Hi Steve,
Your AGM batteries will need bulk charging voltage above 175V (according to your previous post), if you change to Lithiums, the peak charging voltage will be above 180V. The important part of the change will be getting the correct charging profile into your charge controller.
Given that most 200W+ panels operate at less than 30V (24V nominal), you'll definately need an MPPT controller to raise the voltage to something that your traction bank can use.
If you're running multiple sources to into the charge controller simultaneously, you'll want them to be pretty close in voltage. On the buss bar, the sources are essentially in parallel, the voltage stays the same and the amps add together. If you had a 48V generator and two 24V panels in series, I believe that you could run them both into the MPPT controller at the same time, but you probably want to check with the controller company about that. Your regen is probably coming back at taction pack voltage, so I don't believe that it needs the controller to multiply it.
Fair winds,
Eric
--- In electricboats@yahoogroups.com, "Steve D" <sdolan@...> wrote:
>
> Solar power isn't something I know a whole lot about so I hope some can fill me in on a couple qustions and concerns. I'm planning on doing an install next year
> System:
> 144v Propulsion Pack at 210AH
> 12v House bank at 640AH fed from the Propulsion bank (144v to 12v)
> I want to add 2 maybe 3 210w solar panels on the davits. I of course would like to go to both the House and Propulsion banks once one or the other is fully charged and then anything still being generated at the solar panels is available to go to house "on" items. As far as I can tell I'd have to step up the output at the panels to 144v and go directly to the Propulsion bank then feed off it as usual however I haven't been able to find anything that would step the voltages up to 144v. Does this sound like the way to go? I don't think I can get panels up to that voltage but then I haven't checked either.
> I have buss bars already to except the Regen and Genset power. If the above is correct would the MPPT controller get wired at this point?
> Forget about it being 144v, but a general systems question. So you are sailing along running the toaster oven and notice it's got the batteries down to 50%. Your regenerating a few Amps and the solars are also generating a few and then you kick on the Honda (output is 48v). Your getting 3 points of power at 48v each going to the same buss bar and then to the batteries. What voltage is going to the batteries? My Mind says to multiply the voltages by 3 (series?) but that can't be right. Kind of brain dead on this rainy day.
> Is there anything different running solar to AGM's vs. LiFePO4's? I don't want to do this twice.
>
> Thanks in advance and Happy Holidays,
>
> Steve in Solomons MD
> Lagoon 410 SE
>
No comments:
Post a Comment