohibitively expensive. So AC generator(s) and a large output charger is what I'm after.
Arden
Posted by: James Sizemore <james@deny.org>
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